When Jatropha costaricensis Webster & Poveda was described from Guanacaste, Costa Rica, some years ago (Webster & Poveda, 1978), it was predicted that other xeric relict taxa might be discovered elsewhere in Central America. Recent botanical exploration in Nicaragua has disclosed not only a number of new populations of Jatropha podagrica Hook. in rocky areas in Dept. Esteli, but also on basaltic ridges in Dept. Boaco a species that appears to be undescribed. Unlike J. podagrica, which belongs to subg. Jatropha (Dehgan & Webster, 1979), the plant from Boaco clearly is referable to subg. Curcas.