Herbs, perennial, erect to procumbent, to 1 m tall; stems terete to flattened or ridged, often sulcate, glabrous or sometimes sparsely hirtellous to puberulent near nodes. Leaves sessile or petiolate; petiole to 12 mm; blade drying papery, lanceolate, elliptic, ovate-lanceolate, or rarely ovate, 4-11.5 × 1-4 cm, adaxially glabrous or sparsely to moderately strigillose, pilosulous, pilose, or hispid, abaxially glabrous except usually densely puberulent, hirtellous, or pilosulous on principal veins, base obtuse to acute, apex acute to acuminate; secondary veins 4-9 pairs; stipules rounded to broadly triangular, 1-2.5 mm, puberulent, hirtellous, or glabrescent, with 3 to numerous setae or linear lobes 3-15 mm, glabrous to ciliolate, often inserted below top of sheath. Inflorescences terminal, subterminal, or pseudoaxillary, cymose, lax, dichasial with axes often asymmetrical, branched to 2-4 orders, glabrous; peduncle 1-4.5 cm; bracts stipuliform to reduced and erose or ciliate, 0.2-1.5 mm; pedicels to 0.5 mm. Calyx glabrous; hypanthium portion obconic, 0.8-1 mm; limb divided to base; lobes narrowly triangular, linear, or narrowly ligulate, 1.2-2 mm, entire to ciliolate. Corolla white, funnelform, outside glabrous; tube 4-6 mm, apparently pubescent inside; lobes narrowly triangular to ligulate, 2.5-3 mm, often puberulent adaxially. Capsule compressed globose, ca. 2 × 3 mm, slightly dicoccous, glabrous, with calyx lobes often elongating, to 4 mm, with pedicels sometimes elongating, to 2 mm. Fl. Jun-Sep, fr. Jul.
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