The North American Species of Asclepias L
Woodson, Robert E. (Robert Everard), 1904-1963
Article
1954
Annals of the Missouri Botanical Garden
41
1--211
BioStor
English
St. Louis, Missouri Botanical Garden Press, 1914-
BioStor: https://biostor.org/reference/11789 DOI: https://doi.org/10.2307/2394652