Stems erect, 15-30 cm tall, simple or branched, winged, glabrous. Leaves alternate, subsessile to short petiolate; leaf blade broadly linear to elliptic, 4-11 X 0.5-2 cm, glabrous, base attenuate, margin serrate to dentate and with ascending teeth tips, apex acute to acuminate. Racemes terminal on main stems and leafy branches, 1.5-4.5 cm; bracts subulate-lanceolate, 3-5 X ca. 1 mm. Calyx glabrous; lobes subulate-lanceolate, 3-4 X ca. 1 mm. Corolla greenish to yellowish or purplish, ca. 3 mm, pubescent; tube as long as limb; limb actinomorphic. Stamens nearly as long as corolla; filaments hairy. Capsule ovoid-globose, 3-4 mm, glabrous. Fl. Jul-Aug.
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