Stems 30-100 cm, branched, glabrous or sparsely villous; branches long and spreading. Leaves alternate, scattered; petiole slender, 5-10 mm, glabrous or sparsely villous; blade ovate or suborbicular, 4-16 × 4-15 mm, abaxially usually glabrous, adaxially sparsely hispidulous, base obtuse, truncate, or subcordate, apex rounded or obtuse. Flowers in dichasia, aggregated at top of main stems and branches, subtended by whorl-like aggregations of 4 or 5 leaves; pedicels 2-4 mm, slender, glabrous. Calyx moderately to densely brown setose; tube subcylindrical, broader toward rounded base, 5-8 × 3-5 mm; lobes usually 5 (some on lower branches with only 4), narrowly triangular, ciliate. Corolla pale blue, cylindrical-campanulate, 14-17 mm, outside glabrous, inside villous near throat; lobes (4 or)5, obovate-oblong, ca. 5 × 1.5-3 mm. Ovary subequaling calyx tube; style exserted above corolla tube. Capsules exceeding calyx at maturity. Seeds ellipsoid, ca. 0.5 × 0.2 mm, both ends acute. Fl. Sep-Oct.
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