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Key to Cryptostegia

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1 Corolline corona lobes bifid; calyx lobes 13-20 mm long, the margins reflexed; follicles (8-) 10-15.5 cm long; corolla pale mauve
1 Corolline corona lobes unlobed; calyx lobes 7-13 (-14) mm long, the margins planar; follicles 5-10 cm long; corolla reddish purple