Erect, tomentose or woolly, tall biennial or perennial herb; leaves alternate, simple, oblanceolate, entire, crenate or irregularly toothed, apex acuminate; flowers bracteate, actinomorphic, yellow, in simple or branched, dense, terminal racemes or spikes; pedicels glandular, pubescent, bracts ovate; calyx campanulate, deeply divided, glandular-pubescent outside; sepals-5, linear-oblong, acute, imbricate; corolla rotate, yellow, lobes 5, rounded; stamens 5, filaments densely bearded, anthers transverse or oblique, cells confluent; ovary 2-4 celled; ovules many style dilated, stigma simple; capsules globose, ovoid or oblong, septicidal, 2 valved, separating from the axis; seeds many, pale yellow, rugose, warted, not winged.