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FOC | Family List | FOC Vol. 5 | Urticaceae

3. Laportea Gaudichaud-Beaupré, Voy. Uranie, Bot. 498. 1830.
[nom. cons.]

艾麻属 ai ma shu

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

Fleurya Gaudichaud-Beaupré; Sceptrocnide Maximowicz; Urticastrum Heister ex Fabricius, nom. rej.

Herbs or subshrubs, armed with stinging hairs. Leaves alternate, petiolate; stipules deciduous, intrapetiolar, incompletely connate, apex 2-cleft; leaf blade papery, pinnately veined or 3-veined, margin often coarsely dentate or serrate, rarely entire; cystoliths punctiform or botuliform. Inflorescences solitary, axillary, pedunculate, loose glomerules forming panicles or sometimes racemes or spikes, unisexual (plants monoecious or dioecious); bracts present, very small. Male flowers: perianth lobes 4 or 5, slightly subvalvate, depressed, inflexed in bud; stamens 4 or 5; rudimentary ovary clavate or subglobose. Female flowers: perianth lobes 4, free or connate at base, strongly unequal, dorsal-ventral 2 greatly unequal and smaller, lateral 2 equal and larger; staminodes absent. Ovary at first straight, soon oblique, ovoid; style usually filiform; stigma often linear, at length often reflexed, papillose on 1 side; ovule orthotropous. Achene ovoid to semicircular, often compressed, sessile or stipitate on oblique torus, usually reflexed on dorsiventrally or laterally winged pedicels. Seeds with thin or no endosperm; cotyledons broad.

About 28 species: pantropical; seven species (two endemic) in China.

The stem fibers are used to make ropes. The stinging hairs are poisonous.


1 Pedicels of female flowers conspicuously laterally and symmetrically winged; achene articulated on pedicel.   (2)
+ Pedicels of female flowers slightly dorsiventrally and asymmetrically winged, or not winged; achene not articulated on pedicel.   (4)
       
2 (1) Subshrubs or herbs; leaf blade broad ovate to cordate, base often truncate, abaxial surface often purplish.   3 L. violacea
+ Herbs; leaf blade ovate to lanceolate, base broadly cuneate or rounded, rarely shallowly cordate, abaxial surface light green.   (3)
       
3 (2) Herbs often with tuberous roots; leaf axils often with woody bulbils; female perianth with the 2 lateral lobes largest.   1 L. bulbifera
+ Herbs without tuberous roots; leaf axils usually lacking woody bulbils; female perianth with the dorsal lobe largest.   2 L. medogensis
       
4 (1) Leaf blade apex long caudate; achene smooth.   4 L. cuspidata
+ Leaf blade apex acuminate; achene with a triangular ridge enclosing a warty depression.   (5)
       
5 (4) Inflorescences paniculate, to 5 cm; stigma ligulate.   (6)
+ Inflorescences long spicate, to 25 cm; stigma 3-fid.   7 L. interrupta
       
6 (5) Stems, petioles, and perianth without gland-tipped hairs; leaf blade 3.5-7.5 × 2-6 cm; inflorescences 1-5 cm; peduncle 0.1-2.5 cm.   5 L. fujianensis
+ Stems, petioles, and perianth with long, gland-tipped hairs; leaf blade 8-17 × 6-13 cm; inflorescences to 20 cm, peduncle 7-14 cm.   6 L. aestuans

Lower Taxa


 

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