Rhizomes robust, short, producing dense, fibrous rootlets and numerous stems. Stems erect, 13-28 cm, ± unbranched, retrorse pubescent, nodes numerous, internodes 1-1.4 cm. Leaves pinnatisect, subsessile, basal sheath less than 1 mm; leaf blade obovate, 1.6-2.2 × 1.4-2 cm, adaxially glabrous, abaxially glabrescent; segments in (1 or) 2 or 3 pairs, inserted near midrib base, sub-erect at an acute angle, linear, 0.8-2.1 cm × 1-1.2 mm. Verticillasters 2-flowered, on 5-10 upper nodes, crowded; floral leaves similar to cauline leaves but reduced, with 1 pair of sections, 1/2-2/3 as long as calyx. Calyx 1.6-1.8 cm, densely pubescent, ciliolate, 2-lipped 2/5-3/7 its length; teeth lanceolate, apex subulate-acute, upper lip teeth divisions 4/5 its length, teeth subequal but middle tooth slightly longer. Corolla blue-purple, 2.5-2.8 cm, pubescent. Fl. Aug-Sep.
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