Linaria cossonii Bonnet & G. Barratte, Explor. Tunis. Cat. Pl.: 317 (1896).
Glabrous, very glaucous perennial with somewhat stout, woody rootstock, not stoloniferous; fertile stems usually numerous, 25-50 (-90) cm, arcuate-ascending to suberect, slender or somewhat robust, simple or sparingly branched above, sparsely leafy, sometimes tinged with purple below; sterile stems sometimes present, procumbent, slender, flexuous. Leaves of fertile stems 5-45 x 0.4-2 mm, filiform to narrowly linear-lanceolate, acute, revolute, attenuate, alternate, the lowermost much shorter than upper, caducous; leaves of sterile stems similar to those of fertile stems but verticillate. Inflorescence with 25-40 flowers, somewhat dense in flower, lax in fruit. Bracts 1-3 mm, linear, acute, usually shorter than pedicels in fruit. Pedicels 1-2 mm in flower, 2.5-5 mm in fruit, erecto-patent to suberect. Calyx-lobes equal, 1.3-3 x 0.5-0.9 mm, lanceolate, subacute to obtuse, the margins narrowly white-scarious towards base. Corolla 10-14 mm, violet; tube 2.5-3 mm broad; adaxial lip sinus 1.3-2.2 mm; abaxial lip sinus 0.8-1 mm; spur 5-7 mm, 1-2 mm broad at base, narrowly conical, straight or scarcely curved, acute, more or less equalling rest of corolla. Capsule 1.5 -2.5 mm, depressed-globose, emarginate, glabrous. Seeds 0.7-1 mm, crescenti-trigonous or sometimes tetrahedral, blackish-brown; longitudinal marginal ridges 0.05-0.1 mm, rounded or subacute, sometimes incomplete; faces with more or less contiguous, frequently anastomosed ridges; periclinal wall of testa-cells rugulate, tabular, that of cells from ridge-bases or interstices papillate, the papillae small, conical or rounded. Modified from Sutton (1988).
Tunisia. Ag Tn.
Type: TUNISIA: Zougag, 20 v 1883 Cosson et al. (isosyn. K!).