Reference:Cox1994a
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Verbatim text: Cox, P. B. and L. E. Urbatsch. 1994. A taxonomic revision of Rudbeckia subg. Macrocline (Asteraceae: Heliantheae: Rudbeckiinae). Castanea 59: 300–318.
Author: Cox, P.B., Urbatsch, L.E.
Year: 1994
Title: A taxonomic revision of Rudbeckia subg. Macrocline (Asteraceae: Heliantheae: Rudbeckiinae)
Journal: Castanea
Volume: 59
Pages: 300–318