Herbs, weak to erect, 1-2 m tall; stems quadrangular, densely hirtellous. Leaves opposite, distributed along stems; petiole usually 0.5-1.5 cm, densely hirtellous; blade drying papery, black adaxially, dark brown abaxially, narrowly elliptic to lanceolate-elliptic, 4-12 × 1.5-4 cm, adaxially sparsely strigose to glabrescent, abaxially glabrescent except multicellular villous along principal veins, base cuneate, margins densely multicellular-ciliate, apex acuminate or caudate-cuspidate; secondary veins 9-12 pairs; stipules persistent, ovate or lanceolate, 8-9 mm, densely striate veined. Inflorescences terminal, subcapitate, densely multicellular villous with trichomes drying brown; peduncle shorter than 1 cm. Flowers subsessile. Calyx multicellular villous; hypanthium portion obconic, ca. 1.5 mm; limb lobed for ca. 1/2; lobes narrowly triangular, ca. 4 mm, acute. Corolla white, tubular, densely multicellular tomentose or-pilosulous outside with trichomes drying brown; tube 15-16 cm, inside upper part white villous; lobes triangular-lanceolate, 4-5 mm, acute. Capsules obconic, 5-6 mm, with persistent calyx lobes to 3 mm. Fl. May, fr. Jul.
Home