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Miss Chen
2017年12月24日
Miss Chen
[图片]倒挂金钟又名灯笼海棠、吊钟海棠，是柳叶菜科倒挂金钟属植物。常绿灌木，小枝紫红色，叶绿色，花期4-6月，花生于叶腋，花梗长约5厘米，下垂，花型独特，似吊挂钟状，故名。倒挂金钟非常适合在家里阳台上，办公室内种植，由于花本身是一种药材，在其生长过程中可为居室提供净化空气，有效防止蚊虫逆生，是一种难得的家居花卉。 [图片]倒挂金钟叶子发黄：加强水分管理 浇水过多，盆土积水久湿，造成土中缺乏氧气，导致部分须根腐烂，因而吸水、吸 肥能力减弱，引起嫩叶变成淡黄色，花叶也相继逐渐变成暗黄色。所以说烂根是引起叶子发黄的原因之一。一旦发现植株叶子发黄，应立即控制浇水、停止施肥，并经常松土，使盆土透气良好。发病严重的，应该将植株脱盆将其置于干土堆中，使水分慢慢的渗出，待枝叶复原后重新栽种。 浇水过少，或长期浇半截水或漏浇，使叶片的水分蒸发大 于吸收，造成水分供不应求，也会引起叶片发黄。一旦发现叶片干瘪发黄，要立即将花盆移动阴凉处，及时向叶面喷些水，并浇少量的水。以后随着茎叶逐渐恢复挺拔，再逐渐增加浇水量。 倒挂金钟叶子发黄：控制施肥的量度 施肥过多，特别是施氮肥过多而又缺乏磷、钾肥时，容易引起叶片变黄，主要表现为新叶比较肥厚，叶面凹凸不平，老叶逐渐脱落，严重时夜间会逐渐干枯。甚至是整片都出现焦黄。遇到这种情况要立即停肥，增加浇水量，让肥料从排水孔流出，或者立即倒盆，去掉部分的陈土，换上新土，将植株重新栽种。 施肥不足，尤其是长期未施氮肥或未换盆土，土中氮素营养缺乏，导致枝叶瘦弱，叶薄而黄，此时需要及时倒盆，将植株脱盆，换上大一号的盆，装入新的疏松的土壤，将其重新栽种好。浇透水后放到半阴处，等其慢慢恢复之后，再正常养护。 倒挂金钟叶子发黄：土壤酸碱度影响 土壤偏碱：北方栽植喜酸性土的花卉，由于北方多数地区土壤含盐碱较多，养殖一段时间后土壤也会呈碱性，影响植株的生长。可有间隔地浇施0.2%硫酸亚铁液，同时相间浇施0.1%磷酸二氢钾液，改变土壤的酸碱度。 倒挂金钟叶子发黄：合理光照 倒挂金钟为喜阴花卉，放在阳光强射的位置的养护，很容易造成叶片嫩芽出现焦黄甚至整个叶片发黄的现象，发现后立即将植株移到通风良好处养护。但也不要完全遮阴，正午时分适当的遮阴就好。 倒挂金钟叶子发黄：控制湿度 湿度：北方天气干燥，加上冬季家中有暖气，空气更是干燥，在此种环境下，倒挂金钟很容易叶尖干枯，叶片上出现焦斑。应该经常用温水喷洗叶片，并在增加室内的空气湿度。叶尖可以在植株套一个塑料袋加湿，早上揭开。 倒挂金钟叶子发黄：防治病虫害 倒挂金钟很容易受到病虫害侵染，就会引起多种叶斑病，使叶片局部组织坏死，出现失绿黄斑或黄绿相嵌的斑驳，或整叶变黄脱落。或者受到虫害，叶绿素被破坏掉，也会出现黄白色的小斑点，导致叶片脱落。一旦发现病虫害，及时喷药防治。
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Miss Chen
2017年12月24日
Miss Chen
[图片]小仙女植物叶子呈浓绿色，富有金属光泽，叶脉为银白色，清晰可见，这样摆放于室内既显得典雅，又美观。除了在鉴赏方面外，小仙女植物养于室内，能通过光合作用将室内人呼出的二氧化碳转化为氧和有机物，保持室内的碳氧平衡。小仙女也能在室内进行蒸腾作用，散发出植物体内本身的水分，以此来增加空气的湿度，也能降低空气的湿度，形成气流。且小仙女植物能够吸收一些有毒气体，保护人体的安全。 [图片]叶片发黄的缘由 许多种植者之所以发愁，或许是因为根本不知道它们为什么会发黄，所以药不对症，这样自然不行。具体来说，导致这种现象主要有一下几个原因。 第一个是缺少营养元素。一般来说，植物缺少的是钙元素或是氮元素。 第二个是对植物浇水时没有合理进行。水过多或者水过少都会引起叶片发黄的现象。只不过，症状微微有些不同，仔细观察还是能看出来的。如果是水太多了，植物的嫩叶会变黄，而且没有光泽，但是老一些的叶子基本不会受到影响。但是，如果是缺水的话，老叶会从下到上开始枯黄以至于脱落，相反新叶就不会遭殃了。所以，如果是这种情况的话，一定要分清是缺水还是水多。 第三个就是光照不足造成的了。我们都知道，光照对于一个植物的成长是至关重要的。长期处于荫蔽的环境中，植物就没法进行光合，那么叶绿素就没法合成了。长期下去，植物的叶子怎么会不发黄呢？ 解决办法 如果是第一种原因，就得给植物补充适量的养料了。我们可以通过施加动物粪便、饼肥等等来补充氮元素；用氯化钙来补充钙元素。 针对第二种原因的两个方面，我们需要的就是科学合理地给植物浇水。总的原则就是，让盆土微湿，但是不要泡水就是了。 如果是最后一种原因，那就比较简单了，在晴朗的天气条件下经常把它拿出来见见阳光就好了。
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十七年华
2020年04月09日
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你好，请问小仙女竹芋和小仙女海芋是一种植物不同叫法或者其中一个是错误叫法么？还是两种植物只是长得像呀？因为淘宝买的时候以为买的竹芋 ，但是搜索好像都是海芋
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Miss Chen
2017年12月24日
Miss Chen
Description: This perennial plant is unbranched, except slightly near the inflorescence, and up to 3' tall. The central stem is stout and covered with spreading white hairs. The pinnate compound leaves are also covered with white hairs, and consist of 3-11 leaflets. They are located primarily at the base of the plant, although a few small compound leaves alternate along the central stem above. Each leaflet is up to 3" long and 2" across, with the leaflets becoming larger toward the tip of the compound leaf (away from the stem). A leaflet is coarsely serrated along the margins, pinnately veined, and has an ovate