Annuals; scapose or subscapose. Stems (simple to many from or near base), unbranched, (0.2-) 0.3-2.7(-3.7) dm, hirsute or pubescent throughout, trichomes 3-4-rayed, 0.05-0.4 mm, (sometimes mixed proximally with simple or spurred ones, 0.5-1.2 mm). Basal leaves not rosulate; petiole (obscure), not ciliate; blade oblanceolate to spatulate or broadly obovate, (0.4-)1-3.5(-5) cm × (2-)6-20(-28) mm, margins dentate (in distal 1/2), surfaces pubescent, abaxially with stalked, 2-4-rayed trichomes, 0.1-0.7 mm, adaxially similar or also with fewer, simple trichomes, 0.4-0.7 mm. Cauline leaves 0-6 (on proximal 1/3 of stem); blade similar to basal. Racemes 10-50(-70)-flowered (throughout or on distal 1/3 of scape), ebracteate, elongated in fruit; rachis not flexuous, densely pubescent, trichomes 2-4-rayed. Fruiting pedicels horizontal to divaricate-ascending, straight, (1-)2-7(-10) mm, pubescent as rachis. Flowers: (late ones cleistogamous, apetalous); sepals (green or pink), oblong, 1.5-2.5 mm, glabrous or pubescent, (trichomes simple); petals white, spatulate, (2-)2.5-4.5(-5) × 1-2 mm, (emarginate or obtuse); anthers ovate to oblong, (0.1-)0.25-0.4 mm. Fruits oblong to linear or lanceolate to broadly ovate, plane, flattened, (3-) 6-12(-16) × 1.7-2.7(-3) mm; valves usually puberulent, rarely glabrous, trichomes simple, antrorse, 0.1-0.3 mm, (rarely with 2-rayed ones, or all trichomes short-stalked, 4-rayed, cruciform); ovules (12-)24-66 (-72) per ovary; style 0.01-0.3(-0.4) mm. Seeds broadly ovoid, 0.5-0.7 × 0.4-0.5 mm. 2n = 30, 32.
Plant: Annual forb usually less than 15 cm; stems scapose Leaves: basal cluster ovate, pubescence of forked hairs, 5-70 mm; cauline 1-4 INFLORESCENCE: raceme, < 75-flowered; axes generally hairy; lowest pedicel < 2 X fruit Flowers: bisexual; sepals 4, free, sepal bases equal; petals < 5 mm, often smaller or 0 in lateral inflorescences, divided < 1/8 to base, white; stamens generally (2,4)6, generally 4 long, 2 short; ovary 1, superior, chambers generally 2, septum membranous, connecting 2 parietal placentas, style 1, stigma simple or 2-lobed Fruit: a 2-celled clavate capsule 5-10 mm long, often loosely clustered, lanceolate to oblong; hairs 0 or simple, forked, and cross-shaped; style < 0.2 mm; Seeds < 100, 0.5-0.7 mm; wings 0; 2 rows per chamber Misc: Open or disturbed places; < 2000 m.; May Notes: pedicels 2-10mm References: J.C. Hickman, ed. The Jepson Manual. W.B. McDougal. Seed plants of Northern Arizona. USDA website.ASU specimens.