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FOC | Family List | FOC Vol. 5 | Urticaceae

15. Gonostegia Turczaninow, Bull. Soc. Imp. Naturalistes Moscou. 19(2): 509. 1846.

糯米团属 nuo mi tuan shu

Chen Jiarui (陈家瑞 Chen Chia-jui); Ib Friis, C. Melanie Wilmot-Dear

Hyrtanandra Miquel; Memorialis Buchanan-Hamilton.

Herbs perennial or subshrubs, sometimes diffuse, without stinging hairs. Leaves opposite or sometimes alternate in upper stems; stipules often persistent, lateral, intrapetiolar, free; leaf blade 3(-5)-veined, margin entire; cystoliths punctiform. Inflorescences axillary, glomerules of male and female flowers or unisexual (plants monoecious or dioecious); bracts small, membranous. Male flowers subglobose, apex abruptly truncate; perianth (3 or)4 or 5, usually free, valvate, segments angled, transversely crested or villous; stamens as many as perianth lobes; filaments inflexed in bud; rudimentary ovary present. Female flowers: perianth tubular, often ovoid and beaked, constricted and 2-4-toothed at apex; staminodes absent. Ovary included; style present; stigma filiform, villous along 1 side, deciduous with style; ovule orthotropous. Achene enclosed by marcescent, always accrescent, and often longitudinally winged or ribbed perianth; pericarp often crustaceous, lustrous. 2n = 26.

About three species: tropics and subtropics of Asia and Australia; three species in China.

Some authorities include Gonostegia within Pouzolzia.

1 Leaves alternate in upper stem, becoming smaller and denser; female perianth tube 2(or 3)-winged.   1 G. pentandra
+ Leaves all opposite; female perianth tube 10-12-winged.   (2)
2 (1) Leaf blade narrowly lanceolate, rarely narrowly ovate or elliptic, (1.2-)3-10 × (0.7-)1.2-2.8 cm; male perianth lobes 5; herbs prostrate or suberect.   2 G. hirta
+ Leaf blade ovate, elliptic, rarely lanceolate, 0.4-3 × 0.2-0.8 cm; male perianth lobes (3 or)4; herbs ascending.   3 G. parvifolia

Lower Taxa


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