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FOC | Family List | FOC Vol. 19 | Acanthaceae | Thunbergia

2. Thunbergia coccinea Wallich, Tent. Fl. Napal. 1: 48. 1826.

红花山牵牛 hong hua shan qian niu

Hexacentris coccinea (Wallich) Nees.

Vines, woody. Stems 9-angled, subglabrous, pubescent at nodes. Petiole 2-7 cm, grooved; leaf blade broadly ovate, ovate, or lanceolate, 8-15 × 3.5-11 cm, both surfaces pubescent, palmately 3-5-veined, base rounded to cordate, margin undulate or remotely toothed, apex acuminate. Racemes axillary or terminal, to 35 cm, pendulous; peduncle 3-4 cm, pubescent; bracts lanceolate, abaxially pubescent, adaxially glabrous; bracteoles oblong, 2.2-2.6 × 1.1-1.5 cm, apex acute. Calyx ca. 2 mm, reduced to a minute rim. Corolla red; tube basally cylindric for 5-6 mm, throat 1.5-1.6 cm; lobes suborbicular, ca. 7 mm in diam. Staminal filaments 1.2-1.5 cm, glabrous but with a tuft of trichomes at base; anther thecae parallel, unequal with longer one ca. 5.5 mm and shorter one ca. 4.5 mm, spurred at base. Ovary glabrous; style glabrous, exserted; stigma 2-cleft. Capsule glabrous, basal part 1-1.2 × 1.5-2 cm, beak 1.5-2.3 cm. Seeds compressed, ovate in outline, verrucose. Fl. Sep-Jan, fr. Jan-May. 2n = 20.

Forested montane slopes; 800-1000 m. SE Xizang, Yunnan [Laos, Myanmar, Thailand].


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