Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.
1 Stems trailing or twining; leaflet blades membranous to papery, usually glabrous; inflorescences with 2-5 floral nodes; flowers 2-3 cm long; legumes 6-14 cm long × 0.5 cm wide
1 Stems often intricately twining; leaflet blades membranous, usually densely pale-pubescent abaxially; inflorescences with 2 or 3 floral nodes; flowers 3-4 cm long; legumes 10-18 cm long × 0.4-0.7 cm wide