California Polytechnic State University, Robert F. Hoover Herbarium (OBI)
OBI165340
6b4278aa-5bac-480f-91cc-a1b725512b59
32835
Asclepias angustifolia Schweigg.
Apocynaceae
A.C. Sanders
2901
1982-07-23
1982-7-23
M.A. Dimmitt, A.S. England
United States, Arizona, Santa Cruz, Sycamore Canyon, 8 km east of Ruby and about 40 km west of Nogales, from Hank and Yank Spring to Mexican border
31.42194 -111.19389
T23S R11E sec14, 22, 23, 27, 33 & 34
1067 meters
3500-4000 ft
Narrow rocky canyon .
Vegetation at head of canyon oak woodland with Quercus emoryi, Q. arizonica, lower canyon had desert elements including Cereus gigantea. Canyon bottom with riparian species such as Platanus racemosa
erect, white-flowered perennial herb with milky juice growing along the wash.