Annual, usually glandular-pubescent, (10-)20-50 cm tall, often regularly and branched from below with elongated branches. Scales distant, 5-15 mm long, lanceolate, thickish, pubescent to glabrescent. Spikes lax, with lower flowers distant and subsessile, up to 25 cm long, hardly or not tapering above. Bracts lanceolate to ovate-oblong, hardly reaching the size of calyx, ± similar to scales. Bracteoles linear, shorter than calyx. Calyx 8-14 mm long, campanulate, more dissected dorsally, 4(-5)-toothed, with teeth ± as long as the tube, pubescent. Corolla usually 20-35 mm long, pubescent out-side, infundibuliform, ± whitish below and blue or lilac above; tube slightly curved and broader above, constricted below the middle and at the insertion point of stamens; upper lip short, 2-lobed, erect; lower lip ± equally 3-lobed with rounded or subrounded lobes; margins very minutely denticulate to almost entire. Staminal filaments ± pubescent at base; anthers cells woolly along the sutures. Stigma with 2, semiorbicular lobes. Capsule c. 10 mm long, oblong to subspheroid, acuminate, glabrous; seeds c. 0.7 mm long, subglobose to broadly ovoid, reticulate.