Herbs annual or biennial, 30--70 cm tall. Principal roots slender. Stems solitary or sparsely clustered, erect, sparsely branched above, basally shortly pubescent, apically viscid. Basal leaves withered at early anthesis; cauline leaves with short, sterile axillary branches, lanceolate or linear-lanceolate, 2--4(--6) cm × 2--8(--15) mm, abaxially pubescent at midvein, ciliate, midvein prominent. Flowers in a racemiform thyrse; cymules 1-flowered, opposite; peduncles very short. Pedicel 5--20 mm, slender, subglabrous, viscid; bracts linear-lanceolate, ciliate. Calyx tubular to narrowly campanulate, 8--9 mm, ca. 2.5 mm in diam., glabrous. Androgynophore 1.5--2 mm, pubescent. Petal claws narrowly oblanceolate, ciliate at base, auricles not obvious; limbs not exserted beyond calyx, white, shallowly bifid; coronal scales minute. Stamens and styles prominently exserted; filaments glabrous. Styles 3. Capsule globose, 7--8.5 mm, shorter than calyx. Seeds dark brown, globose-reniform, ca. 1 mm. Fl. Jul--Aug, fr. Aug--Sep.
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