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动态 (3585)
Dummer. ゛☀
2017年07月11日
Dummer. ゛☀
Family - Onagraceae Stems - To +1m tall, erect, herbaceous, terete to 4-angled with rounded angles, sub-hollow, glabrous or with thin vertical lines of antrorse curled hairs, single from the base, widely branching in apical half, often reddish at nodes.
Leaves - Stem leaves opposite, short-petiolate. Petioles to 1cm long, with a few strigose hairs on the margins. Blades glabrous, lanceolate, serrate, with antrorse strigose hairs on the margins. Midrib and lateral veins impressed adaxially, expressed abaxially, to +/-10cm long, 2cm broad, typically rounded at the base. Inflorescence - Terminal bracteate panicles. Bracts foliaceous, reduced upward. Branches of inflorescence alternate, straight and antrorse-curled pubescent. Pedicels pubescent like the branches of inflorescence, to 3-4mm long in flower, elongating in fruit to 1cm long. Flowers - Petals 4, white to pinkish, 3-5mm long, 2-3mm broad, glabrous, 2-lobed at apex, obovate to elliptic, distinct. Stamens 8, 4 being longer than the others, alternating with the petals, erect. Filaments to 2mm long, white, glabrous. Anthers pink, .2-.3mm in diameter. Stigma capitate, 1mm long, pale yellow. Style 1.5mm long, thicker than the filaments, glabrous. Calyx 4-lobed. Calyx tube to 1mm long. Lobes to 2-3mm long, 1-1.5mm broad, acute to acuminate or apiculate, entire, pubescent (curled and straight) externally, glabrous internally. Calyx tube with a few hairs internally. Ovary inferior, 6-13mm long in flower, antrorse and straight pubescent, 1mm broad, 4-angled (the angles rounded). Ovules many. Fruits to 6cm long, 1.3mm broad. Seeds to 2mm long, .5mm broad, brown, comose. The hairs to 1cm long, whitish brown to cinnamon.
Flowering - July - October. Habitat - Wet ground. Origin - Native to U.S. Other info. - This species is common and can be found throughout Missouri. The plant is fairly easy to ID because of its habitat, opposite stem leaves and small whitish-pink flowers. Of the two species of Epilobium in Missouri, this species is much more frequent.
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Dummer. ゛☀
2017年07月11日
Dummer. ゛☀
Family - Cornaceae Stems - To +4m tall, erect, woody, single or multiple from the base. Twigs reddish-brown, terete, with many small malpighian hairs. New seasons growth green, with many malpighian hairs.
Leaves - Opposite, petiolate. Blades simple, oblong-elliptic to elliptic-ovate, entire, acuminate, to +10cm long, +/-5cm broad, slightly scabrous and dark green adaxially with strigose pubescence, soft and gray-green abaxially with erect pubescence.
Inflorescence - Axillary pedunculate corymbiform cyme on the new seasons growth, to +/-8cm broad. Peduncle to +/-4cm long, scabrous, with appressed whitish and reddish hairs. Pedicels .5 to 1.5mm long, appressed pubescent. Flowers - Corolla white, 4-lobed, to 8mm broad, glabrous internally, appressed pubescent externally. Corolla lobes subulate to lanceolate, 3-4mm long, -2mm broad, acute. Corolla tube 2mm long, greenish white. Stamens 4, alternating with the corolla lobes, exserted, erect to spreading. Filaments white, glabrous, 3-4mm long. Anthers yellow, 2mm long. Style 1, erect, 3mm long, white, glabrous, surrounded basally by a thick light-pinkish nectary. Stigma greenish, capitate. Ovary inferior, 2-locular, with 2 ovules. Placentation axile. Calyx lobes 4, minute, alternating with the corolla lobes, to .5mm long, triangular, appressed pubescent externally, glabrous internally.
Flowering - May - June. Habitat - Dry or rocky woods, thickets, limestone, glades, prairies, bluffs, wet ground along streams, fence rows, roadsides. Origin - Native to U.S. Other info. - This showy species of Dogwood can be found throughout Missouri and is quite common. The plant would make a good garden specimen as it requires no care once established. The bunches of white flowers are not that long persistent, however. C. drummondi is the most common species of Dogwood in the state and it can be identified in the field by its small white flowers, green twigs, scabrous adaxial leaf surfaces, and the erect pubescent abaxial surface of its leaves.
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Dummer. ゛☀
2017年07月11日
Dummer. ゛☀
Family - Asteraceae Stems - To +1.5m tall, erect, herbaceous, terete, simple below, branching in the apical 1/3, glabrescent below, tomentose above, green to tan.
