Verbatim text: Porter, Ced. L. 1943. The genus Amphipappus Torr. and Gray. Amer. J. Bot. 30: 481–483.
Author: Porter, Ced L.
Year: 1943
Title: The genus Amphipappus Torr. and Gray
Journal: Amer. J. Bot
Volume: 30
Pages: 481–483