or oblong shape (with blunt tips). The entire plant appears light or whitish green. The inflorescence occurs as a tight cluster of the flowers at the apex of the plant, sometimes with smaller side clusters. A flower has 5 white petals, 5 light green sepals, 20 or more golden stamens, and a small golden reproductive structure in the center. It is about ¾" across and resembles the flower of a strawberry plant. There is no floral scent. The blooming period occurs during mid-summer and lasts about a month – only a few flowers are open at the same time. The small seeds are distributed to some extent by the wind. The root system consists of a central taproot, and there are rhizomes that help to spread the plant, although it is not particularly aggressive. Cultivation: The preference is full sun and mesic to dry conditions. This plant is not particular about soil type, as long as the site is well-drained. In native habitats, it's often found in soil that contains some clay, rocky material, or sand. Drought tolerance is excellent, and foliar disease is rarely observed. This plant is easy to grow if the above requirements are met. Range & Habitat: The native Prairie Cinquefoil occurs occasionally in the northern half of Illinois (see Distribution Map). Habitats include mesic to dry black soil prairies, clay prairies, sand prairies, gravel prairies, hill prairies, Black Oak savannas, and abandoned pastures. Unlike some of its weedy relatives, this plant is normally found in high quality habitats, rather than disturbed areas. [图片]Faunal Associations: The flowers are visited primarily by small bees and flies. This includes Little Carpenter bees, Halictine bees, Syrphid flies, Tachinid flies, Blow flies, and others. Wasps and small butterflies are less common visitors. The larvae of a Gall Wasp (Gonaspis sp.) forms galls on the stems. The leaves and stems are occasionally eaten by some mammalian herbivores, such as rabbits and livestock, but it is a minor food source. Photographic Location: The photographs were taken at Meadowbrook Park in Urbana, Illinois, and at a prairie of Parkland College in Champaign, Illinois. Comments: This rather ordinary-looking plant resembles Potentilla recta (Sulfur Cinquefoil), an introduced plant, in its erect habit and overall appearance. However, Prairie Cinquefoil has white or cream flowers and hairy pinnate leaves, while Sulfur Cinquefoil has light yellow flowers and less hairy palmate leaves. An older scientific name of Prairie Cinquefoil is Potentilla arguta. When ultra-blue light is made visible through a special filter, patterns are revealed in the flowers of many cinquefoils (Potentilla spp.) that are not apparent to the human eye, but perceptible by most pollinating insects. These ultra-violet reflecting patterns help the flowers stand out from the background, and may function as nectar guides. Thus, the flowers are colored a combination of either white or yellow with bee-blue.
