Ipomoea alba L.


Ipomoea alba L.

Convolvulaceae

Description:

Herbs annual or perennial, twining, usually glabrous, rarely puberulent. Stems to 10 m, terete, smooth or with soft prickles, sap milky. Petiole 5-20 cm; leaf blade ovate to ± circular in outline, 10-20 X 5-16 cm, base cordate, margin entire, angular to 3-lobed, apex acuminate, mucronulate. Inflorescences helicoid cymes, rarely dichasial, 1- to several flowered; peduncle stout, terete, 1-24 cm; bracts early deciduous, small. Pedicel 7-15 cm, clavate distally, enlarged in fruit. Flowers nocturnal, fragrant. Sepals elliptic to ovate, ± leathery, glabrous; outer 3 sepals 5-12 mm, apex with a stout spreading awn 4-9 mm; inner 2 sepals 7-15 mm, mucronate. Corolla white, with greenish bands, salverform; tube 7-12 cm, ca. 5 mm in diam.; limb 7-12 cm in diam., shallowly 5-undulate. Stamens exserted; filaments inserted in apical 1/2 of corolla tube, glabrous; anthers sagittate basally. Pistil exserted; ovary narrowly conical, glabrous. Stigma 2-lobed. Capsule ovoid, 2.5-3 cm, apiculate. Seeds white, brown, or black, ca. 10 7-8 mm, glabrous. 2n = 28*, 30*, 38*.
Location: Yelagiri, Tamil Nadu 635853, India

Comments

Post a Comment

Popular posts from this blog

Ipomoea asarifolia (Desr.) Roem. & Schult.

Image
 Convolvulaceae Stems herbaceous, decumbent and the tips, twining, rooting at the nodes, glabrous. Leaves alternate, rounded-cordate to subreniform, 4-8 cm long, basally cordate, apically rounded, glabrescent. Inflorescences of solitary flowers or in axillary or terminal simple or compound cymes, glabrous or puberulent. Flowers on pedicels 14-24 mm long. Sepals unequal, the outer 5-6 mm long, the inner 10-12 mm long, elliptic to ovate, coriaceous, rounded apically, mucronate, glabrous, verrucose. Corolla lavender to purple, rarely white, 6-8 cm long, funnelform. Fruits tardily dehiscent capsules, subglobose, 10-12 mm long, brown, glabrous; seeds brown to dark brown, 6-7 mm long, minutely gray-pubescent.
Read more

Ipomoea eriocarpa R. Br.

Image
Convolvulaceae Description Herbs annual, twining or prostrate, with ± retrorsely or spreading hispid axial parts. Stems 1-2 m. Petiole 1.5-6.5 cm; leaf blade lanceolate-ovate or oblong-ovate, 3-9 X 1.5-3.5 cm, base cordate, margin entire, apex long attenuate, sometimes acute, appressed hispid; lateral veins 6 or 7 pairs. Cymes axillary, sessile or nearly so, usually 1-3-flowered; bracts linear-lanceolate, 3-8 mm, abaxially pilose. Pedicel very short or absent. Sepals ovate, ± equal, 7-9 mm, abaxially densely hirsute, apex linear-acuminate; inner sepals slightly narrower. Corolla pink or purplish, rarely white, campanulate, 7-9 mm, midpetaline bands densely hirsute outside; limb triangular-lobed. Stamens included. Ovary hirsute, 2-loculed, 4-ovuled. Stigma capitate, 2-lobed. Capsule ± globose, 5-6 mm in diam., spreading hirsute, apiculate. Seeds gray-brown, 2.5-4 mm, glabrous, minutely reticulate. 2 n  = 30.
Read more