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Miss Chen
2018年04月24日
Miss Chen
古装剧《芈月传》不少剧情桥段引起观众吐槽。其中，嬴荡与葵姑被杀人蜂严重叮伤，危在旦夕，这时自带女主光环的芈月机智地发现了七叶一枝花，救了他们。然而现实中七叶一枝花也却是如此吗？一起来了解一下吧。 [图片]关于七叶一枝花： 七叶一枝花为百合科重楼属的植物。别名蚤休、蚩休，[1]重台根、整休，草河车，重台草，白甘遂，金线重楼，虫蒌，九道箍、鸳鸯虫，枝花头，螺丝七、海螺七，灯台七，白河车，螺陀三七，土三七，又名七叶莲。其特征是由一圈轮生的叶子中冒出一朵花，花的形状像极了它的叶子，它可以分成两个部分，外轮花及内轮花，外轮花与叶子很像，约有六片，而内轮花约有八片，七叶一枝花的叶序属轮生叶，片数有个体差异、从4片到14片都有，“七叶”只是名称。花的结构特别：叶心如轮状会开花，花萼为绿色，花瓣呈细丝带状。台湾早期用来治蛇毒与疮疡肿毒等症状。 七叶一枝花的形态特征： 植株高35-100厘米，无毛;根状茎粗厚，直径达1-2.5厘米，外面棕褐色，密生多数环节和许多须根。茎通常带紫红色，直径(0.8-)1-1.5厘米，基部有灰白色干膜质的鞘1-3枚。叶(5-)7-10枚，矩圆形、椭圆形或倒卵状披针形，长7-15厘米，宽2.5-5厘米，先端短尖或渐尖，基部圆形或宽楔形;叶柄明显，长2-6厘米，带紫红色。花梗长5-16(30)厘米;外轮花被片绿色，(3-)4-6枚，狭卵状披针形，长(3-)4.5-7厘米;内轮花被片狭条形，通常比外轮长;雄蕊8-12枚，花药短，长5-8毫米，与花丝近等长或稍长，药隔突出部分长0.5-1(-2)毫米;子房近球形，具稜，顶端具一盘状花柱基，花柱粗短，具(4-)5分枝。蒴果紫色，直径1.5-2.5厘米，3-6瓣裂开。种子多数，具鲜红色多浆汁的外种皮。花期4-7月，果期8-11月。< [图片]七叶一枝花的药用价值： 性味：苦、凉。小毒。 归经：归心经、肝经、肺经、胃经、大肠经。 功能：败毒抗癌、消肿止痛、清热定惊、镇咳平喘。 主治：清热解毒，消肿止痛，流行性乙型脑炎，胃痛，阑尾炎，淋巴结结核，扁桃体炎，腮腺炎，乳腺炎，毒蛇、毒虫咬伤，疮疡肿毒。治痈肿肺痨久咳、跌打损伤、蛇虫咬伤、淋巴结核、骨髓炎等症，是云南白药的主要成分之一。 七叶一枝花的栽培技术： 七叶一枝花对大气候和土壤类别的要求不严，但力求有生长发育的特殊小气候，选地最为重要。选择日照较短的背荫缓坡地或平地和质地疏松，保水性、透水性都比较强的夜潮地、灰泡土、腐殖土地种植最为理想。重楼根系不深，整地后，理成120～150厘米宽的墒，每亩施农家肥或森林腐殖质3000～5000千克，然后捞沟盖肥，翻锄l遍，使耕作层肥土均匀，整平整细待种。喜凉爽、阴湿环境。宜肥沃沙质壤土或腐植质壤土栽植。用种子和根状茎繁殖。种子繁殖，9、10月种子成熟时，随采随播，条播或撒播，覆土4～5分。培育2～3年春或深秋移植。根状茎繁殖，是于采收时，切下芽尖部3～5节，开沟栽种，行株距8×4寸。生长期间要及时除草松土和浇水。追肥可在第二年春季出苗后进行，以氮肥、磷肥为主。
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Miss Chen
2018年04月24日
Miss Chen
艾草是一种很神奇的植物，早在春秋战国之际，人们就已经用它来作为针灸的必要工序了。用针刺完穴道之后，再拿点燃的艾草熏，可以抗菌防感染。可见，就算是在遥远的古代，艾草也依旧是很重要的一味药材。 [图片]艾草的形态特征： 艾草是多年生草本或略成半灌木状植物，植株有浓烈香气。主根明显，略粗长，直径达1.5厘米，侧根多;常有横卧地下根状茎及营养枝。茎单生或少数，高80-150(-250)厘米，有明显纵棱，褐色或灰黄褐色，基部稍木质化，上部草质，并有少数短的分枝，枝长3-5厘米;茎、枝均被灰色蛛丝状柔毛。 艾草的栽培技术： 一、生产中主要以根茎分株进行无性繁殖，需要注意分株的时间。但也可用种子繁殖。一般进行种子繁殖在3月份播种，根茎繁殖在11月份进行。 二、肥料有要求。每年3月初在地越冬的根茎开始萌发，4月下旬采收第一茬，每公顷每茬采收鲜产品11250～15000千克，每年收获4～5茬。每采收一茬后都要施一定的追肥，追肥以腐熟的稀人畜粪为主，适当配以磷钾肥。生产中要保持土壤湿润。 三、施肥有讲究。播种前要施足底肥，一般每667米2施腐熟的农家肥4000千克，深耕与土壤充分拦匀，排后即浇一次充足的底水。 三、选址需谨慎。畦宽1.5米左右，畦面中间高两边低似“鱼背”型，以免积水，造成病害。 [图片]艾草的文化含义： 艾蒿具有特殊的馨香味，做成馨香枕头，还有安眠助睡解乏的功效。艾蒿叶熬汁，然后稀释兑水沐浴，可除身上长的小红疙瘩。此外还可以驱蚊蝇、灭菌消毒，预防疾病。艾蒿还用于针灸术的“灸”，“灸”就是拿艾草点燃之后去熏、烫穴道。用艾蒿泡脚有很多保健功效。因为它有着治病的功能，特别是在五月节这天乘着露水采到后，药效最好。.艾蒿还是一种食用植物，艾草可作“艾叶茶”、“艾叶汤”、“艾叶粥”、艾蒿馍馒、艾蒿糍粑糕、艾蒿肉丸等食谱，以增强人体对疾病的抵抗能力。 悬艾草：民谚说：“清明插柳，端午插艾。”每至端午节之际，人们把插艾和菖蒲作为重要内容之一。家家都洒扫庭除，以菖蒲、艾条插于门眉，悬于堂中以防蚊虫，“避邪却鬼。”并用菖蒲、艾叶、榴花、蒜头、龙船花，制成人形或虎形，称为艾人、艾虎;制成花环、佩饰，美丽芬芳，妇人争相佩戴，用以驱瘴。秆枯后的株体泡水熏蒸以达消毒止痒，产妇多用艾水洗澡或熏蒸。
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Miss Chen
2018年04月24日
Miss Chen
Description: This perennial plant is about 3-7' tall and usually unbranched, except near the inflorescence. The central stem is light green or purplish green, terete, and nearly glabrous to pubescent. The alternate leaves are densely to moderately distributed along the stem, spreading widely in all directions. These leaves are up to 9" long and 2½" across; they are narrowly ovate, lanceolate-oblong, or elliptic in shape, and their margins are serrated. The upper surface of each leaf is dark green and glabrous (or nearly so); the lower surface is a lighter shade of green and glabrous, sparsely pubescent, or somewhat hairy. The base of each leaf has a short petiole, or it is sessile. The central stem terminates in a flat-headed panicle of flowerheads spanning 6-16" across. The base of each flowerhead consists of a short cylinder of appressed floral bracts (phyllaries) in several series spanning about 5 mm. across; the floral bracts are dark green, purplish green, or brown, broadly ovate in shape, and often finely pubescent or ciliate along their margins. The apex of each flowerhead consists of 10-30 disk florets and no ray florets. The magenta corolla of each disk floret is tubular with 5 recurved narrow lobes, while the exerted style is bifurcated and strongly recurved. The branches of the panicle and peduncles of the flowerheads are usually finely short-pubescent. The blooming period occurs from late summer to early fall and lasts about 1–1½ months. There is no noticeable floral scent. Each disk floret is replaced by a small achene that is gray or brown and bullet-shaped; the apex of each achene has a small tuft of both short and long hair hairs (or bristles) that are pale purple to tawny. These achenes are distributed by the wind. The root system consists of short thick rhizomes with fibrous roots below. Small clumps of plants are produced from the rhizomes. [图片]Cultivation: The preference is full sun to light shade, moist to mesic conditions, and soil containing loam, clay-loam, silt-loam, or sandy loam. Plants growing in sunny areas require more moisture than those growing in the shade. Range & Habitat: The native Tall Ironweed is common in southern Illinois, while in the rest of the state it is occasional to absent (see Distribution Map). Habitats include open woodlands, woodland borders, thickets, areas along woodland paths, swamps, riverbottom prairies, seeps and springs, pastures, and abandoned fields. In woodlands, this plant requires occasional disturbance to prevent excessive shade from neighboring trees. Tall Ironweed is found in wooded areas to a greater extent than other Vernonia spp. (Ironweed species) in Illinois, but it also occurs in moist open areas. [图片]Faunal Associations: The nectar of the flowers attracts bee flies, butterflies, skippers, and various bees (primarily long-tongued bees). Some bees also collect pollen for their larvae. The caterpillars of various moths feed on Vernonia spp. (Ironweed species), particularly the pith of their stems and their roots. These species include Carmenta bassiformis (Eupatorium Borer Moth), Papaipema cerussata (Ironweed Borer Moth), Papaipema limpida (another Ironweed Borer Moth), Perigea xanthioides (Red Groundling), Polygrammodes flavidalis (Pyralid Moth sp.), and Polygrammodes langdonalis (Pyralid Moth sp.). Another insect, Aphis vernoniae (Ironweed Aphid), sucks juices from the upper stems and leaf undersides. Other insects feeders include the larvae of Asphondylia vernoniae (Ironweed Bud Midge) and Youngomyia podophyllae (Ironweed Blossum Midge), which form galls on the buds and flowerheads respectively. Both Oecanthus quadripunctatus (Four-Spotted Tree Cricket) and Conocephalus brevipennis (Short-winged Meadow Katydid) have been observed feeding on the flowerheads of Tall Ironweed (Gangwere, 1961). Because of the bitter foliage, mammalian herbivores shun Ironweed species as a food source. As a result, these plants can become more abundant in pastures over time. [图片]Photographic Location: The edge of a small woodland in Urbana, Illinois. Comments: Across its range, Tall Ironweed is a rather variable species. Different populations of plants can vary in the number of disk florets per flowerhead, the width of the leaves, and the hairiness of the stems and leaf undersides. Tall Ironweed also hybridizes with other Vernonia spp. (Ironweeds), especially Vernonia missurica (Missouri Ironweed). The latter hybrid is referred to as Vernonia × illinoensis (Illinois Ironweed). Illinois Ironweed typically has flowerheads with 30-35 disk florets and is more hairy than Tall Ironweed. Missouri Ironweed has flowerheads with 35-50 disk florets and it is more hairy than Tall Ironweed; both stems and leaf undersides of Missouri Ironweed are often white-woolly from the abundance of these hairs. Another species, Vernonia fasciculata (Smooth Ironweed), has about the same number of disk florets in its flowerheads as Tall Ironweed (less than 30), but it is usually smaller in size and its stems are hairless. Unlike Tall Ironweed, Smooth Ironweed often has dark dots on the underside of its hairless leaves. A scientific synonym of Tall Ironweed is Vernonia altissima.
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Miss Chen
2018年04月24日
Miss Chen
