Megistostigma yunnanense Croizat

Subshrubs, twining, 5-10 m tall, pubescent when young, glabrescent, with stinging hairs. Stipules triangular-lanceolate, 7-9 mm; petiole 3-15 cm; leaf blade ovate, elliptic, or cordate-ovate, 8-16 × 4-14 cm, membranous, abaxially pubescent along veins, adaxially sparsely appressed pubescent, base shallowly to deeply cordate, margin entire, apex abruptly acuminate; lateral veins 3 or 4 pairs. Racemes 5-7 cm, puberulent, peduncle 2-3 cm, with 1 female flower and 5-10 male flowers; bracts sublanceolate or ovate, 3-5 mm, pubescent. Male flowers: pedicel ca. 1 mm; calyx lobes 3, triangular, ca. 3 mm; stamen locules ca. 1 mm. Female flowers: pedicel ca. 1 mm; sepals 5, lanceolate-ovate, ca. 6 mm, pubescent; ovary densely white hirsute; styles connate into a clavate to subglobose column, narrowed at base, 3-lobed at apex. Fruit not known. Fl. Jun-Sep.

S Yunnan (Jinghong, Menghai).

● Forested slopes on limestone; 1000-1300 m.