Taprooted annual. Stems ascending, with glandular and fine eglandular hairs, 20-40 cm tall. Lvs with glandular and eglandular hairs, green, obovate-spathulate below, lanceolate and acute above, shortly connate in pairs, (10)-15-40 × (5)-8-20 mm. Infl. a lax 5-8-flowered raceme-like monochasium; pedicels erect at flowering, patent or pendent at fruiting, 10-20 mm long; bracts narrow-lanceolate, acute, green. Fls ☿. Calyx cylindric at flowering, clavate, inflated and contracted at mouth at fruiting, often pink, (11)-12-16 mm long, with short dark glandular hairs on the 10 prominent veins, and fine white subappressed eglandular hairs; teeth triangular-obtuse, erect. Petals pink, emarginate; claw lobed at base of limb; coronal scales obtuse, c. 1 mm long. Styles 3, c. 8 mm long. Capsule ovoid, included in calyx; teeth 6; carpophore 3-6 mm long. Seeds blackish, subglobose, warty, c. 1.3 mm long.
Annual herb. Stems branched, glandular pubescent, procumbent to ascending, up to 40 cm. Leaves ovate to narrowly ovate, pubescent, 3-5 by 0.5-1.5 cm, apex rounded to acute, sometimes mucronate. Inflorescence a raceme-like, monochasial, lax cyme; pedicels first erect, later patent or deflexed, 5-10 mm. Calyx obovoid, viscid-pubescent, much inflated in fruit with hyaline bands between the prominent narrow veins, 10-15 mm long, 10-12 mm broad in fruit, teeth short, triangular, obtuse, c. 2 mm. Petals pink (to white). Capsule obovoid-conical, 10-12 mm; carpophore 3-6 mm. Seeds 1.3-1.5 mm, subglobose, dark brown, with convex faces, rugose.
A Mediterranean sp. with horizontal or nodding fls, cal 12–18 mm in fr, the pet notched, occasionally escapes from cult.