Description: This perennial plant is 3-8' tall and unbranched. The central stem is erect and unbranched, except near the apex where the inflorescence occurs. It is usually winged, with long white hairs between the ridges. On rare occasions, the central stem lacks wings. The alternate leaves are up to 10" long and 2½" across; they taper gradually to petiole-like bases. The leaves are elliptic or lanceolate in shape; their margins are smooth, slightly serrated, or sparsely dentate. The upper surface of the leaves is medium green or olive-green and its texture is rough. The lower surface of the leaves is light green with white hairs along the major veins. The upper stem terminates in a dome-shaped panicle of flowerheads. These flowerheads have a daisy-like structure and a ragged appearance. Each flowerhead is about 1-2" across, consisting of numerous disk florets that are surrounded by 2-10 yellow ray florets. The corollas of the disk florets are greenish yellow and tubular in shape; they are conspicuous because of their size, projecting outward from the center of each flowerhead like a pincushion with thick needles. The petaloid rays are yellow and oblong in shape; they usually extend downward and outward. The blooming period occurs from late summer to early fall, lasting about 1-1½ months. Sometimes the flowerheads have a mild fragrance. The achenes are oval-shaped, flattened, and winged; each one has two short slender awns at its apex. They are distributed to some extent by the wind. The root system produces long rhizomes, often causing the formation of vegetative colonies. Cultivation: The preference is full sun to light shade and moist to mesic conditions. Wingstem typically grows in fertile soil that is high in organic matter. The lower leaves may fall off the plant during hot dry weather. Foliar disease, such as powdery mildew, occasionally damage the leaves, particularly when a plant is under stress. [图片]Range & Habitat: The native Wingstem occurs occasionally in most counties of Illinois; it is a little less common in the southern and NW areas of the state (see Distribution Map). Habitats include moist prairies, moist meadows near rivers and woodlands, woodland openings, woodland borders, floodplain forests, areas adjacent to woodland paths, thickets, savannas, partially shaded seeps, partially shaded areas along rivers, pastures, abandoned fields, and roadside ditches. This plant usually doesn't wander far from woodland areas or bodies of water. The deciduous woodlands where this plant occurs often contain such moisture-loving trees as American Sycamore, American Elm, Hackberry, and Silver Maple. Wingstem competes well against other plants in both high quality and disturbed habitats. [图片]Faunal Associations: The flowers are visited primarily by long-tongued bees, especially bumblebees. Some short-tongued bees, butterflies, and skippers also visit the flowers; the long tubes of the disk florets make the nectar inaccessible to many insects with shorter tongues, such as flies and wasps. Several kinds of insects feed destructively on Wingstem and other Verbesina spp. Caterpillars of the butterfly Chlosyne nycteis (Silvery Checkerspot) feed on the foliage, while caterpillars of Basilodes pepita (Gold Moth) feed on the flowers and developing seeds The caterpillars of two Gracillariid moths, Cremastobombycia ignota and Cremastobombycia ambrosiaeella, are leaf-miners. Other insects that feed on Wingstem include the leaf beetle Brachypnoea clypealis, larvae of the gall flies Cecidomyia verbesinae and Neolasioptera verbesinae, the aphid Uroleucon rurale, and Acrosternum hilaris (Green Stink Bug). Because of the bitterness of its leaves, Wingstem isn't consumed by deer, rabbits, and other herbivores to the same extent as many other plants. Animals may distribute the awned seeds to some extent. Photographic Location: The photographs were taken at Judge Webber Park in Urbana, Illinois. [图片]Comments: Sometimes this plant is called 'Yellow Ironweed' because of its fancied resemblance to Ironweed (Vernonia spp.). Both kinds of plants bloom at about the same time of year, share a similar height, have similar leaves, and like moist conditions. Their composite flowers, however, are dramatically different from each other in appearance. Also, Wingstem usually has a winged central stem, while Ironweed doesn't. The other species in this genus that can be found in Illinois, Verbesina helianthoides (Yellow Crownbeard), is usually found in moist to mesic prairies. This latter species is a shorter, hairier plant that blooms earlier in the summer; the ray florets of its compound flowers droop less, or they are held horizontally. In the past, Wingstem was assigned to the Actinomeris genus.
