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Key to Cnidoscolus

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1 Calyx tubes of the staminate flowers 8-11 mm long, straight or constricted towards the apex, without stinging hairs, the lobes 7-10 mm long; capsules 10-12 mm long; seeds 8-9 mm long; petioles 3-8 cm long; [MS and e. LA east to s. FL and se. VA]
1 Calyx tubes of the staminate flowers 12-17 mm long, flaring towards the apex, with stinging hairs, the lobes 10-17 mm long; capsules 15-20 mm long; seeds 14-18 mm long; petioles 5-18 cm long; [AR and w. LA west and south to w. OK, Panhandle TX, s. TX, and Mexico]