Linaria platycalyx Boiss., Voy. Bot. Midi Esp. 2: 459, tab. 130 (1839).
Somewhat glaucous annual or perennial, more or less glabrous; fertile stems numerous, 10-40 cm, procumbent to erect, simple or with whorled branches above; sterile stems 1-4. Leaves of fertile stems 3-20 (-35) x 2-14 (-20) mm, broadly elliptic to ovate, mucronate, fiat, attenuate or cuneate, mostly verticillate in whorls of 3; leaves of sterile stems similar to those offertile stems. Inflorescence with 1-3 (-6) flowers, dense in flower, lax in fruit. Bracts 4-6.5 mm, elliptic, acute. Pedicels 2-10 (-14) mm in flower, 5-18 mm in fruit, erect to erecto-patent. Calyx-lobes unequal, oblong to ovate, acute to obtuse; adaxial lobe 7-11 x 3.5-7 mm; abaxial lobcs 5.5-7.5 x 2-4.5 mm. Corolla (18-) 20-27 mm, bright yellow; tube broad; adaxial lip sinus 1.8-2.2 mm; abaxial lip sinus 0.7-1 mm; spur 8.5-12 mm, stout, somewhat curved, shorter than rest of corolla. Capsule 4-8 mm, globose, glabrous. Seeds 2.3-3 mm, suborbicular, plano-convex to somewhat concavo-convex; hilum very narrow; wing 0.6-1 mm broad, membranous, smooth, yellowish- or whitish-grey; disc smooth or rarely with small tubercles, without papillae; periclinal wall of testa-cells convex-tabular, more or less smooth, the anticlinal walls of testacells angular or somewhat sinuate with interrupted, irregular ridge most prominent at junction between 3 adjacent cells. Modified from Sutton (1988).
SW Spain. Hs.
Type: SPAIN: [Cádiz]; (in umbrosis regionis alpinae, Serrania de Ronda prope) Grazalema (en el Cerro de San Cristoval loco los Pinares dicto, vi 1839) Haenseler s.n. (lecto. (Valdés, 1970a: 222-223) G-BOIS).