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18. Sphenodesme Jack, Malayan Misc. 1: 19. 1820.
楔翅藤属 xie chi teng shu
Shrubs, climbing. Hairs simple or stellate. Stems lenticellate when young. Leaves opposite, short petiolate, margin entire. Inflorescences capitate cymes, 3-7-flowered, subtended by a whorl of 5 or 6 prominent involucral bracts. Calyx funnelform, 5-dentate, sometimes enlarged or inflated in fruit. Corolla tube short cylindric; lobes 5 (or 6), narrowly lanceolate to ovate-oblong. Stamens 5(-7); anthers ovate. Ovary imperfectly 2-locular; ovules 2 per locule, pendulous from apex of a placenta bearing axis. Stigma 2-cleft. Fruit indehiscent, small, obovoid to globose, included or nearly included in calyx, 1- (or 2)-seeded.
About 16 species: mainly in tropical and subtropical Asia, four species in China.
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| 1 |
Cyme 5-flowered; calyx glabrous |
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1 Sphenodesme pentandra var. wallichiana |
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Cyme 7-flowered; calyx with pilose or stellate hairs. |
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(2) |
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| 2 (1) |
Hairs simple; involucral bracts oblanceolate-spatulate to spatulate; calyx usually with accessory teeth; fruit hairy |
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2 Sphenodesme mollis |
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Hairs stellate; involucral bracts spatulate-lanceolate or obovate; calyx without accessory teeth; fruit glabrous. |
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(3) |
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| 3 (2) |
Leaf blade narrowly elliptic to ovate; involucral bracts oblanceolate; flowers 4- or 5-merous; stamens included |
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3 Sphenodesme involucrata |
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Leaf blade obovate-elliptic; involucral bracts spatulate-lanceolate; flowers 5- or 6-merous; stamens exserted |
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4 Sphenodesme floribunda |
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Lower Taxa
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