Linaria repens (L.) Miller, Gard. Dict. ed. 8: no. 6 (1768).
Glabrous, somewhat glaucous perennial, reproducing vegetatively by slender rhizomes; fertile stems 1-numerous, 15-45 cm, erect, simple or branched above; sterile stems sometimes present. Leaves of fertile stems 14-50 x 0.5-6 mm, the length (8-) 10-30 (-70) x breadth, linear to oblanceolate, rarely filiform or elliptic, acute, the margins flat or the upper leaves sometimes revolute, attenuate, 4- to 6-verticillate or the lowermost opposite, sometimes alternate above; leaves of sterile stems similar to those of fertile stems. Inflorescence with numerous flowers, usually dense in flower, becoming lax in fruit. Bracts 2-12 mm, linear, acute, the lowermost leaf-like. Pedicels erect, 2-5 mm in flower, 4-14 mm in fruit. Calyx-lobes 2.8-4 x 0.6-1 mm, linear-lanceolate, acute. Corolla 9-14 mm, white, pale lilac or rarely violet, occasionally with pale yellow palate, usually with violet veins; tube 2-3.5 (-4) mm broad; adaxial lip sinus 1-1.5 mm; abaxial lip sinus 2-3 mm; spur 1-4 (-5) mm, 0.6-1.5 mm broad at base, narrowly to broadly conical, straight, usually obtuse, much shorter than rest of corolla. Capsule 3-4 x 4-4.5 mm, subglobose, glabrous. Seeds 1.2-1.8 (-2) mm, broadly trigonous or sometimes irregularly tetrahedral, blackish-grey; longitudinal marginal ridges 0.05 (-0.1) mm high, the intervening faces with sinuate, anastomosed ridges or ruminate-alveolate, occasionally with discrete tubercles; periclinal wall of testa-cells tabular, reticulate or rugulate, that of cells from interstices and ridge-bases papillate, the papilla small, hemispherical, rounded. Modified from Sutton (1988).
2n = 12 (Heitz, 1926; Valdés, 1970b; Löve and Kjellqvist, 1974: 184; Fernandes, Queirós and Santos, 1977: 49).
W Europe, widely naturalized in NW & C Europe and elsewhere in temperate regions. Be Bl Ga Ge Hs It [Au Br Cn Cz Da Fe Hb He Ho No Po Rs(Eb) Su Us].
Type: "repens" Alstroemer 123 (syn.? (cf. Davis, 1979e: 664) LINN-767.14!).