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Key to Funastrum

Apocynaceae

Funastrum

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1 Corolla lobes glabrous on the upper (inner) surface; inflated corona segments oblong, with medial constrictions; leaf margins undulate/crisped; follicle 10-13 cm long
1 Corolla lobes inconspicuously hispidulous on the upper (inner) surface; corona segments ovoid without constrictions; leaf margins plane; follicle 5-9 cm long.
  2 Leaf blades elliptic to oval, 0.5-2.5 cm wide, the base obtuse to shallowly cordate; calyx lobes 3-4 mm long; corolla lobes 6-7 mm long; [wet habitats of peninsular FL and s. TX (Rio Grande Valley) southwards]
  2 Leaf blades lanceolate to ovate, 0.7-4.5 cm wide, the base cordate (sagittate, hastate); calyx lobes 2-3 mm long; corolla lobes 3-6 mm long; [dry habitats of AR, OK, e. and s. TX westwards and southwards]