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Miss Chen
2018年04月24日
Miss Chen
Description: This wildflower is an annual, biennial, or short-lived perennial about 3-6' tall; it branches occasionally in the upper half. The central stem is light green, stout, 4-angled, and densely covered with long spreading hairs. Along its length are pairs of opposite leaves up to 6" long and 2¼" across; they are lanceolate to ovate and coarsely serrated along their margins. The upper surface of each leaf is medium to dark green, shiny, hairless to slightly hairy, and wrinkled along the veins; its lower surface is light green and more hairy. The petioles of the leaves are up to 2" long. The central stem terminates in a panicle of floral spikes up to 2' long and half as much across; the upper side stems also terminate in such panicles, although they are smaller in size. Each panicle has narrow ascending branches (up to 6" long) and an airy appearance; sessile small flowers are sparsely distributed along each of these branches. Each flower is 1/8" (3 mm.) across, consisting of a white corolla with 5 rounded lobes and a tubular green calyx with 5 lanceolate teeth. The blooming period occurs from mid-summer to early fall and lasts about 1½ months. Only a few flowers bloom at the same time. Each flower is replaced by 4 nutlets that are oblongoid and flattened. This wildflower reproduces by reseeding itself. Cultivation: The preference is partial sun, moist to mesic conditions, and a fertile loam, clay-loam, or silt-loam. This wildflower can be started from seed, but it is short-lived. Range & Habitat: The native White Vervain occurs in every county of Illinois and it is quite common (see Distribution Map). Habitats include open disturbed woodlands, woodland borders, thickets, powerline clearances in wooded areas, semi-shaded areas along paths, damp meadows along streams, gravelly seeps, and abandoned fields. White Vervain is usually found in habitats with a history of disturbance. It is somewhat weedy, but rarely forms colonies, existing primarily as scattered individual plants. [图片]Faunal Associations: The nectar and pollen of the flowers attract long-tongued bees (honeybees, bumblebees, Little Carpenter bees, Cuckoo bees, Digger bees, & Large Leaf-Cutting bees), short-tongued bees (Halictid bees, & Dagger bees, including Calliopsis verbenae), various flies (Syrphid flies, Bee flies, Thick-Headed flies, & Tachinid flies), small butterflies, and wasps. These insects cross-pollinate the flowers. Insects that feed on the foliage and other parts of White Vervain and other Verbena spp. (Vervains) include the larvae of Crambodes talidiformis (Verbena Moth), Longitarsus suspectus (Flea Beetle sp.), larvae of Clinodiplosis verbenae (Vervain Leaf Midge), Macrosiphum verbenae (Verbena Aphid), and Melanoplus bivittatus (Two-striped Grasshopper). The seeds are eaten occasionally by various granivorous songbirds, including the Slate-Colored Junco, Field Sparrow, Song Sparrow, Swamp Sparrow, Tree Sparrow, and White-Crowned Sparrow. In contrast, the bitter coarse foliage is rarely used as a food source by White-Tailed Deer and other mammalian herbivores. Photographic Location: Along a path in Busey Woods at Urbana, Illinois. Comments: Considering the large size of this plant, its flowers are remarkably small. The lanky branches of the inflorescence are rather long, however, and they sprawl in different directions. This makes the inflorescence difficult to photograph in its entirety. The scientific name of this plant refers to the resemblance of its leaves to those of Urtica spp. (nettles). White Vervain resembles two of its relatives, Verbena hastata (Blue Vervain) and Verbena officinalis (European Vervain). Blue Vervain has more narrow leaves and its flowers are conspicuously blue, rather than bright white. It is found in sunny wetland habitats more often than White Vervain. European Vervain has small flowers that are white or lavender. It differs from White Vervain primarily by its pinnatifid leaves, which have cleft lobes.
