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Key to Vincetoxicum

Apocynaceae

Vincetoxicum

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1 Corolla lobes pubescent on the upper surface; flowering peduncles < 2 cm long; fruiting peduncles < 2.5 cm long
1 Corolla lobes glabrous on the upper surface; flowering peduncles mostly 2-2.5 cm long; fruiting peduncles < 2.5 cm long