Herbs perennial, 30--100 cm tall, with creeping rhizomes. Stems erect, simple or branched in upper part, with dense multicellular tangled hairs. Leaves alternate or subopposite, subsessile, oblong-lanceolate to oblanceolate or linear, 4--10 X 0.6--2.2 cm, abaxially more densely so, epunctate, adaxially pubescent, tapering at base, apex obtuse to acute. Racemes 4--6 cm, elongating to 30 cm in fruit, densely flowered; bracts linear-subulate, ciliate. Pedicel 4--6 mm, usually slightly shorter than bracts, pubescent. Flowers often secund. Calyx lobes oblong, 3--4 mm, margin membranous, apex rounded. Corolla white; tube ca. 2 mm; lobes oblong-spatulate, 5--8 X ca. 2 mm, often dark purple glandular striate, apex obtuse to slightly emarginate. Stamens included; filaments adnate to corolla tube, free parts ca. 3 mm, glandular puberulent; anthers elliptic, dorsifixed, ca. 1 mm. Ovary glabrous; style 3--3.5 mm. Capsule subglobose, 2.5--4 mm in diam. Fl. May-Aug. 2n = 24@.
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A herb. It keeps growing from year to year. It grows 30-100 cm tall. It has creeping rhizomes. The stems have tangled hairs. The leaves are alternate and 4-10 cm long by 1-2 cm wide.
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