Linaria debilis Kuprian., Sovetsk. Bot. 1936(4): 115, tab. 4 (1936).
Somewhat glaucous perennial, glabrous except for inflorescence; fertile stem usually solitary, 10-25 (-50) cm, decumbent to ascending, simple or branched above, slender, densely leafy below with the leaves sometimes subsecund, usually leafless for 1.5-4 cm below inflorescence; sterile 0-5, procumbent. Leaves of fertile stems 15-55 x 0.5-2 (-4) mm, the length (12-) 25-50 x breadth, filiform above, linear or linear-lanceolate below, acute or acuminate, the margins involute, attenuate, alternate. Inflorescence with 2-10 (-25) flowers, usually short and dense in flower, lax in fruit. Bracts 2-3.5 mm, linear, reflexed. Pedicels 0.5-3 mm, erect, glandular-pubescent to subglabrous. Calyx-lobes subequal, 3.2-5 x 1-2 mm, oblong or oblong-ovate, subacute to obtuse, more or less densely glandular-pilose or glandular-puberulent towards base, the margins green or very narrowly scarious. Corolla 22-29 mm, bright yellow, the tube sometimes with violet veins and orange markings, sparsely glandular-puberulent externally; tube 4-6 mm broad at mouth; adaxial lip sinus 1.5-2.8 mm; abaxial lip sinus 1.7-3 mm; spur 12-16 mm, 1.5-2.5 mm broad at base, stout, straight or scarcely curved, equalling or exceeding rest of corolla. Capsule 5-6 mm, globose, glabrous. Seeds 1.7-2.5 mm, orbicular or reniform-orbicular, blackish-brown; wing 0.3-0.5 mm broad; disc smooth. Modified from Sutton (1988).
SC Russia (S Urals to Altai). Rs(Ec Ee Sa).
Type: USSR: Permj; Kyschtymskij zavod., 30 vi 1894 Sjusev s.n. (holo. LE).