Ptelea is a genus of flowering plants in the citrus family, Rutaceae. The name, of Greek derivation, is the classical name of the elm tree. Carl Linnaeus used that word for this genus because of the resemblance of its fruit to that of the elm. Members of the genus are commonly known as hoptrees. Species Ptelea aptera Parry Ptelea crenulata Greene — California hoptree Ptelea trifoliata L. — Common hoptree Ptelea trifoliata subsp. angustifolia (Benth.) V.L.Bailey Ptelea trifoliata subsp. coahuilensis (Greene) V.L.Bailey Ptelea trifoliata f. fastigiata (Bean) Rehder Ptelea trifoliata subsp. pallida (Greene) V.L.BaileyPtelea trifoliata subsp. polyadenia (Greene) V.L.BaileyPtelea trifoliata f. pubescens (Pursh) VossPtelea trifoliata subsp. trifoliataFormerly placed hereCliftonia monophylla (Lam.) Britton ex Sarg. (as P. monophylla Lam.) Dodonaea viscosa subsp. angustifolia (L.f.) J.G.West (as P. viscosa'' L.) References External links Zanthoxyloideae Zanthoxyloideae genera