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Key to Sigmoidotropis
https://fsus.ncbg.unc.edu/main.php?pg=show-key.php&keyid=39933
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 |