Herbs biennial or perennial, glabrous, 30--50 cm tall. Stems erect or diffuse, usually branched from base; branches flagelliform, elongate. Leaves alternate, sessile or subsessile, narrowly elliptic to oblanceolate or spatulate, 10--45 X 5--10 mm, sparsely dark purple or black glandular punctate, base cuneate, apex acute to obtuse. Racemes terminal, 4--8 cm; bracts subulate, 5--10 mm. Lowest pedicels to 1.5--2 cm, gradually reduced upward. Calyx lobes narrowly lanceolate, ca. 5 mm, abaxially black glandular punctate, hyaline margined. Corolla white, narrowly campanulate; tube ca. 4 mm; lobes oblong, 4--5 X 1.5--2 mm, epunctate, apex obtuse. Stamens included; filaments adnate to lower part of corolla lobes, free parts ca. 2 mm; anthers narrowly oblong, dorsifixed, 1.5--2 mm. Ovary ovoid; style ca. 6 mm. Capsule subglobose, ca. 3 mm in diam. Fl. Apr-Jun.
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