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Miss Chen
2018年04月24日
Miss Chen
Description: This is a deciduous shrub about ½-3' tall that branches occasionally. Young branches are initially green, but they later become yellowish green and more or less covered with small warty dots. Young branches are usually glabrous, but sometimes they are slightly pubescent. Older branches become woody and vary in color from red to yellowish brown; on the trunk and very old branches, the bark becomes shredded. Alternate leaves occur along new branches. The blades of these leaves are ¾-2¼" long and ½-1" across; they are oval, ovate, obovate, or broadly elliptic in shape, and their margins are smooth or minutely toothed toward the tips of the blades. The upper surface of the leaf blades is medium green or yellowish green and glabrous (sometimes with reddish tints in bright sunlight), while the lower surface is pale green, glabrous, and sometimes glaucous. Less often, the lower surface of the leaf blades may be slightly pubescent. The petioles are short and slender. Raceme-like clusters of flowers develop from second-year branches. The pedicels of the flowers are light green and glabrous. Each flower (up to 1/3" or 8 mm. in length) is longer than it is wide, consisting of a tubular corolla with 5 tiny recurved lobes, a short light green calyx with 5 broad teeth, 10 inserted stamens, and a pistil with a single style. The corolla is somewhat constricted toward its outer rim and its exterior is greenish white, pink-tinted cream, or red. The blooming period occurs from late spring to early summer and lasts about 3 weeks. The flowers are replaced by globoid berries about ¼" across that are initially green, but they later become dark blue with a whitish bloom. The berries become mature during mid- to late summer; they are juicy and sweet, containing 8-20 tiny seeds that are less than 1.5 mm. in length. The woody root system is branched and shallow, forming underground runners that can produce clonal offsets. At favorable sites, colonies of clonal plants are often formed. The leaves become red to dark red during the autumn before they fall to the ground. [图片]Cultivation: The preference is partial sun, mesic to dry conditions, and an acidic soil containing sandy or rocky material. Range & Habitat: Hillside Blueberry is occasional in northern Illinois, southern Illinois, and sandy areas along the Illinois River in central Illinois. Elsewhere in the state, it is rare or absent (see Distribution Map). Habitats include upland rocky forests, thinly wooded bluffs and rocky hillsides, sandy forests and sandy savannas, openings in sandy forests, sandstone cliffs and glades, sandy roadside embankments, sandy ditches, and abandoned sandy fields. Hillside Blueberry is often found in fire-adapted habitats because it is able to resprout from its underground runners. Dominant trees in these habitats are either oaks or pines. [图片]Faunal Associations: The flowers are cross-pollinated by honeybees, bumblebees, and Andrenid bees. These bees suck nectar from the flowers and, to a lesser extent, collect pollen. Various insects eat the leaves and other parts of blueberries (Vaccinium spp.). These species include the caterpillars of the butterflies Callophrys henrici (Henry's Elfin), Callophrys augustinus (Brown Elfin), and Colias interior (Pink-Edged Sulfur). The caterpillars of Hemaris gracilis (Graceful Clearwing), Sphinx canadensis (Canadian Sphinx), and other moths also use blueberry shrubs as a food source (see Moth Table). Other insect feeders include Oberea myops (Rhododendron Stem Borer), Melanoplus fasciatus (Huckleberry Spur-Throated Grasshopper), Altica sylvia (Blueberry Flea Beetle), Neochlamisus cribripennis (Blueberry Case Beetle), Tricholochmaea vaccinii (Blueberry Leaf Beetle), Dasineura cyanococci (Gall Fly sp.), Dasineura oxycoccana (Blueberry Gall Midge), Rhagoletis mendax (Blueberry Maggot Fruit Fly), Mesoleucanium nigrofasciatum (Terrapin Scale), Illinoia azaleae (Aphid sp.), and Clastoptera saintcyri (Heath Spittlebug). The species Acalitus vaccinii (Blueberry Bud Mite) forms galls on the flower buds. The edible berries are eaten by many upland gamebirds and songbirds (see Bird Table). Mammals that eat the berries include the Black Bear, Gray Fox, Red Fox, Striped Skunk, Opossum, Red Squirrel, Gray Squirrel, Fox Squirrel, Eastern Chipmunk, White-Footed Mouse, Woodland Deer Mouse, and Jumping Mouse. The berries are also eaten by Terrapene carolina (Eastern Box Turtle) and Clemmys insculpta (Wood Turtle). The leaves and twigs of blueberries are occasionally browsed by White-Tailed Deer and the Cottontail Rabbit. Colonies of Hillside Blueberry and other low-bush blueberries provide cover for many small animals in upland areas. [图片]Comments: There is some variability in the shape of leaves, the hairiness of leaves and young stems, and the color of the flowers. As a