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Key to Sigmoidotropis

Fabaceae

Sigmoidotropis

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1 Stems trailing or twining; leaflet blade membranous to papery, usually glabrous; inflorescence with 2-5 floral node; flowers 2-3 cm long; legume 6-14 cm long × 0.5 cm wide
1 Stems often intricately twining; leaflet blade membranous, usually densely pale-pubescent abaxially; inflorescence with 2 or 3 floral node; flowers 3-4 cm long; legume 10-18 cm long × 0.4-0.7 cm wide