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Miss Chen
2017年12月24日
Miss Chen
Description: This perennial plant consists of a basal rosette of leaves, from which emerges one or more stalks of flowers. The leaves are up to 6" long and 2½" across, and oblong or oblanceolate. They are greyish green or green with a prominent central vein and smooth margins. There are finer side veins that are pinnately arranged. The foliage and other parts of this plant are hairless. A green or red flowering stalk emerges from the rosette that is about 1½' tall, from which an umbel of about 6-40 flowers dangle downward. Each flower has 5 petals that are reflexed upward, converging at the base of the flower, which consists of a pointed yellowish tube with white and brown accents. The petals are white, light pink, or rosy pink. There is no floral scent. In overall appearance, the inflorescence looks like a collection of pretty shooting stars, hence the common name for this plant. The blooming period occurs during late spring and lasts about a month. The entire plant dies down when summer arrives, although the dried up stalks persist somewhat longer. The small dark seeds are contained in seed capsules that are held erect (unlike the flowers). They are somewhat cylindrical, but taper at the ends. Gusts of wind shake the stalks holding the seed capsules, and can carry the seeds several feet away. The root system is fibrous. Over time, offsets can slowly form. Cultivation: The preference is full or partial sun, and moist to slightly dry soil. Shooting Star can thrive on dry sunny slopes if there is sufficient rainfall during the spring because it dies down before summer droughts arrive. The soil can consist of loam with lots of organic material, or contain some rocky material. There is a preference for slopes, which reduces competition from taller plants. The foliage of mature plants dies down before disease can affect it. Shooting Star can be difficult to start from seed because of damping off, and it is slow to develop because of the short period of active growth. Transplants can also be temperamental, particularly if they are too small, or dug into the ground after the cool rainy weather of spring. Range & Habitat: The native Shooting Star occurs in the majority of counties in Illinois (see Distribution Map). This plant is occasional to locally common in high quality habitats, otherwise it is rare or absent. Habitats include moist to slightly dry black soil prairies, hill prairies, openings in rocky upland forests, limestone glades, bluffs along major rivers, fens, and abandoned fields. An occasional wildfire during the late summer or fall is beneficial because it reduces the dead vegetation that can smother this plant during the spring. Faunal Associations: Queen bumblebees are the most typical visitors of the oddly shaped flowers. They obtain pollen from the flowers by the rapid vibration of their thoracic muscles, which is sometimes called 'buzz pollination.' Other bees visiting the flowers are Anthophorine bees, Eucerine Miner bees, and Green Metallic bees. All of these insects collect pollen, as the flowers offer no nectar reward. The seeds are too small to be of much interest to birds. Mammalian herbivores may feed on the foliage during the spring, but little information is available about this. [图片]Photographic Location: The photographs of the flowers and the basal leaf were taken at a wildflower garden near Red Bison Railroad Prairie in Champaign, Illinois. Comments: This is one of the most beautiful spring wildflowers in the prairie. A colony of these plants in bloom is a sight not to be missed. The flowers of Shooting Star resemble in form those of Horse Nettle (Solanum carolinense) and other members of the Nightshade family. This is an example of convergent evolution between plants of different families because of similarities in the method of pollination. Early pioneers called this plant 'Prairie Pointers.'
