Perennials, 10-50 cm tall. Rhizomes transverse. Stems 1 to few, fascicled, erect or ascending, usually unbranched, glabrous. Leaves opposite; petiole 1-2 cm, narrowly winged; leaf blade ovate, rhomboid-elliptic, or elliptic, 3-9 X 1-5 cm, abaxially hispidulous along veins, adaxially glabrous or sparsely hispidulous, margin crenate; veins pinnate, ca. 10 on each side of midrib, abaxially raised. Peduncle 0.2-3 cm; bracts subspatulate-oblong, with flattened membranous glands, margin entire or apically undulate-toothed and ciliate. Flowers axillary, solitary, sessile, usually appearing capitate. Bracteoles absent. Calyx 6-8 mm, without raised veins in fruit or with 5 raised veins and flattened membranous glands, margin ciliate. Corolla purple-red to blue, to 1.6 cm. Style slender, apically cylindric, pubescent, with a membranous auricle on both sides. Capsule pale brown, ovoid, ca. 5 mm. Fl. and fr. Aug-Nov.
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A stout herb. It is an upright plant although sometimes lying over. It is up to 50 cm high. It has a smell. The stems can be simple or branched. It forms roots from the lower nodes. The leaves are opposite and pointed at both ends. Each pair occurs opposite to the next pair. The leaves are slightly rough. They are usually widest near the base and with toothed edges. The stems are hairy. The leaves or the short leaf stalks clasp the stem. Flowers are single without stalks and in the axils of leaves. They are yellowish green. The fruit is a capsule. It is 6.5 mm by 3 mm. Seeds are very small, black and shiny.
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