Distribution: On arid rocky slopes of the mountains near Bahia de los Angeles, and among volcanic rocks on the mountains of Isla Angel de la Guarda east of Bahia de los Angeles in the Golfo de California.
Habit: Winter or spring annual from a slender taproot; acaulescent or rarely with a single stem to ca. 3 cm long.
Leaves: Leaves forming a rosette, dull green, thin, sparsely hirsute mostly along the margins, the hairs 0.3-0.8 mm long mixed with minute glandular hairs 0.14-0.2 mm long, sometimes with conspicuous whitish bundles of raphides scattered near the surface of broad leaves, young leaves often with conspicuous reddish purple splotches fading with age, oblanceolate to very narrowly oblanceolate in outline, 3.5-13.7 cm long, 0.1-3.1 cm wide, lyrate-pinnatifid or -pinnatisect in robust plants to merely pinnatifid, bipinnatifid, or serrate in small individuals, acute at the apex, the terminal lobe if present ovate, 2-4.5 cm long, 1.6-3.1 cm wide, the margin dentate to serrate, the lateral lobes 6-33 on each side of the winged petiole, angled forward, to nearly perpendicular, linear to oblong-lanceolate or oblong, the smaller lobes deltoid, acute at the apex, the margin dentate, serrate, or entire, 0.1-17 mm long, 0.1-4 mm wide, the membranous winged petioles 0.8-7 cm long. Buds erect.
Flowers: Flower without noticeable scent, fading pink, generally 1-3 opening per day, ovary 0.5 cm long, sessile, evenly glandular pubescent, floral tube 0.5-4 cm long, ca. 1.4 mm in diameter medially, flaring to 5 mm at the mouth, moderately hirsute, sepals green, 5-12 mm long, 0.7-3.5 mm wide, sparsely hirsute, mostly on the midvein and margins and also with scattered erect glandular hairs, petals fading pink, oblanceolate to narrowly obovate, 8-16 mm long, 4.5-15 mm wide, glabrous or very sparsely hirsute, the few hairs near the margins. Staminal filaments 5-8 mm long, anthers pale yellow, 3-5 mm long, shedding pollen directly on the stigma at anthesis, style 1-4.8 cm long, stigma lobes 2-5 mm long and often erect and coherent at anthesis.
Fruit: Capsule ovoid, terete falcate at least when young, 6-19 mm long, 3-7 mm in diameter, tapering to a sterile beak 3-7 mm long, the free tips 0.5-2 mm long, evenly, glandular pubescent and sparsely hirsute, the valves with 4-7 tubercles along the margin, the tubercles 1-1.5 mm high, 1-3 mm apart, the capsule drying to a hard woody texture, length of dehiscence about 1/3 capsule length; sessile or on a pedicel 0.5-1 mm long.
Seeds: Seeds irregularly triangular in outline sometimes somewhat curved, dark reddish brown, 2.5-3 mm long, 1.6-2.5 mm wide, 1-30 per capsule arranged in. 2 rows in each locule, the two rows partially overlapping, the raphe oriented at various angles to the plane of the axis of the capsule; seed-collar broadly triangular, constituting slightly less than 1/2 of the seed, the seed-collar margins rolled outward, the exposed cavity filled with large empty golden brown cells derived from the outgrowths, the entire structure with a narrow groove obscuring the raphe, the margin obscurely sinuate, the seed surface minutely roughened. Self compatible and autogamous.
Chromosomes: Gametic chromosome number, n=7.
Notes: Flowering December to May, after rains.