Linaria filicaulis Boiss. ex Leresche & Levier, Jour.Bot. (London) 17: 200 (1879).
Glaucous, glabrous annual; fertile stems numerous, 7-40 cm, decumbent, simple or rarely branched; sterile stems usually numerous, the base long, flexuous, thread-like, stoloniferous. Leaves 5-10 x 1.4-3 mm, obovate to linear-oblanceolate, subobtuse, flat, somewhat fleshy, mostly in whorls of 4. Inflorescence with 2-6 flowers, dense in flower, somewhat lax in fruit. Bracts 2.7-4.5 mm, linear to linear-oblanceolate, acute. Pedicels 1.5-4 mm in flower and fruit erect. Calyx-lobes unequal, oblong to linear-lanceolate, obtuse to subacute; adaxial lobe 4-5 x 0.6-0.8 mm; abaxial lobes 3-4 x 0.7-1 mm. Corolla 19-26 mm, deep pink or lilac with yellow palate; tube 4-5 mm broad; adaxial lip sinus 2.5-3 mm; abaxial lip sinus 1-1.5 mm; spur 7.5-9 mm, somewhat slender, slightly curved, shorter than rest of corolla. Capsule 4.5-6.5 mm, globose, glabrous. Seeds 2.7-3.3 mm, suborbicular, more or less flat, grey to blackish-grey; hilum narrow; wing 0.5-0.7 mm broad, thin, smooth or papillate towards disc; disc reniform, densely papillate, with or without tubercles, the tubercles low and rounded; periclinal wall of testa-cells tabular or papillate, densely verruculate, the papillae large and whitish, the anticlinal wall of testa-cells angular with low ridge over junction. Modified from Sutton (1988).
CN Spain. Hs.
Type: SPAIN: Santander; Picos de Europa, vii-viii 1878 Boissier s.n. (lecto. (Valdés, 1970a: 213,215) K!, isolecto. BM! G-BOIS!).