Verbatim text: Semple, J. C. 1974. The phytogeography and systematics of Xanthisma texanum de Candolle (Asteraceae): Proper usage of infraspecific categories. Rhodora 76: 1–19.
Author: Semple, J.C.
Year: 1974
Title: The phytogeography and systematics of Xanthisma texanum de Candolle (Asteraceae): Proper usage of infraspecific categories
Journal: Rhodora
Volume: 76
Pages: 1–19