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Miss Chen
2017年12月24日
Miss Chen
Description: This perennial wildflower consists of a low rosette of basal leaves and a flowering stalk of flowers about ½–1½' tall. The basal leaves are up to 6" long and 2½" across; they are ovate-oblong or obovate, medium green, hairless, and smooth along their margins. The erect flowering stalk is hairless and devoid of leaves; at its apex there is an umbel of 3-20 flowers. The flowers nod downward from their drooping pedicels. Each flower is about ¾" long, consisting of a corolla with 5 oblong lobes, a light green calyx with 5 triangular teeth, and 5 stamens that are appressed together around a single slender style. The corolla is usually rosy pink, although sometimes it is a lighter shade of pink. The lobes of the corolla are turned inside-out, fully exposing the reproductive organs (which are pointed downward). Near its base, the corolla has patches of yellow and white. The anthers of the stamens are yellowish orange. The blooming period occurs during the late spring for about 2 weeks. Afterwards, the pedicels of the flowers turn upward and the developing seed capsules are held erect. At maturity, the papery walls of the seed capsules become light brown. Each seed capsule contains many tiny seeds. The root system consists of a crown of fibrous roots. The foliage withers away by mid-summer. This wildflower reproduces by reseeding itself. Cultivation: The preference is full or partial sun during the period of vegetative growth and development. This occurs during the spring and it is quite rapid. At this time, ample moisture and cool to moderate temperatures are required. This wildflower can adapt to a loamy garden soil, but it often occurs on rocky slopes in its native habitat. Some protection from the hot afternoon sun is desirable, but not required if there is ample moisture. Range & Habitat: Amethyst Shooting Star is found in only a few counties in NW and west-central Illinois (see Distribution Map); it is native and uncommon. Habitats include thinly wooded bluffs, rocky cliffs, and sheltered areas of upland prairies where moisture tends to accumulate. In Illinois, this wildflower is found in hilly areas along the Illinois and Mississippi Rivers. In other states, it is often found in mountainous areas. Faunal Associations: The flowers are visited by bumblebees and other bees for their pollen. Through the rapid vibration of their abdominal muscles, bumblebee visitors engage in "buzz pollination," which induces the flower to release its pollen. The low foliage is probably edible to mammalian herbivores, but it is rarely eaten because of its inconspicuous and ephemeral nature. [图片]Photographic Location: The wildflower garden of the webmaster in Urbana, Illinois. Comments: This is a little jewel of a plant. It closely resembles the more common Dodecatheon meadia (Shooting Star), but the flowers of Amethyst Shooting Star are usually a deeper shade of pink. In general, Amethyst Shooting Star is slightly smaller in size than Shooting Star, and the flowering stalk of each plant has a tendency to produce fewer flowers (less than 20); sometimes, the flowering stalk of a robust Shooting Star produces substantially more than 20 flowers. The most critical difference between these two plants, however, consists of the characteristics of their seed capsules: At maturity, the seed capsules of Amethyst Shooting Star are light brown and thin-walled, while the seed capsules of Shooting Star are dark brown and thick-walled. The basal leaves of these two species are very similar.
