Novon 12: 322. 2002.
Perennials; caudex simple, (often enlarged by persistent leaf bases); densely pubescent, trichomes (sessile or short-stalked), rays furcate or bifurcate, (nearly smooth to finely tuberculate). Stems simple from base, decumbent, (occasionally few-branched), 0.5–1.5(–2) dm. Basal leaves: blade elliptic to broadly obovate, triangular, rhombic, or round, 1.5–3(–4) cm, margins often sinuate or shallowly lobed. Cauline leaves (sessile or shortly petiolate); blade elliptic to oblanceolate to obovate, 0.5–1.5 cm, (base narrowed to petiole), margins entire. Racemes compact to loose. Fruiting pedicels (ascending or divaricate-spreading, straight to loosely sigmoid or curved), 4–10 mm. Flowers: sepals oblong to broadly elliptic, 4–7.5 mm, (lateral pair saccate or not); petals spatulate, 7.5–10 mm. Fruits (sessile or substipitate), elliptic, suborbicular, or oblong, strongly compressed (angustiseptate), 5–9 mm, (rounded to sharply keeled on 1 side, edges ± keeled); valves: (margins covering replum edges or not), usually pubescent throughout or, rarely, glabrous inside; ovules (4–)8–14(–16) per ovary; style 2–4.5(–5) mm. Seeds slightly flattened.
Idaho, Mont., Wyo.
Subspecies 3 (3 in the flora).
Differences in fruit morphology become blurred and the three subspecies are often indistinguishable where their ranges meet near the intersection of Idaho, Montana, and Wyoming.
|1||Fruits elliptic, not keeled, valve margins (thin, rounded), not covering replum edges.||Physaria carinata subsp. paysonii|
|1||Fruits elliptic, suborbicular, or broadly oblong, keeled on one side, valve margins covering replum edges||> 2|
|2||Fruits elliptic, bases narrow-rounded to acute, apices ± acute.||Physaria carinata subsp. carinata|
|2||Fruits suborbicular to elliptic or broadly oblong, bases and apices rounded.||Physaria carinata subsp. pulchella|