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