A Phylogenetic Analysis of the Coneflower Genera (Asteraceae: Heliantheae)PATRICIA B. COX and LOWELL E. URBATSCH Department of Botany, Louisiana State University, Baton Rouge, Louisiana 70803-1705 [Accepted for Publication: Syst. Bot. 15:394-402 (1990)] S. 208 - 210 [1]
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Binns et al. The taxonomy, phytochemistry and biological activity of the genus Echinacea (Asteraceae). 2001 [2]