glabrous, or nearly so, slender, with virgate branches; leaves scattered, lanceolate or linear-lanceolate, 5–7 (rarely 3–9) nerved; flowers solitary, in pairs, or sub-corymbose, on pedicels shorter than the leaves; calyces glabrous. A slender, slightly-branched shrub, 1–3 feet high; branches curved, glabrous or occasionally villous, with long soft white hairs. Leaves 2–4 lines apart, 3/4–1 1/2 inch long, 1/2–2 1/2 lines broad, broadest in the middle. Flowers 5–6 lines long, sub-terminal, either on a short, 2-flowered peduncle, or in a corymbose, 4–6 flowered raceme. Calyx-lobes very variable in length, strongly 3-nerved. Corolla silky-villous. The leaves vary much in comparative breadth; and the inflorescence as above stated; but the species is easily limited by the characters assigned. β. is a very slender variety, with small (3 lines long) pale flowers, and 3-nerved leaves.
