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(Last Modified On 3/8/2013)
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(Last Modified On 3/8/2013)
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Genus
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URENA L.
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PlaceOfPublication
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Sp. P1. 692. 1753
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Reference
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Gen. P1. ed.5, 309. 1754.
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Description
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Suffrutices, the indumentum usually of stellate hairs. Leaves petiolate, the stipules subulate and caducous; blade polymorphic, subentire to 3- to 5-palmati- parted, the 1 or 3 median veins on the dorsal surface bearing near the base an open, rounded or oblong gland (extrafloral nectary). Flowers axillary, solitary or in small glomerules, sometimes in terminal racemiform inflorescences, the pedicels short or the flowers subsessile; epicalyx of 5 partly united bractlets; calyx cupuli- form, deeply 5-lobed, the lobes 1-nerved; petals 5, pink or purple; staminal tube about as long as the corolla, enlarged at the base, truncate at the apex, the anthers on short filaments, clustered subapically; ovary of 5 1,-ovulate carpels; style branches 10, the stigmas discoid, fimbriate. Fruits separating into 5 indehiscent mericarps, these trigonous-obovoid, coriaceous, the dorsum convex and densely glochidiate- echinate; seeds trigonous-reniform, glabrous.
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Habit
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Suffrutices
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Note
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A pantropical, monotypic genus; the only species, U. lobata L., is extremely variable especially in shape of leaf blades and in indumentum (cf. Giirke, Engl. Bot. Jahrb. 16: 361-385. 1892, and Hochreutiner, Ann. Conserv. Jard. Bot. Geneve 5: 131-146. 1901).
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