PLANT: Shrub, stout, intricately branched, 1-3 m tall, sparingly armed or unarmed, with densely glandular-puberulent foliage, rarely almost glabrous; bark tan to dark gray or brown. LEAVES: spatulate, oblanceolate or obovate, 8-35 mm long, 2-15 mm wide, acute to rounded at apex, in fascicles of 3-6, single in young branches. FLOWERS: pedicels 4-25 mm long, glandular-puberulent (Fig. 2B); calyx tubular (2-)4-8(-10) mm long, 5-lobed, the lobes triangular, mostly less than 1 mm long, rarely 2 mm; corolla tubular to funnelform, deep lavender or violet to white with purple veins, 8-15(-20) mm long, the lobes orbicular to broadly obovate, glabrous to puberulous on adaxial surface, 1/4 to 2/5 the length of the tube, spreading, the margins smooth to densely ciliate; stamens unequal, usually included within the tube or slightly protruding from it; filament-adnation variable, from about middle of corolla-tube to about 1/3 from the base, the filaments glabrous to densely pilose at base of the free portion, the adjacent corolla-tube glabrous or very sparsely pubescent; style about equaling the corolla-tube or slightly exceeding it, sometimes much shorter than the stamens. FRUITS: oblong-ovoid, 5-9 mm long, red, 40-60-seeded. N = 48, 60. NOTES: Lower Sonoran Desert in AZ, in washes and in flats, often in saline soils: all cos. except Coconino, Navajo and Santa Cruz (Fig. 1E); 100-1300 m (300-4300 ft); mainly Jan-Apr, occasionally at other times; CA; Baja C., Baja C. Sur, Son., Mex. REFERENCES: Windham, M.D. And G. Yatskievych. 2009. Vascular Plants of Arizona: Isoëtaceae. CANOTIA 5 (1): 27-29, 2009.