1997 IUCN red list of threatened plants (1997)

Fieldiana Botany - Field Museum of Natural History. (Chicago Natural History Museum, 1958)

Fieldiana Botany - Field Museum of Natural History. (Chicago Natural History Museum, 1958)

Fieldiana Botany - Field Museum of Natural History. (Chicago Natural History Museum, 1958)

Phytoneuron (Guy L. Nesom, 2013)