Herbs annual. Stems numerous, (6-)22-40 cm, erect or ascending, minutely retrorse hairy, purplish. Basal cauline leaves withering early; petiole as long as blade, shorter upward; leaf blade ovate-triangular, base cordate, margin remotely crenate, apex rounded; upper blades lanceolate to linear-lanceolate, 1.4-4 × 0.4-1.2 cm, yellow glandular, veins sparsely minute hairy, base rounded to broadly cuneate, margin triangular-dentate or sparsely serrate, with basal teeth sometimes lobelike, apex long spiny, obtuse. Verticillasters 4-flowered, loose, in 5-12 upper nodes of stems and branches; bracts oblong, shorter to slightly longer than calyx, margin 2-or 3-spinescent-denticulate, with spines 2.5-3.5 mm, sparsely appressed hairy. Pedicel 3-5 mm, horizontal after anthesis. Calyx 8-10 mm, golden glandular, pubescent especially basally, purple veined, 2-lipped to 1/2 its length; upper lip teeth divisions 1/4-1/3 of lip, teeth subequal, triangular-ovate, apex acute. Corolla bluish purple, 1.5-2.5 (-3) cm, dilated beyond throat, white pubescent outside; upper lip short navicular, ca. 1/4 as long as tube; middle lobe of lower lip dark purple spotted. Nutlets oblong, ca. 2.5 mm, apex truncate, smooth.
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An annual herb. It has many branches. It grows 15-25 cm high. The leaves are sword shaped and have teeth along the edge. They are 1-4 cm long by 1 cm wide. The flowers are white or violet and in rings.
With lax, narrowly leafy-bracteate infl and large cor 2–2.5 cm much exceeding the cal, has been reported as casually adventive
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