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FOC | Family List | FOC Vol. 5 | Urticaceae

21. Debregeasia Gaudichaud-Beaupré, Voy. Bonite, Bot., Atlas. 90. 1844.

水麻属 shui ma shu

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

Leucocnides Miquel; Missiessya Weddell; Morocarpus Siebold & Zuccarini (1846), not Boehmer (1760).

Shrubs or small trees, without stinging hairs. Leaves alternate, petiolate; stipules deciduous, intrapetiolar, connate, membranous, 2-cleft; leaf blade thinly papery or papery, 3-veined, often snow white or silvery tomentose abaxially, margin serrulate; cystoliths punctiform. Inflorescences axillary, densely capitate clusters of unisexual flowers (plants monoecious or dioecious); glomerules solitary or pairs of dichotomously branched cymes. Male flowers: perianth lobes (3 or)4(or 5), slightly connate, valvate, often depressed-globose in bud, stamens (3 or)4(or 5); filaments inflexed in bud; rudimentary ovary obovoid, woolly at base. Female flowers: perianth tube obovoid or jug-shaped, mouth contracted, very minutely 3- or 4-toothed, in fruit often enlarged, fleshy, and adnate to ovary, rarely membranous and free; staminodes absent; style short; stigma penicillate, with tuft of long hairs; ovule orthotropous. Achenes somewhat drupaceous, obovoid, slightly compressed, closely enclosed by often fleshy, adnate perianth. Seeds with endosperm; cotyledons small, broad.

About six species: mainly in tropics and subtropics of E Asia, one species in N Africa and one in E Australia; all six species in China.

The stem fibers are used to make ropes and fishing nets, and the fruits are edible and used to make wine.

1 Leaves broadly ovate, elliptic, or cordate; fruit enclosed by membranous perianth.   (2)
+ Leaves lanceolate, sometimes narrowly ovate or oblong; fruit enclosed by succulent perianth.   (4)
2 (1) Leaves usually elliptic; branches without leaf scars, spreading hirtellous.   1 D. elliptica
+ Leaves broadly ovate or cordate; branches with leaf scars, appressed pubescent.   (3)
3 (2) Branches with fleshy, scale-like protuberances or warts; inflorescences to 3 cm; leaf margin denticulate, secondary veins in 3-5 pairs.   2 D. squamata
+ Branches without protuberances or warts; inflorescences often more than 5 cm; leaf margin sinuate-dentate, secondary veins in 5-8 pairs.   3 D. wallichiana
4 (1) Branches spreading pubescent; at least some inflorescences on current year's branches; flowering August to December.   4 D. longifolia
+ Branches usually appressed pubescent; all inflorescences on branches of previous seasons; flowering February to April.   (5)
5 (4) Leaves densely snow white tomentose abaxially, faintly fine veined; inflorescences often sessile.   6 D. saeneb
+ Leaves gray tomentose abaxially, distinctly fine veined; inflorescences usually pedunculate.   5 D. orientalis

Lower Taxa


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