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FOC | Family List | FOC Vol. 5 | Urticaceae

20. Oreocnide Miquel, Pl. Jungh. 1: 39. 1851.

紫麻属 zi ma shu

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

Villebrunea Gaudichaud-Beaupré.

Shrubs or trees, evergreen, without stinging hairs. Leaves alternate; stipules caducous, lateral, free; leaf blade pinnately veined or 3-veined, margin serrate, denticulate, or entire; cystoliths punctiform. Inflorescences axillary, small, pedunculate, densely capitate clusters of unisexual flowers (plants dioecious); solitary glomerules or pairs of dichotomously branched cymes; bracts small. Male flowers: perianth lobes 3 or 4, valvate; stamens 3 or 4; filaments inflexed in bud; rudimentary ovary obovate-clavate, woolly. Female flowers: perianth tube adnate to ovary, mouth contracted, apex 3- or 4-toothed; staminodes absent; stigma sessile, discoid or peltate, long ciliate hairs along margin; ovule orthotropous. Achene drupaceous, straight, adnate to thinly fleshy perianth, enclosed as base or almost wholly by discoid or cuplike fleshy receptacle. Seeds with endosperm; cotyledons ovate or broad.

About 18 species: tropical and subtropical E Asia and New Guinea; ten species (one endemic) in China.

The fibers are used to make ropes, nets, and coarse cloth.

1 Leaves pinnately veined; male perianth lobes 4.   (2)
+ Leaves 3-veined; male perianth lobes 3.   (3)
2 (1) Leaf margin denticulate or serrulate from basal 1/3.   1 O. rubescens
+ Leaf margin entire.   2 O. integrifolia
3 (1) Leaf margin entire or nearly so.   (4)
+ Leaf margin serrate.   (5)
4 (3) Leaf margin entire, blade broadly ovate or oblong-ovate, 4-11 cm wide, pubescent abaxially.   8 O. trinervis
+ Leaf margin entire or sparsely crenate-serrulate distally, blade narrowly elliptic or elleptic-lanceolate, 1-4 cm wide, glabrous on both surfaces.   9 O. kwangsiensis
5 (3) Inflorescences almost sessile or pedunculate; achene often verrucose.   10 O. frutescens
+ Inflorescences, at least female ones, pedunculate; achene smooth.   (6)
6 (5) Leaves cuspidate or shortly caudate at apex, yellow-green to dark green, mostly somewhat tomentose abaxially, margin often coarsely serrate.   (7)
+ Leaves acuminate or caudate-acuminate at apex, green, pubescent or glabrous abaxially, margin serrulate or crenulate.   (8)
7 (6) Leaves elliptic, ovate, or obovate; stipules 1-2 cm.   3 O. tonkinensis
+ Leaves obovate to oblanceolate; stipules 0.7-1 cm.   4 O. obovata
8 (6) Branchlets and petioles villous; secondary veins 5-7 pairs.   5 O. serrulata
+ Branchlets and petioles appressed puberulent, then glabrescent; secondary veins 2 or 3 pairs.   (9)
9 (8) Leaves membranous, crenulate; female inflorescences 0.4-0.6 cm.   6 O. boniana
+ Leaves herbaceous, serrulate; female inflorescences 0.7-1.2 cm.   7 O. pedunculata

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