result, different varieties of Hillside Blueberry have been described by some authors. In areas where their ranges overlap, this species is capable of hybridizing with the similar Vaccinium angustifolium (Northern Low-Bush Blueberry). This latter species tends to have more slender leaves than Hillside Blueberry, and they are usually more serrated along their margins. While the lower leaf surface of Hillside Blueberry is lighter (pale green) than the upper leaf surface, the lower and upper leaf surfaces of Northern Low-Bush Blueberry are about the same color (medium green). An obsolete scientific name of Hillside Blueberry is Vaccinium vacillans. Other common names of this species are Early Low-Bush Blueberry and Blue Ridge Blueberry.
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Miss Chen
2018年04月24日
Miss Chen
Description: This small deciduous shrub is ½-2' tall with spreading leafy branches. The trunk and branches of older shrubs are often woody with shredded bark, while young shoots and twigs are green to brownish red, terete, and finely warty. Sometimes the twigs and shoots are slightly short-pubescent. Alternate leaves along the twigs and shoots are ¾-1½" long and about ¼-¾" across; they are elliptic in shape and very finely serrated along their margins. Both the upper and lower surfaces of the leaves are medium to dark green and glabrous (or nearly so). The short petioles are up to 1/8" (3 mm.) in length. [图片]Small clusters of nodding flowers develop from the preceding year's twigs. Each flower is about ¼" long and a little less across, consisting of a short green calyx with 5 teeth, a short-tubular corolla that is white or pinkish white, 10 inserted stamens, and an inferior ovary with a single style. The corolla is slightly indented along its upper rim, where 5 tiny lobes occur that are recurved. The peduncle and pedicels of the clustered flowers are light green to reddish brown and glabrous. The blooming period occurs from late spring to early summer for about 3 weeks. Afterwards, fertile flowers are replaced by globoid berries up to 1/3" (8 mm.) across that become dark blue with a whitish bloom at maturity. At this time, the fleshy interior of each berry is juicy and sweet and it typically contains 10-15 tiny seeds. The root system is usually shallow and spreading, although a taproot may develop on an older shrub. Vegetative colonies are produced from underground runners. The deciduous leaves often become red or burgundy during the the autumn. Cultivation: The preference is full sun to light shade, mesic to dry conditions, and an acidic soil that is sandy. Cross-pollination between genetically distinct shrubs increases the production of fruit. This shrub may fail to produce flowers and fruit in areas that are too shady. Close-up of TwigRange & Habitat: The native Lowbush Blueberry is occasional in NE Illinois (see Distribution Map). Habitats include sand prairies, shrub prairies, sandy savannas, sandy woodlands, rocky upland woodlands, rocky bluffs, sand dunes along Lake Michigan, and bogs. Lowbush Blueberry is sometimes the dominant understory shrub in some of these habitats, especially when they are sandy. This shrub becomes more abundant in response to occasional wildfires and the openings that such wildfires create. Faunal Associations: The flowers are cross-pollinated primarily by various bees, including Andrenid bees (Andrena spp.), bumblebees, and honeybees. Both nectar and pollen are available as floral rewards. The pollen is released from the anthers in response to the "buzz pollination" of the bees (high frequency vibration of the thoracic muscles). In addition to these floral visitors, many insects feed on the foliage, stems, and other parts of blueberry shrubs. For example, the larvae of two beetles, Oberea myops (Rhododendron Stem Borer) and Oberea tripunctata (Dogwood Twig Borer), bore through the twigs of these shrubs, while the larvae of two flies, Dasineura cyanococci and Dasineura oxycoccum (Blueberry Gall Midge), form galls on the buds or developing flowers. Other insect feeders include the leaf beetles Altica sylvia and Tricholochmea vaccinii, the larvae of Rhagoletis mendax (Blueberry Fruit Fly), Clastoptera saintcyri (Heath Spittlebug), Limotettix vaccinii (Blunt-Nosed Leafhopper), and Mesolecanium nigrofasciatum (Terrapin Scale). The caterpillars of two butterflies, Callophrys augustinus (Brown Elfin) and Callophrys henrici (Henry's Elfin), feed on the flowers and developing fruits of blueberry shrubs. In addition to these insects, the caterpillars of such moths as Hemaris gracilis (Slender Clearwing), Sympistis dentata (Blueberry Cinder), and Xestia dilucida (Reddish Heath Dart) also feed on these shrubs (see the Moth Table for a more complete listing of these species). Blueberries fruits are an important source of food to many vertebrate animals. These species include the terrestrial turtles, Clemmys