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FOC | Family List | FOC Vol. 12 | Malvaceae

12. Urena Linnaeus, Sp. Pl. 2: 692. 1753.

梵天花属 fan tian hua shu

Herbs perennial or shrubs, stellate. Leaves alternate; leaf blade orbicular or ovate, palmately lobed or sinuate, with 1 or more prominent foliar nectaries on abaxial surface. Flowers solitary or nearly fascicled, rarely racemelike, axillary or rarely aggregated on twig tips. Epicalyx campanulate, 5-lobed. Calyx 5-parted. Petals 5, stellate puberulent abaxially. Staminal column truncate or slightly incised; anthers numerous, on outside of staminal column only, nearly sessile. Ovary 5-loculed; ovule 1 per locule; style branches 10, reflexed; stigma discoid, apically ciliate. Fruit a schizocarp, subglobose; mericarps 5, ovoid, usually with spines, these each with a cluster of short barbs at tips. Seed 1, obovoid-trigonous or reniform, glabrous.

About six species: in tropical and subtropical regions; three species (one endemic) in China.

Some authorities have restricted Urena to the taxa with barb-tipped setae, sometimes treating these as a single, very variable, pantropical species, and placed other species, including U. repanda, in Pavonia. Some species of Triumfetta (Tiliaceae s.l.) are superficially rather similar and have been confused with this genus.

1 Mericarps glabrous or striate; epicalyx lobes long acuminate separated by rounded sinuses; calyx persistent; flowers ± aggregated into terminal inflorescences.   3 U. repanda
+ Mericarps with prominent barb-tipped setae, puberulent; epicalyx lobes oblong-lanceolate to -ovate, acute, separated by acute sinuses; calyx caducous; flowers axillary, solitary or in small fascicles   (2)
2 (1) Epicalyx cupular in fruit, stiff, appressed to mericarps, lobes 4.5-5 × 2.5-3 mm; leaf blades on proximal part of stem angular or shallowly lobed.   1 U. lobata
+ Epicalyx spreading or reflexed, flexible, lobes 3-4 × 1-1.5 mm; leaf blades on proximal part of stem angular or palmately lobed or mostly deeply and often doubly incised.   2 U. procumbens

Lower Taxa


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