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2006

Urbatsch, L. E., & Cox P. B. (2006). Rudbeckia. (Editorial Committee of Flora North America, Ed.).Flora of North America. 21,

2000

Urbatsch, L. E., Baldwin B. G., & Donoghue M. J. (2000). Phylogeny of the Coneflowers and Relatives (Heliantheae: Asteraceae) Based on Nuclear rDNA Internal Transcribed Spacer (ITS) Sequences and Chlorplast DNA Restriction Site Data. Systematic Botany. 25(3), 539-565.