Asclepias mexicana grows in the western United States and Mexico. It has been found in the U.S. in California, Washington, Oregon, Idaho, and Arizona.[1]A. mexicana Cav. can be distinguished by its whorled leaves, arranged in threes on the main stem and flowering branches and are rarely opposite.[2][3]
^Carr, Katherine (1942). "A Key to the North American Species of Asclepias, without Fruit or Color Characters". Castanea. 7 (1): 1–7. JSTOR 4031299.
^Blackwell, Will H. (1964). "Synopsis of the 23 Species of Asclepias (Asclepiadaceae) in Tamaulipas and Nuevo Leon Including Two New Species, Asclepias Bifida and Asclepias Prostrata". The Southwestern Naturalist. 9 (3): 171–180. doi:10.2307/3669574. JSTOR 3669574.
^Woodson, Robert E. (1944). "Notes on Some North American Asclepiads". Annals of the Missouri Botanical Garden. 31 (4): 363–371. doi:10.2307/2394370. JSTOR 2394370.
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