Linaria arvensis

Erect glaucous annual 10–40 cm high, simple or much-branched, glabrous except for glandular-hairy inflorescence. Leaves whorled below, alternate up stem, linear to narrow-elliptic, 0.4–3.5 cm long, 1–2 mm wide. Inflorescence many-flowered, at first dense, elongating in fruit; bracts 1–3 mm long; flowers c. sessile, pedicels 1–2 mm in fruit. Sepals 2 mm long, c. 3 mm in fruit; corolla 3–4 mm long, pale blue to purple, palate at least sometimes white, spur at right-angles to tube, 1.5–3 mm long, curved, upper lip pointed outwards, lower lip longest, recurved. Capsule c. globose, 3–4 mm long, glabrous, breaking in apical half into 4–6 valves; seeds winged. Flowers mostly spring.