Keil, D.J., Pinkava, D.J. 1976. Chromosome counts and taxonomic notes for Compositae from the United States and Mexico. American Journal of Botany. 63(10): 1393-1403.

Keil, D.J., Pinkava, D.J. 1976. Chromosome counts and taxonomic notes for Compositae from the United States and Mexico. American Journal of Botany. 63(10): 1393-1403.

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