Diploid and Polyploid Cytotype Distribution in Melampodium cinereum and M. leucanthum (Asteraceae, Heliantheae) (with Tod F. Stuessy and Hanna Weiss-Schneeweiss), American Journal of Botany (2004)

Previous chromosomal studies within Melampodium (Asteraceae, Heliantheae) of Mexico and Central America have documented chromosome...



New Taxa and New Combinations in North American Cirsium (Asteraceae: Cardueae), SIDA Contributions to Botany (2004)

Six new varieties are proposed in North American Cirsium (Asteraceae: Cardueae): C. arizonicum (A. Gray)...



Two New Species of Pectis (Asteraceae: Tageteae) from South America, Novon (2002)

Pectis hassleri and P. pumila are new species, the former from the Gran Chaco area...