homotypic synonyms:
Aethusa leptophylla (Pers.) Sprengel; Apium leptophyllum (Pers.) F. Muell. ex Benth.; Cyclospermum leptophyllum (Pers.) Eichler; Cyclospermum leptophyllum (Pers.) Sprague; Cyclospermum leptophyllum (Pers.) Sprague ex Britton & P. Wilson; Helosciadium leptophyllum (Pers.) DC.; Pimpinella leptophylla Pers.; Ptychotis leptophylla (Pers.) Penz.; Selinum leptophyllum (Pers.) E.H.L.Krause;

protologue: Gen. N. Amer. Pl. 1: 190 (1818)
URL protologue: https://archive.org/stream/mobot31753002739768#page/190/mode/2up

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