Herbs annual; indumentum yellowish to silvery. Stems glabrescent. Petiole 2.9-7.7 cm; leaf blade deeply cordate, 6-16.7 ´ 3.3-9.4 cm, abaxially puberulent to tomentellous, adaxially strigose. Panicle 13-45 cm; lowermost bracts cordate, prominently veined in fruit; bracteoles 2, minute scales. Pedicel 4-7 mm. Sepals lanceolate-linear, equal, 1-2 mm, glabrous to silvery or golden pubescent abaxially. Fruiting calyx reflexed, tan to purplish; sepals spatulate to oblanceolate, flat or slightly concave, equal, 0.9-1.4(-1.8) cm ´ 2.5-4(-5) mm, puberulent or glabrous abaxially, glabrous adaxially, apex rounded-obtuse, apiculate. Corolla white, yellow in tube, funnelform, (7-)8-11 mm; limb (0.6-)0.8-1.2(-1.3) cm in diam., 5-parted. Stamens included, unequal, 1.5-2.5 mm; filaments pilose basally. Disc absent. Pistil included; ovary ovoid. Stigma ellipsoid to clavate, apex emarginate. Fruit tan, sometimes brown-purple striate, slenderly ellipsoid-obovoid, 5-7(-9) ´ 3-4(-5) mm, glabrous, apex acute or apiculate. Seed reddish to dark brown, ellipsoid-globose, 3-5 ´ 2.5-4 mm. Fl. summer-fall, fr. fall-winter. 2n = 28.
"Slender, herbaceous perennial twiners; stem appressed-pubescent when young, glabrous afterwards. Leaves alternate, 3-10 x 3-8 cm, ovate, acuminate, base cordate, pilose; petiole 2-5 cm long. Flowers in axillary racemes, often combined into a lax panicle; lower bracts leaf-like, with a semi-amplexicaul base; upper ones subulate; pedicels 0.3-0.6 cm long. Calyx-segments 0.15-0.25 cm long, linear-lanceolate, thinly hairy, enlarged in fruiting, up to 2 cm long. Corolla white, 0.8-1 cm long, glabrous, lobes 5, ovate, acute. Stamens included. Style well-developed; stigma shortly bilobed. Capsule 8 mm long, ovoid; seeds 6 mm long, oblong, reddish-brown, glabrous."
Wallich in Roxburgh, Fl. Ind., 2: 41. 1824; P. gagnepainiana
H. Léveillé; P. racemosa
C. Y. Wu; P. racemosa
C. Y. Wu.