Herbs glabrous, 20--80 cm tall. Stems 2 to many, erect, terete at base, upper part with raised lines descending from bases of leaves, sparsely black glandular striate. Lowest leaves usually scalelike. Leaves alternate or subopposite on lower part of stem, occasionally in whorls of 3 or 4, sessile or subsessile, lanceolate to narrowly lanceolate, 4--14 X 0.9--2.3 cm, densely black glandular punctate and striate, base cuneate to subrounded, apex long acuminate; veins ca. 5 pairs. Pedicel 1.5--5 cm. Flowers solitary, in axils of upper leaves, rarely aggregated at apex, racemose from reduction of upper leaves to bractlike leaves; bracts inserted on rachis. Calyx lobes narrowly lanceolate, 7--11 X 1--2 mm, black glandular punctate, narrowly hyaline margined; veins 3--5. Corolla yellow, ca. 1 cm; tube 3--5 mm; lobes broadly ovate, ca. 5 mm wide, black glandular striate. Filaments connate basally into a ca. 2.5 mm high tube, free parts 2.5--4 mm; anthers oblong, dorsifixed, opening by lateral slits, 1.2--2 mm. Ovary ovoid; style 6--7 mm. Capsule subglobose, 3.5--5 mm in diam., elongate, black glandular. Fl. May.
Home