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Miss Chen
2017年12月24日
Miss Chen
Description: This herbaceous plant is a summer annual that has stems about ½–1' long. These stems are usually erect or ascending, although sometimes they sprawl across the ground. The stems are unbranched or sparingly branched, light green to red, bluntly 4-angled (at least above), and short-pubescent (var. teres) to hairy (var. setifera). Pairs of opposite leaves occur along the entire length of each stem. These leaves are up to 1½" long and ¼" across; they are linear, linear-lanceolate, or linear-oblong in shape, entire (toothless) and involute (rolled downward) along their margins, and sessile with prominent central veins. The upper leaf surface is medium green and appressed short-pubescent to glabrous, while the lower leaf surface is slightly more pale and short-pubescent primarily along the central vein. The leaf bases along each stem are joined with merged stipules that form shallow cup-like structures. The exterior of these stipules is green to whitish green and sparsely short-pubescent to hairy. Along the upper rim of each pair of merged stipules, there are long erect bristles up to ½" long; these bristles are light green, white, or red. [图片]Either solitary or small clusters of 2-3 flowers are produced from the axils of the middle to upper leaves. Each flower is up to ¼" long, consisting of a tubular-funnelform corolla with 4 spreading lobes, 4 green sepals that are lanceolate in shape, 4 stamens with pale yellow to white anthers, and an inferior ovary with a single white style. The corolla is lilac, pink, or white; its exterior is often finely short-hairy. The sepals are sparsely short-pubescent to hairy; they are shorter than the corolla. The style has a knobby (capitate) tip. Both the stamens and style are included or only slightly exserted from the corolla. The blooming period occurs from mid-summer to early autumn, lasting about 1-2 months. There is no noticeable floral scent. Afterwards, the flowers are replaced by dry fruits (schizocarps) that are obovoid in shape with remnants of the persistent sepals at their apices. Immature fruits are green, while mature fruits are brown. These fruits are sparsely short-pubescent (var. teres) to hairy (var. setifera); their fine hairs are straight and ascending. Eventually, these fruits divide into 2 nutlets each. The nutlets are about 3Distribution Map mm. (1/8") long, half-obovoid in shape, brown, and more or less covered with persistent fine hairs. The root system consists of a slender taproot with secondary feeder roots. This plant often forms colonies by reseeding itself. Cultivation: The preference is full sun, dry conditions, and poor soil containing an abundance of sand, gravel, or compacted clay. This plant will also tolerate partial sun and moister conditions with fertile soil, in which case it will be displaced by taller plants eventually. Drought tolerance is quite good because of the long taproot. Range & Habitat: Rough Buttonweed occurs occasionally in the southern half of Illinois, where it is native, and a few counties in the northern half, where it is probably adventive. Illinois lies along the northern range limit of this species. Habitats include upland prairies where there is sparse vegetation, hill prairies, sand prairies, rocky glades, gravel bars along rivers, pathways with compacted soil, gravelly areas along roadsides, gravelly areas along railroads, and barren waste ground. Areas with a history of disturbance are preferred. Rough Buttonweed is regarded as a common weed in the southern states, but it is less ubiquitous in Illinois. Faunal Associations: Limited information is available about this plant's relationships to various fauna. The nectar and pollen of the flowers probably attract small bees and flower flies (Syrphidae). It has been reported by Tietz (1972) that caterpillars of the Tersa Sphinx (Xylophanes tersa) feed on Rough Buttonweed. This moth has a southern distribution, but it is a strong flyer that migrates to the northern states during the summer. Another insect that feeds on this plant is a flea beetle, Strabala rufa (Clark et al., 2004). This flea beetle has a brownish orange to red carapace. The Greater Prairie Chicken eats the seeds, and possibly other gamebirds feed on them as well. Photographic Location: The photographs were taken of plants growing on a little-used path with compacted soil. This path was located near an abandoned railroad in Champaign County, Illinois. Rather large colonies of Rough Buttonweed occurred in this area, primarily in sunny areas where Partridge Pea (Chamaecrista fasciculata) and Flowering Spurge (Euphorbia corollata) also occurred. The photographed plants are the less hairy variety of Rough Buttonweed, Diodia teres teres. Comments: Rough Buttonweed (Diodia teres) is not particularly showy and it is easily overlooked. This plant resembles some of the other buttonweeds (Diodia spp.), but it has more narrow leaves and it prefers to grow in drier, sunnier places. Compared to Smooth Buttonweed (Diodia virginica), Rough Buttonweed has shorter flowers, undivided styles, and corollas that are often lilac or pink. Smooth Buttonweed has white flowers with slender divided styles. Other common names of Diodia teres are 'Poorjoe' and 'Poverty Weed.' These are primarily southern names that refer to this plant's preference for poor soil. There are two varieties of Rough Buttonweed: the typical variety (var. teres) and a more hairy variety (var. setifera). This latter variety occurs in southern Illinois.
