An annual herb, diffuse, glabrous or minutely glandular-puberulous, simple or branched chiefly at the base; stem or branches prostrate, decumbent or ascending, 25-305 mm [as '1-12 in.'] long; radical leaves rosulate, oblanceolate, obtuse at the apex, wedge-shaped at the base, pinnatifid or pinnati-partite or occasionally dentate-sinuate, 0.34-1 in. long, 0.125-0.334 in. broad; lobes ovate or oblong and obtuse; petioles ranging up to 0.75 in. long; upper leaves opposite or alternate, rather smaller and on gradually shorter petioles; peduncles axillary especially to the upper leaves, occasionally subradical, solitary, 1-flowered, exceeding the leaves, 0.5-2.5 in. long, erect or ascending; calyx-segments ovate-lanceolate and lanceolate, acute or subacute, ciliate with short whitish hairs, 0.1-0.167 in. long; corolla dark purple or rosy, sparingly pubescent outside 0.25-0.5 in. wide, with two small yellow pouches or pits; stamens all fertile, glabrous; filaments all glabrous, filiform, not appendaged, not dilated at the base; capsule obliquely ovoid, glabrous or minutely glandular, 0.167-0.334 in. long, 0.125-0.167 in. broad; seeds obliquely ellipsoidal, 0.042 in. long, deeply furrowed longitudinally.
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Erect or decumbent annual to 35 cm. Leaves pinnatifid to pinnatisect. Flowers axillary, 2-saccate, greyish violet with dark magenta centre, yellow sacs and a yellow, stamen-bearing boss, limb 12-23 mm long, sacs ± 2.0-5.5 mm long, stamens and style strongly arching away from upper lip. Capsules ovate-falcate.
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