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Genus  Vigna  comprise several domesticated species including cowpea and mungbean, and diverse wild species. We found an introgressive hybrid population derived from two wild species,  Vigna umbellata  and  Vigna exilis , in Ratchaburi district, Thailand. The hybrid was morphologically similar to  V. umbellata  but habituated in a limestone rock mountain, which is usually dominated by  V. exilis . Analyzing simple sequence repeat loci indicated the hybrid has undergone at least one round of backcross by  V. umbellata . We found the hybrid acquired vigorous growth from  V. umbellata  and drought tolerance plus early flowering from  V. exilis , and thus has taken over some habitats of  V. exilis  in limestone karsts. Given the wide crossability of  V. umbellata , the hybrid can be a valuable genetic resource to improve drought tolerance of some domesticated species.

A Homoploid Hybrid Between Wild Vigna Species Found in a Limestone Karst