Stems caespitose, 10-30 cm tall, glabrous, simple or with slender branches. Leaves sparse, alternate; petiole 2-5 mm, villous; blade ovate or triangular, 5-13 × 5-11 mm, both surfaces hispidulous, base truncate or obtuse, margin revolute, entire, sinuous, or crenulate, apex obtuse. Flowers solitary, terminal on both main stems and branches, subtended by a whorl-like aggregation of 4 or 5 leaves; pedicels 2-5 mm, glabrous. Calyx with red-brown setae outside, base of setae swollen, often black verrucose; tube cylindrical, 8-10 × 6-9 mm; lobes obovate-oblong or obdeltoid, ca. 1/3 as long as tube, broadest part at or above middle, outside sparsely red-brown setose, inside appressed red-brown villous. Corolla pale or greenish yellow, sometimes blue-or purple striate, cylindrical-campanulate, ca. 2 × as long as calyx tube, outside glabrous, inside densely villous at throat; lobes oblong, 1/3-1/2 as long as tube, apex acute or obtuse. Ovary nearly as long as calyx tube; style extending up to corolla throat. Capsules exserted beyond calyx at maturity. Seeds oblong, ca. 1 × 0.5 mm, obtuse at both ends. Fl. Aug.
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