Xylophragma unifoliolatum (Bignoniaceae), the only species of the genus with unifoliolate leaves, is described and illustrated. This new species is only known from two collections from the dry forest in Guanacaste Province, Costa Rica.
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Smithsonian Inst, Natl Museum Amer Hist, Dept Bot, Washington, DC 20560 USASmithsonian Inst, Natl Museum Amer Hist, Dept Bot, Washington, DC 20560 USA