Cynanchum arizonicum (Gray) Shinners
Synonyms: Metastelma arizonicum Gray; Metastelma
Distribution: Arizona, Maricopa, Pima, and Pinal
counties; Mexico, Sonora (Sundell 1993). Southern Arizona
in Pinal, Maricopa, and Pima counties (Shreve & Wiggins 1964).
Plants Seen or Cited: One specimen in NM Natural Heritage Program Database:
Hidalgo Co., extreme southeast (sic, should
be southwest) corner of county near Guadalupe Canyon on steep,
southwest-facing slope, 15 August 1979.
Habitat: Among shrubs on rocky hillsides, Lower Sonoran
Zone (Shreve & Wiggins 1964); rocky slopes and canyons of
desert mountain ranges; 1,500-4,500 ft. (Sundell 1993).
Discussion: This plant is not listed in Wooton & Standley
(1915), Kearney & Peebles (1960), Shreve & Wiggins (1964),
Martin & Hutchins (1980), or Sundell (1981, 1993) as being
present in New Mexico if it is treated at all. It seems to be primarily
a Sonoran Desert species. Sundell (1993) says nothing about its
rarity. Since it does not seem to be rare in its range in Arizona
and Sonora, I suggest that it not be given special consideration
in New Mexico.
Kearney, T.H. and R.H. Peebles. 1960. Arizona Flora, second edition
with supplement. University of California Press, Berkeley, CA.
Martin, W.C. and C.R. Hutchins. 1980. A flora of New Mexico. J.
Shreve, F. and I.L. Wiggins. 1964. Vegetation and flora of the
Sonoran Desert. Two volumes. Stanford University Press. (page
Sundell, E. 1981. The New World species of Cynanchum L.
subgenus Mellichampia (A. Gray ex S. Wats.) Woods.
(Asclepiadaceae). Evolutionary Monographs 5:1-63.
Sundell, E. 1993. Asclepiadaceae. Journal of the Arizona-Nevada
Academy of Science 27(2):182.
Wooton, E.O. and P.S. Standley. 1915. Flora of New Mexico. Contributions
from the United States National Herbarium, Smithsonian Institution,
Government Printing Office, Washington, D.C.
Information Compiled By: David L. Bleakly, 1998