Shrubs, evergreen, 1.5–4 m. Stems erect, not rooting at nodes; branchlets light green or grayish green and glaucous, thorn-tipped, round in cross section, rigid, glabrous. Leaves: petiole 3–7 mm; blade flat, ovate to oblong-elliptic, 5–30 × 3–15 mm, base rounded to subcordate, margins usually entire to minutely glandular-serrulate, rarely serrate, glands 16–20, apex acute to obtuse, abaxial surface grayish green, glaucous, glabrous, adaxial surface green, ± glaucous, dull, usually glabrous, sometimes appressed villosulous; 3-veined from base. Inflorescences axillary, usually paniclelike, sometimes racemelike, (3–)5–15 cm. Flowers: sepals, petals, and nectary white to blue. Capsules 3–5 mm wide, lobed; valves smooth, viscid, not crested. 2n = 24.
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