1. Megistostigma burmanicum (Kurz) Airy Shaw, Kew Bull. 23: 119. 1969.
缅甸大柱藤 mian dian da zhu teng
Tragia burmanica Kurz, J. Asiat. Soc. Bengal, Pt. 2, Nat. Hist. 42: 244. 1873.
Subshrubs, twining, 7-10 m tall, densely white puberulent when young, glabrescent, with stinging hairs. Stipules oblong, 2.5-3 mm; petiole 5-14 cm; leaf blade broadly cordate-ovate, 10-16 × 7-14 cm, membranous, abaxially sparsely appressed pubescent, with stinging hairs, adaxially glabrescent, base deeply cordate, margin sparsely denticulate or subentire, apex abruptly acuminate; lateral veins 4 or 5 pairs. Racemes 3-4 cm, densely white puberulent, with 1 female flower and 4-6 male flowers; bracts elliptic or ovate, 2-5 mm, margin pilose. Male flowers: calyx lobes 3, triangular-ovate, 2-3.5 mm, reddish; stamens ca. 1.3 mm. Female flowers: pedicel ca. 1 mm; sepals 6, oblong-lanceolate, 7-8[-9] mm, pubescent and with stinging hairs; ovary densely hirsute; styles connate into a subglobose to clavate column, narrowed and stalklike at base, 3-lobed at apex. Fruiting peduncle 2-3 cm; bract and bracteoles persistent; persistent sepals oblong-ovate, 1.5-2.5 cm; capsule ca. 2 cm in diam., setose. Seeds globose, 6-8 mm in diam., shortly papillose-tomentulose and white marbled. Fl. and fr. Oct-Dec.
Valleys, limestone rocks, forests, thickets; 700-1000 m. S Yunnan (Cangyuan, Mengla) [N Malaysia, Myanmar, Thailand].