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Corolla tube 1.2–1.9 cm. long, glabrescent or pubescent, 0.5–0.9 mm. in diam. at the middle, expanded above to 2–3 mm. wide forming a dilation 2–4 mm. long, lobes 2–6 x 0.8–2.5 mm., oblong-ovate, acute or rounded, glabrous or pubescent; throat and tube densely hairy.
Fruits pubescent 4–5.5 x 3.5–4.5 mm., somewhat constricted above, beak 1–1.5 mm. tall; finally dehiscent into two cocci; the truly terminal solitary one largest, 6 mm. tall and 4.5 mm. wide.
Perennial herb, 0.3-1.0 m high. Leaves narrowly lanceolate. Inflorescence capitate in flower, becoming spicate and laxer in fruit. Corolla tube (10-)14-18 mm long. Flowers white.
Calyx tube hairy, 2 mm. long; lobes unequal, 2.5–16.5 x 1–3 mm., lanceolate to elliptic, pubescent on the face, ciliate at the margins, venation prominent on the back.
Stems woody, about 4 mm. in diam., brown or green above, terete, striate, branched, tomentose with white or brownish hairs; internodes 1.5–17 cm. long.
Style glabrous, exserted 1.25–3.5 mm. or rarely included; stigma lobes often purple, 1.5 mm. long, always exserted.
Perennial herb, 30–100 cm. tall; rootstock little branched, with about three main roots, 6–12 cm. long.
Inflorescence capitate in flower, becoming spicate and laxer in fruit, up to 6 x 4 cm. in extent.
Anthers often purple, 2 mm. long.
Flowers geminate, not dimorphic.
