Linaria alpina (L.) Miller, Gard. Dict. ed. 8: no. 4 (1768).
Glaucous annual, biennial or perennial, glabrous or rarely glandular-pubescent in inflorescence; fertile stems numerous, 5-25 cm, procumbent ro ascending, usually simple; sterile stems numerous. Leaves of fertile stems 3.5-15 x 0.7-2 (-3.2) mm, linear to oblong-lanceolate, acute to obtuse, flat, attenuate, mostly verticillate in whorls of 4, the uppermost sometimes alternate; leaves of sterile stems similar to those offertile stems. Inflorescence with 2-10 flowers, dense in flower, lax in fruit, the lowermost flowers rarely in a whorl of 3-4. Bracts 3-13 mm, linear, acute, the lowermost leaf-like. Pedicels 2-13 mm in flower, up to 16 mm in fruit, erect or suberect. Calyx-lobes unequal, linear, acute to obtuse; adaxial lobe 3.5-5.5 x 0.5-1 mm; abaxial lobes 3-5 x 0.6-1.4 mm. Corolla (11-) 13-22 mm, violet, usually with yellow palate, rarely pink or whitish-yellow; tube 1.5-3 mm broad; adaxial lip sinus 2.5-4.5 mm, abaxial lip sinus 1-2.5 mm; spur 5.5-9 (-10) mm, slender, straight or slightly curved, subequalling rest of corolla. Capsule 3-6 mm, globose, glabrous. Seeds 1.7-2.5 mm, suborbicu1ar, plano-convex, black; hilum narrow; wing 0.3-0.6 mm broad, somewhat thin, smooth, not papillate; disc reniform-orbicular, smooth or with low tubercles, not papillate; periclinal wall of testa-cells tabular, verruculate, the anticlinal walls of testa-cells angular with intermittent ridge over junction. Modified from Sutton (1988).
2n = 12 (Heitz, 1927a: 51; Favarger and Huynh, 1964: 207; Lovka et al., 1971; Fernandes, Queirós and Santos, 1977: 50).
C & S Europe. Al Au Cz Ga Ge Gr He Hs It Ju Rm.
Type: “Linaria quadrifolia supina Bauh. In Helvetia, Styria, Pyrenaeis” (syn. UPS-Herb. Burser XII.32, microfiche IDC-1064/76/15!).