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FOC | Family List | FOC Vol. 16 | Convolvulaceae | Tridynamia

1. Tridynamia megalantha (Merrill) Staples, Novon. 3: 201. 1993.

大花三翅藤 da hua san chi teng

Porana megalantha Merrill, Lingnan Sci. J. 14: 53, fig. 18. 1935; P. spectabilis Kurz var. megalantha (Merrill) F. C. How ex H. S. Kiu.

Climbers; indumentum whitish to yellowish. Stems glabrous; young parts tomentose. Petiole 1.2-4(-7) cm; leaf blade ovate, elliptic, or nearly circular, 7.8-15(-19.7) X 5-9.3(-12.5) cm, abaxially tomentose, adaxially subglabrous to tomentose, base cordate. Bracts ovate; bracteoles unequal. Pedicel 7-10 mm. Flowers 3-4.5(-5) cm. Sepals unequal, narrowly oblong to linear, flat; outer 3 sepals 7-8 mm, tomentose; inner 2 smaller. Fruiting calyx tan, oblong, tomentellous, coarsely reticulate; outer 3 sepals basally tightly clasping, thickened, distally flat, winglike, 5.5-7.5 X 1-1.8 cm; inner 2 smaller. Corolla white, broadly funnelform; limb 2.7-4.6 cm in diam., shallowly 5-lobed. Stamens unequal, 1.1-1.7 cm. Disc absent. Pistil included; ovary ovoid, glabrous. Style 1.7-1.8 cm, pilose basally. Fruit obovoid-ellipsoid, slender, ca. 10 X 6 mm, pilose. Seeds dark brown, 8-10 X 5-6 mm, wrinkled. Fl. year round with peaks in Jun-Aug and Nov-Dec, fr. year round with peaks in Jun-Aug and Jan-Mar.

Often on calcareous soils, roadsides, grassy savannas, forest margins, scrub, hillsides; 0-900 m. Guangdong, Guangxi, Hainan, Yunnan [NE India, Laos, Malaysia, Myanmar, Thailand, Vietnam]

The whole plant is used medicinally.


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