Annuals or biennials; (glaucous), glabrous throughout or sparsely pubescent basally. Stems (simple or, often, several from base), branched distally, 1.5-5(-6) dm. Basal leaves rosulate; petiole 0.5-2.3 cm; blade broadly oblanceolate, (1.8-)2-3.5(-4) cm × 10-15 mm, margins entire or remotely denticulate. Cauline leaves sessile; blade broadly ovate to oblong, (slightly smaller distally), base strongly auriculate to amplexicaul, margins entire. Racemes dense. Fruiting pedicels horizontal to divaricate-ascending, straight or upcurved, (slender), 4-8.5(-10) mm. Flowers: sepals ascending to spreading, purplish to greenish or white, 4.5-5.5 × 1.2-1.5 mm; petals white, spatulate, 9-11 × 3-4 mm, (margins not crisped), claw 4-6 mm; median filament pairs 4-6 mm; anthers linear, 3-4 mm; gynophore (stout), 0.2-1.5 mm. Fruits erect to ascending, straight or slightly recurved, (distinctly tortuous), torulose, 2-4 cm × 1.2-1.5 mm; ovules 30-42 per ovary; style cylindrical, 1-3 mm; stigma slightly 2-lobed. Seeds 1.2-1.7 × 0.6-0.9 mm.

Flowering Apr-Jun. Brush communities, shale formations, clay or silty flat, juniper woodlands; 1300-2200 m; Nev., Utah.

Thelypodiopsis vermicularis is known in eastern Nevada from Elko and White counties.