Linaria algarviana Chav., Monogr. Antirrh.: 142 (1833).
Annual, glabrous except for sparsely glandular-pubescent inflorescence; fertile stems (1-) 5-35, 8-40 cm, decumbent or ascending, simple or sparsely branched; sterile stems 0-30, prostrate or procumbent. Leaves of fertile stems 3-12 (-20) x 0.6-1.5 mm, linear, acute or obtuse, flat, mostly alternate, often very sparse; leaves of sterile stems elliptic, subacute to obtuse, 3-verticillate. Inflorescence with 1-8 flowers, lax in flower and fruit. Bracts 1-2.5 mm, linear, acute. Pedicels (2-) 5-10 mm in flower and fruit, erect, free. Calyx-lobes subequal, 2.5-3.6 x 0.7-1 mm, linear-lanceolate, acute to obtuse, the margin scarious, white or tinged with purple. Corolla 20-25 mm, violet, the palate white or pale yellow usually reticulated with violet; tube 3.5-4.5 mm broad; adaxial lip sinus 2-3 mm; abaxial lip sinus 1.2-1.5 mm; spur 11-13 mm, 1.5-2 mm broad at base, straight, equalling or somewhat exceeding rest of corolla. Style bifid. Capsule 2.5-4 x 3-4 mm, oblong, shallowly emarginate, glabrous; loculi equal, each loculus dehiscing by 3 (-5) teeth. Seeds 0.5-0.7 mm, pyriform-triquetrous, transversely ridged or occasionally ruminate-alveolate, black; transverse ridges (3-) 4-7, rounded, discrete or rarely anastomosed; periclinal wall of testa-cells verrucate or rugulate, the margin usually somewhat raised, forming rounded marginal papilla towards ridge-apex, the median papilla occasionally present, small, rounded, more or less isodiametric. Modified from Sutton (1988).
2n = 12 (Viano, 1974: 325).
SW Portugal (Algarve). Lu.
Type: PORTUGAL: Algarve; prope Promontorium sacrum Isnard s.n. (lecto. (Viano, 1978a: 101) P-JU).