Leaves - Opposite, sessile, decussate, often with a smaller pair of leaves in the axils of the larger main leaves, to +10cm long, to 2cm broad, lanceolate to oblong-lanceolate to linear-lanceolate, coarse serrate in the apical 1/2 (at least on the lower leaves), green on both surfaces, with antrorsely bent pubescence, much more pubescent abaxially, with 3 main veins arising at the very base of the leaf blade. Other veins of the leaves anastomosing before the margin of the blade. Margins antrorse ciliolate.
Inflorescence - Multiple flowerheads in a corymbose arrangement terminating the stem. Each division of the inflorescence subtended by a pair of reduced bracts. Bracts foliaceous. Involucre - 5mm long (tall), +/-2mm in diameter, cylindric. Outer phyllaries smaller than the inner. Inner phyllaries to 5mm long, 1.4mm broad, tomentose externally glabrous internally, with a scarious-white margin, with 3 darker green veins (use a lens to see), with a solid green apex, linear to oblanceolate, rounded at the apex. Disk flowers - Flowerheads with 4-7 flowers. Corolla white in the apical 1/2, green basally, 4mm long, glabrous internally and externally, expanded in the apical 1/2, 5-lobed. Lobes acute, 1mm long, .5mm broad at the base, erect to spreading. Stamens 5, adnate at the apex of the contracted portion of the corolla tube. Filaments white, glabrous, compressed, .7mm long. Anthers purplish, to 1.2mm long, connate around the style, partially exserted. Style glabrous, green basally, white apically, to +/-6mm long, bifurcate in the apical 3mm (the divisions erect). Achenes green in flower, 2-2.2mm long, glabrous, terete or 5-sided. Pappus of capillary bristles. Bristles antrorse barbellate, white, 4-5mm long. Receptacle naked. Flowering - August - October. Habitat - Prairies, glades, thickets, open rocky wood, waste ground, fallow fields. Origin - Native to U.S. Other info. - This species can be found throughout much of Missouri but is mostly absent in the southeastern corner of the state. This is a non-distinct plant and many would consider it a weed. "altissimum" means "tallest" but this is not the tallest species of the genus, there are many which generally exceed its height. The plant is not difficult to identify but it can be confused with the similar members of the genus. The tomentose stems, 3 main leaf veins, and rounded phyllaries help to identify it correctly. Plants growing in full sun are much more stout, have more leaves, and have bigger inflorescences than do plants growing in the shade or in wooded areas.
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Dummer. ゛☀
2017年07月11日
Dummer. ゛☀
Family - Lamiaceae Stems - From fibrous roots, to 3m tall, 4-angled, winged, glabrous or with sparse retrorse hairs on the angles, hollow, herbaceous, erect, branching (typically in the apical 1/2), single from the base.
Leaves - Opposite, petiolate, decussate. Petioles to +7cm long, with an adaxial groove, mostly glabrous but sparse pilose in the groove especially near the base of the blade. Blades ovate, to 11cm broad, 15cm long, crenate-serrate to serrate, rounded or subcordate at the base, acute, villous below, sparse pubescent above. Veins impressed adaxially, expressed abaxially.
Inflorescence - A terminal spike of closely clustered verticillasters. Spike to 20cm tall, 1.5cm in diameter, bracteate. Peduncle of spike densely pubescent. Each cyme of a verticillaster composed of +/-10 flowers. Flowers sessile. Bracts subtending the flowers equaling or shorter than the calyx. Flowers - Corolla whitish, bilabiate, puberulent externally and internally, to 1cm long. Upper lip single-lobed. Lobe notched at apex, 1.6mm long, 2.1mm broad. Lower lip 3-lobed. Lateral lobes reduced and rounded, -1mm long. Central lobe expanded, 2mm long, +3mm broad, with lateral appendages, cupped. Stamens 4, exserted, didynamous, adnate in the apical 1/3 of the corolla tube. Filaments white, glabrous above, sparse pubescent basally, to 6mm long. Anthers bi-lobed, yellow, to .9mm broad. Style exserted, glabrous, white, 1.1cm long. Stigma 2-lobed. Ovary 4-lobed, subtended by a nectariferous ring, -.9mm broad. Lobes glandular apically, pubescent. Calyx tubular, subequally 5-lobed, puberulent, 5mm long in flower, accrescent. Lobes acute, entire, to 1.7mm long. Fruit of 4 nutlets. Nutlets pubescent. Flowering - July - September. Habitat - Open woods, thickets, moist soils, railroads. Origin - Native to U.S. Other info. - This species is common throughout Missouri. It is considered weedy but is quite striking and should be cultivated more. The corollas on the plants I have seen are mostly white. Most of the literature gives the corollas as yellowish to green. White seems to be the predominate color although the flowers do fade to a yellowish color when old. Traditionally this species was used mixed with others and used to treat poison ivy. Agastache is in the mint family but lacks a characteristic mint fragrance. nepetoides means "looks like Nepeta", which is catnip, and the two plants are fairly similar.
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