Template:Cox & Urbatsch, 1994
Appearance
- Cox, P.B. & Urbatsch, L.E. 1994. A Taxonomic Revision of Rudbeckia subg. Macrocline (Asteraceae: Heliantheae: Rudbeckiinae). Castanea; Journal of the Southern Appalachian Botanical Society 59(4): 300–318. JSTOR