Slender glaucescent annual, erect, 12-40 cm. Leaves of sterile shoots opposite or whorled, obovate-elliptic. Leaves of flowering stems linear or sublanceolate-linear, lower-most opposite or whorled, obovate-elliptic, 20-40 x 1-3 mm. Racemes lax. Bracts c. 1-3 x as long as c. 2 mm flowering pedicels; pedicels 1,5-3 mm in fruit. Calyx lobes linear, immarginate, glabrous, very acute, 4-8 mm in flower, patent, usually elongating and erect in fruit, rarely oblong-spathulate. Corolla white, 5-7 mm, upper lip with recurved oblong lobes; spur subulate, incurved, 8-11 mm. Capsule suborbicular, 4-5 mm, usually 2-3 x shorter than accrescent calyx, rarely equal. Seeds angled, rugose-pitted, 1 mm. Fl. 4-6. Macchie, rocky slopes, waste places, fallow fields, s.l.-1800 m.
1. Calyx lobes linear, tapering to a very acute apex, usually to 2-3 x as long as capsule; bracts 1-3 x as long as flowering pedicels var. chalepensis
1. Calyx lobes narrowly oblong-spathulate, subobtuse, ± equal to capsule; bracts ½ - 1 x as long as flowering pedicels var. brevicalyx