insculpta (Wood Turtle) and Terrapene carolina (Eastern Box Turtle); such birds as the Ruffed Grouse, Wild Turkey, Blue Jay, American Robin, Yellow-Breasted Chat, Wood Thrush, and Eastern Bluebird (see the Bird Table for a more complete listing of species); and such mammals as the Black Bear, Red Fox, Raccoon, Striped Skunk, Opossum, Red Squirrel, Eastern Chipmunk, Jumping Mouse, Deer Mouse, and White-Footed Mouse. In addition to the fruits, the White-Tailed Deer and Cottontail Rabbit also browse on the foliage and twigs. Because Lowbush Blueberry is a densely branched shrub that often forms large colonies, it provides significant protective cover for ground-nesting birds and other wildlife. [图片]Comments: Lowbush Blueberry (Vaccinium angustifolium) is one of the primary sources of commercial blueberries, particularly in the New England region of the United States. The flavor of the berries is sweet and mild. Because this shrub is somewhat variable across its range, different varieties have been described, although none of these are currently recognized in Illinois. Compared to the Hillside Blueberry (Vaccinium pallidum), Lowbush Blueberry has more narrow leaves and its leaf undersides are less pale. It differs from another species, Canada Blueberry (Vaccinium myrtilloides), by having leaf undersides that are glabrous, rather than pubescent. These species usually occupy drier habitats than the taller Highbush Blueberry (Vaccinium corymbosum); the latter is typically found in forested bogs and similar wet habitats.
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陈银生
2018年04月24日
陈银生
干闷了一个星期的栀子花焉了，怎么拯救。
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Miss Chen
2018年04月23日
Miss Chen
Description: This perennial plant is 3-7' tall and usually unbranched, although short stems may develop from the leaf axils. The central stem is light green and stout; it has several flat ridges that are separated by narrow channels. The central stem is sparsely covered with stiff white hairs of variable length; these hairs can penetrate the skin and sting. Along the central stem are pairs of opposite leaves that droop downward slightly. The leaf blades are up to 8" long and 2½" across; they are medium to dark green, lanceolate, and coarsely serrated. The base of each leaf blade is rounded or slightly cordate. The upper surface of each leaf blade is heavily veined and glabrous, while the lower surface has sparse stiff hairs that can also sting. The slender petioles of the leaves are up to 1" long. At the base of each petiole, there is a pair of stipules up to ½" long. Panicles of flowers develop from the axils of the middle to upper leaves. These panicles are much branched and droop downward; their pubescent branches are heavily covered with flowers. Slender Nettle is monoecious to slightly dioecious; some plants have male flowers entirely or predominantly, while other plants have female flowers entirely or predominately. The male flowers are 1/8" (3 mm.) across with 4 green sepals and 4 white stamens. The female flowers are 1/8" across with 4 green sepals; the 2 inner sepals that enclose the ovary are larger in size than the 2 outer sepals. The sepals of both male and female flowers are pubescent; neither kind of flower has petals. The blooming period occurs during the summer and can last 1-2 months for a colony of plants. Pollination of the flowers is by wind. The brown seeds are 1.0–1.5 mm. long and irregular in shape. They can remain viable in the ground for 10 years. The root system is fibrous and rhizomatous. Clonal colonies are often produced from the long rhizomes. [图片]Cultivation: The preference is partial sun to light shade, moist to mesic conditions, and a fertile loamy soil. Most growth occurs during late spring and mid-summer. This plant can spread aggressively in favorable situations. The leaves are often attacked by insects. Range & Habitat: The native Slender Nettle is occasional to locally common in central and northern Illinois, while in the southern section of the state it is uncommon or absent (see Distribution Map). Habitats include disturbed open woodlands, floodplain woodlands, woodland borders, thickets, meadows in wooded areas, partially shaded seeps, fence rows, and moist waste areas. Areas with a history of disturbance are preferred. [图片]Faunal Associations: Caterpillars of the butterflies Vanessa atalanta (Red Admiral), Nymphalis milberti (Milbert's Tortoiseshell), Polygonia comma (Comma), and Polygonia interrogationis (Question Mark) feed on the foliage of Urtica spp. (nettles). Other insects that feed on nettles include leaf-mining larvae of the beetle Sumitrosis inaequalis, stem-boring larvae of the lizard beetle Acropteroxys gracilis, leaf-mining larvae of the midge Agromyza subnigripes, larvae of Dasineura urnicola (Nettle Urn Gall Midge), larvae of the moth Glyphipterix quadragintapunctata, and the leafhopper Empoasca vergena. The