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Miss Chen
2017年12月24日
Miss Chen
Description: This perennial wildflower is 1½-3' tall, more or less erect, and either unbranched or sparingly so. The central stem is light green, terete, and hairy. Alternate trifoliate leaves occur along the entire length of this stem; they have short petioles (nearly sessile to ¼" in length) and leaflets that are 1-3" long and ¼-¾" across (at least 3 times longer than they are across). The leaflets are narrowly oblong to lanceolate-oblong and smooth along their margins; they are blunt at the tips and bases. The upper surface of the leaflets is dull green and sparsely covered with stiff appressed hairs, while the lower surface is pale green and hairy along the veins. At the base of each trifoliate leaf, there is a pair of small stipules that are linear-lanceolate; these soon wither away. The central stem (and any lateral stems) terminates in a narrow inflorescence about 6-12" long. This inflorescence is usually a simple raceme of flowers, although sometimes it is a sparingly branched panicle. The central stalk of thisRaceme inflorescence is light to medium green and hairy. Individual flowers are about ¼" across, consisting of 5 petals that are white, pink, or rose-pink, a short tubular calyx with 5 teeth, several stamens, and a pistil with a single style. The petals form an upper banner and 2 wings that enclose a keel; at the base of the banner, there is a patch of pale yellow. The hairy calyx varies from light green to purple. Each flower has a short slender pedicel up to ¼" long. The blooming period occurs during mid- to late summer and lasts about 3-4 weeks. Usually, only a few flowers are in bloom at the same time. There is no noticeable floral scent. The flowers are replaced by flattened seedpods called 'loments' that consist of 1-3 segments with convex upper and lower sides. The lower side of each segment is more convex that the upper side. The loments are pale green and covered with hooked hairs. The loments have a tendency to break apart into individual segments; each segment contains a single seed. The root system consists of a deep taproot. This wildflower spreads by reseeding itself. Cultivation: The preference is full sun, dry conditions, and sandy soil. However, this wildflower will tolerate partial sun and either loamy or rocky soil. The root system adds nitrogen to the soil via symbiotic bacteria. Range & Habitat: The native Sessile-Leaved Tick Trefoil is occasional in southern, west-central, and NE Illinois, while in the rest of the state it is rare or absent (see Distribution Map). Habitats include dry sand prairies and typical prairies, railroad prairies, dry sandy savannas and typical savannas, rocky open woodlands, limestone glades, and roadside embankments. Faunal Associations: The flowers are cross-pollinated primarily by long-tongued bees, which collect pollen. These floral visitors include bumblebees, leaf-cutting bees (Megachile spp.), long-horned bees (Melissodes spp.), alkali bees (Nomia spp.), and others. Some insects feed on the foliage, flowers, or seeds of Sessile-Leaved Tick Trefoil and other species of this genus. This includes the caterpillars of several skippers, specifically: Achalarus lyciades (Hoary Edge), Epargyreus clarus (Silver-Spotted Skipper), Thorybes bathyllus (Southern Cloudywing), and Thorybes pylades (Northern Cloudywing). Other insect feeders include caterpillars of the butterflies Everes comyntas (Eastern Tailed Blue) and Strymon melinus (Gray Hairstreak), caterpillars of the moths Hypena scabra (Green Cloverworm) and Grapholita fana (Chesire Cat Moth), leaf-mining larvae of the Buprestid beetles Pachyschelus confusus and Pachyschelus laevigatus, larvae of the seed weevil Apion decoloratum, the thrips Echinothrips americanus and Neohydatothrips desmodianus, and the aphid Microparsus variabilis. There are also several leaf beetles that feed on tick trefoil species, specifically: Anomoea laticlavia (Clay-colored Leaf Beetle), Bassareus lituratus, Cerotoma trifurcata (Bean Leaf Beetle), Colaspis brunnea (Grape Colaspis), Cryptocephalus insertus, Odontota dorsalis (Locust Leaf Miner), Pachybrachis nigricornis, Pachybrachis othonus, Phyllecthris dorsalis, and Saxinis omogera. [图片]Some vertebrate animals also feed on these plants. Both the Bobwhite Quail and Wild Turkey eat the seeds, while the White-Tailed Deer, Cottontail Rabbit, horses, cattle, and other mammalian herbivores readily consume the foliage. Because the hooked hairs of the loments can cling to clothing and fur, the seeds are distributed into new areas by humans and mammals. Photographic Location: The wildflower garden of the webmaster in Urbana, Illinois. Comments: Sessile-Leaved Tick Trefoil is one of the Desmodium spp. that is often found in prairies. It produces smaller and fewer flowers than another prairie species, Desmodium canadense (Showy Tick Trefoil). Sessile-Leaved Tick Trefoil can be distinguished from other species in this difficult genus by its more narrow leaflets (at least 3 times as long as across), very short petioles (¼" in length or less), and its narrow inflorescence (a simple raceme or sparingly branched panicle).
