perennial in periodically mowed, grassy meadow-like highway right-of-way. Similar to A. aspera but single stemmed, erect habit shows adaptation to taller prairie grassland of southeastern Great Plains
along roadside drainage cutting deep sandy soil of stabilized mesquite-saltbush hummocks on the Hueco Bolson surface. This sand-loving, rhizomatous perennial was long known as A. arenaria
linear leafed suffrutescent perennial on silty gypseous soils at base of low eroding shaly limestone slope. View of erect dehiscent tubular fruiting pods splitting lengthwise with dark brown seed still visible inside.
a vine-like, sub-shrubby perennial plant on open stretch of sandy soil in shallow drainage wash draining coastal plain separating low volcanic hills. Sonoran endemic. Early morning photo of flowers just beginning to open.