Perennial; stems 1.5–6 dm, smooth, or hairy at and below the nodes; lvs in 4’s, lanceolate or lance-ovate, 3–6 cm, 3–4 times as long as wide, acute or acuminate, 3-nerved, hairy on the veins and margins; infls 1–4 from each of the upper 1–3 nodes, divaricately branched; cor purple; fr smooth or granular, 3–4 mm; often only one carpel fully developed, the other maturing into a small elaiosome. Dry woods in the mts.; Pa. to Va. and Ky., s. to Ga. and Ala. June, July. Hairy-stemmed plants have been called var. hispidum Small, in contrast to the smooth-stemmed var. latifolium.
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