presence of stinging hairs in nettles provides some protection from the browsing of mammalian herbivores. Because Slender Nettle is relatively tall and often forms clonal colonies, it provides cover and protection for various insects, mammals, and birds. Photographic Location: The edge of a woodland in Urbana, Illinois. [图片]Comments: Slender Nettle is less heavily armed with stinging hairs than Urtica dioica (Stinging Nettle) and Laportea canadensis (Wood Nettle). Sometimes Slender Nettle is regarded as a variety of Stinging Nettle, in which case it is referred to as Urtica dioica gracilis. Stinging Nettle is adventive from Eurasia and has rarely naturalized in Illinois. It is shorter in stature and has wider leaves than Slender Nettle. The native Wood Nettle is similar in appearance to Stinging Nettle, except that it has alternate leaves. Unfortunately, these 3 species are often confused with each other. While many people dislike Urtica spp. (Nettles) and similar species because of their stinging hairs, they are important food plants to several species of butterflies. The young leaves of Nettles are edible if they are boiled in water and transformed into a creamy soup; they are supposed to be an excellent source of several vitamins and minerals.
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Miss Chen
2018年04月23日
Miss Chen
Description: This herbaceous perennial plant is up to 2½' tall and unbranched, except for 1 or 2 small side stems near the inflorescence. The central stem is round and glabrous, although scattered long hairs may occur where the leaves wrap around the stems, or a little below. The leaves are dark green or olive green, up to 12" long and 1" across, with parallel venation and smooth margins. They are linear to broadly linear, but wider at the base and narrowing to a pointed tip. They often bend downward toward the middle. [图片]At the apex of the central stem or side stems, is a small cluster of violet flowers. They often droop from their slender hairy pedicels. These are subtended by two leaf-like bracts that are up to 6" long and slightly more than ½" across. Each flower is about 1" across and has 3 rounded violet petals. Toward the center, there are 6 yellow stamens and spidery violet hairs. Each flower opens up during the morning and closes during the early afternoon on sunny days, but may remain open longer on cloudy days or when it remains in the shade. There is no floral scent. The blooming period occurs from late spring to mid-summer, and lasts about 1½ months. During this time, the flowers bloom sporadically, rather than all at once. The seed capsules split open into 3 parts, each releasing 3-6 oval to oblong, brown seeds. The seeds normally fall only a short distance from the mother plant. The root system is fleshy and fibrous, producing occasional offshoots nearby. Central Stem & Leaves Cultivation: The preference is partial sun and moist to mesic conditions. It also tolerates light shade, and full sun if the soil is sufficiently moist. Growth is best in fertile loamy soil, but some sand or gravel is acceptable. During droughts, the tips or outer lengths of the leaves may turn yellow or brown. This plant is easy to grow and rarely troubled by foliar disease. Range & Habitat: The native Virginia Spiderwort is fairly common in central and southern Illinois, while it is uncommon or absent in northern and extreme western Illinois (see Distribution Map). Habitats include moist to mesic black soil prairies, sand prairies, savannas, thickets, openings and edges of woodlands, sandstone cliffs, and powerline clearances through woodland areas. This plant usually doesn't stray far from areas with trees and shrubby vegetation. Faunal Associations: Bumblebees are the most important pollinators of the flowers. Other bee visitors include honeybees, Little Carpenter bees, and Halictine bees. Syrphid flies also visit the flowers, but they feed on stray pollen and are not effective pollinators. A leaf beetle (Lema collaris) feeds on the foliage. Various herbivores eat the leaves and stems of this plant occasionally, including deer, livestock, rabbits, and the wood tortoise. Photographic Location: The photographs were taken at Busey Woods in Urbana, Illinois. Comments: Virginia Spiderwort can be readily distinguished from Ohio Spiderwort by the hairiness of its slender pedicels. However, hybrid plants with Virginia Spiderwort as one of the parents can escape from cultivation; they may or may not have hairy pedicels. Virginia Spiderwort also has larger bracts subtending the flowers than Ohio Spiderwort, and it tends to be shorter with stouter leaves that don't have bluish tints. White flowers can be produced by plants in the wild, but this is very rare. Other color variations are available through market hybrids. The leaves and stems are supposed to be edible – fresh or cooked.
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