Very localized population of about 40 plants, on shaded outcrop near (downslope) from a serpentine seepage area. Under Pinus sabiniana and Ceanothus cuneatus cover, population is cryptic and appears stable.
the photo is of bulb coats of A. tribracteatum, from a site as yet unvouncered, and from dormant bulbs; compare to A. obtusum var. obtusum bulb coat photo