USA, California, San Bernardino, Central Mojave Desert; Ord Mountains, at Sweetwater Spring.
34.692222 -116.823611
34° 41' 32'' N 116° 49' 25'' W
1460 meters
4800ft
Rocky canyon with metamorphic slopes and sand and gravel in wash on canyon bottom. Upland desert scrub on slopes, Populus fremontii and Forestiera around spring. No water flowing, but sand slightly moist.
Fairly common annual on canyon floor, especially right below (ca. at) the spring. Widely scattered in gravel of canyon bottom; mixed with A. fimbriatus and ca. equally common. Main stem erect, branches spreading-ascending.