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2017年12月23日
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[图片]红花羊蹄甲是1880年在中国香港被首次发现，经当时港督亨利·阿瑟·卜力爵士（Henry Arthur Blake）和植物学家共同研究，确认为羊蹄甲属的新品种，并以卜力爵士的姓氏为之命名，原译为洋红花羊蹄甲。香港人称为“红花羊蹄甲花”，又因其属羊蹄甲属，叫它“红花羊蹄甲”或“紫花羊蹄甲”，而台湾则为其花大色艳，称“艳红花羊蹄甲”，至于它“香港兰花”的别称，则是从英文名'Hong Kong Orchid TrC直接翻译而来。 [图片]红花羊蹄甲叶子发黄的原因 水黄 新生出的芽稍顶心萎缩，嫩叶变成淡黄色，老叶也呈暗黄色，这是因为红花羊蹄甲盆内积水过多，长时间潮湿，土壤不能呼吸，缺少氧气，部分须根腐烂而导致的。 肥黄 新生叶片肥厚有光泽，但是叶面上凹凸不平，老叶逐渐发黄并且枯死，这是由于未能合理控制施肥量造成的。 早黄 红花羊蹄甲的顶心和新叶片都是正常生长的，植株下部和内膛的叶片却先干黄、脱落，这是因为长期浇水不当导致的，没有长期浇透水导致盆花脱水。 饿黄 红花羊蹄甲的生长需要符合其形态大小的生存空间，盆小苗大，肥水不足，盆内须根过于密集但是土壤很少，就会导致红花羊蹄甲的叶片变黄。 荫黄 红花羊蹄甲喜欢阳光充足的地方，所以如果经常把红花羊蹄甲盆栽放置在荫蔽的地方，叶片得不到光照，无法进行光合作用，叶片就会变薄、叶色变浅、发黄、脱落。 红花羊蹄甲叶子发黄怎么办 适当浇水 针对水黄、早黄的现象，需要控制浇水并且停止施肥，长期保持盆内湿润即可，除7月和8月视降水量确定是否浇水，4至10月各浇一次透水，入冬前浇防冻水。 夏季经常向叶面喷雾，也可以向周围环境喷雾，保持空气相对湿度。 合理施肥 针对肥黄的现象，需要立即停止施肥，适当多浇水，混合一下肥液。 可以向花盆内撒一些萝卜或者小白菜的种子，等到出苗后拔除，可以消耗掉花盆内多余的肥料。 及时换盆 针对饿黄的现象，需要及时给红花羊蹄甲更换大一点的花盆，把衰老枝、过密枝剪掉，防止养分流失。 增加光照 针对荫黄，应该给红花羊蹄甲增加光照强度，把盆栽放置在能够照射到阳光的地方，夏天不用荫蔽，冬季也要放置到朝南的向阳处。
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[图片]黄桷兰，又名黄兰(植物名实图考) 黄玉兰(广东)，黄缅桂(云南)是木兰科、含笑属的常绿乔木植物。黄桷兰枝干挺拔， 高达20米，分布在云南南部和西南部，在长江以南各省区均有栽培。喜生长子温暖地方。花和叶是芳香油原料，可提取浸膏;木材优良，可供造船。分布于印度、尼泊尔、缅甸、越南。中国西藏东南部、云南、福建、台湾、广东、海南、广西有栽培;长江流域各地盆栽，在温室越冬。 [图片]原因 叶子发黄有两大原因，一是施肥不当，二是浇水不当，当然还有一些其它的因素，但这两个是引起叶子泛黄最基本也是最重要的原因。 解决方法 施肥不当： 我们先来说一下施肥不当这个原因，黄桷兰是比较依赖肥料的，若长期施肥不足，就会导植物没有营养可吸收，叶子就会泛黄；但若肥料过于充足，则会伤害到它的根部，也会导致叶子泛黄。肥料的施放不当还会影响它的开花或是花期消失。所以日常施肥时一定要根据肥料的说明来合理配比。而且不要看到植物出现问题就认为是缺营养，从而盲目施肥。 浇水不当： 在养殖时，若叶子出现萎蔫的现象，那就证明缺水了，此时要及时浇水，放在植物放在半遮荫处进行养护，慢慢得就可恢复，但若此时不及时浇水，那时间一长叶子就会泛黄的。在浇水时也要掌握好浇水量，不可出现积水，这样会让土壤失去透气性，影响植物的健康，其叶子也会泛黄。夏季可以每天进行一次浇水，时间可以选择在傍晚十分进行，若第二天上午出现较干的情况，那可以适当的浇一些水。
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[图片]不夜城芦荟还有一个斑锦变异变种，称“不夜城锦”，叶面及叶背均有黄色或黄白色纵条纹，其条纹的宽窄因植株而异，有时整个叶子都呈黄色。其余特征与不夜城芦荟相同，经常做家用观赏植物。 [图片]不夜城叶子发黄的原因 浇水不当 水分的控制对不夜城的生长至关重要。浇水过多或浇水太少，都会对不夜城的生长产生不良影响。 浇水过多时，盆土长期过湿，根部积水，土中缺氧，致使部分须根腐烂，阻碍正常呼吸和吸收养分，引起叶片逐渐变黄脱落。 浇水太少时，会影响不夜城的养分吸收，使叶色暗淡无光泽，叶片萎蔫下垂。 施肥不当 肥料可以促进植物的生长。但要注意合理施肥。 不夜城不需要经常施肥，但要注意，不要长久脱肥，土中营养素缺乏，不夜城生长不良，容易叶子发黄。施肥过量则会导致不夜城生长不均衡，新叶肥厚，老叶焦黄。 病虫害 受到真菌等病菌侵害引起的病害和遭受害虫而产生的虫害，是植物健康的一大杀手。如不及时处理，会导致叶片变成局部枯黄及至整叶萎黄脱落。 冬季温度过低 不夜城喜欢温暖干燥的环境，低于零度便会受冻。冬季气温过低时，容易受到冻害，叶片发黄。 缺乏光照 不夜城喜欢阳光，若长期将其放置在蔽荫处或光照不足的地方，则会逐渐导致不夜城生命力减弱，叶薄而黄。 换盆不及时 随着植物的生长，它也会需要更大的生长空间。当不夜城长到一定规模，一定要及时换盆，否则会导致根部呼吸不畅，引起烂根，进而导致叶黄。 不夜城叶子发黄怎么办 做好水肥管理 做好水分控制，保持盆土微湿即可。注意不要出现积水，以免烂根导致整株坏死。 根据不夜城自身的生长状况决定是否施肥，可以薄施多肥。 做好养护 及时更换盆土，修剪根部。 按照季节的不同转换养护方法。夏季高温时注意遮阴，冬季气温低则要注意保暖，要注意通风。 做好病虫害的预防 经常检查不夜城的生长情况，及时发现病虫害，并进行治疗。
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