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Erect, annual herb, up to 1 m high; unbranched or branched shortly above base; pubescence on stems appressed-retrorse villous. Leaves subsessile to shortly petiolate; ovate to ovate-lanceolate or oblong-lanceolate, base cuneate, apex acute, margins remotely and sparingly crenate-serrate. Inflorescence 1 or 2(3) spaced verticils; verticillasters of 15-many-flowered, dense, globose clusters; bracteoles many. Flowers white or pale mauve. Calyx widest about middle, symmetrical at mouth, Sub-Equally 5-toothed; teeth deltoid-subulate, spine-tipped. Corolla 2-lipped, often with ring of hair or glands about middle; upper lip slightly arched, lower lip spreading, 3-lobed. Stamens 4, didynamous, inserted near middle of corolla tube. Flowering time Feb.-Apr.? Fruit obovoid triquetrous nutlets.
Annual herb, 0.15-0.70(-1.00) m high. Stems erect, unbranched or branched shortly above base; appressed-retrorse pubescent. Leaves subsessile to petiolate; blade ovate to narrowly ovate, 30-100 x 10-25 mm, apex acute, base cuneate, margins remotely and sparsely crenate-serrate above middle, villous; petioles ± 15 mm long. Flowers: verticils many-flowered, in dense, globose clusters; bracteoles well developed; calyx widest about the middle, 7 mm long at flowering, enlarging 12-15 mm, symmetrical at the mouth, subequally 5-toothed, teeth deltoid-subulate, spine tipped, eventually 3 mm long; corolla with upper lip 3-4 mm long, lower lip 4-5 mm long, white or pale mauve; Nov.-May.
An annual herb. It grows 15-70 cm tall. The leaves are oblong to sword shaped and 3-10 cm long by 1-2.5 cm wide. There are many flowers in rings in round clusters.
