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DescriptionErect annual herb, 0.6-2 m; stems scabrid to hispid or hairy. Leaves ovate, obovate or ovate-lanceolate below, narrower above, sessile, often ± amplexicaul, serrate. Inflorescence of numerous spikes, usually arranged in dense groups of 3. Bracts purplish, lanceolate, 2.75-4 mm. Calyx purplish. Corolla purple or magenta; tube 5.5-7 mm, exserted for c.1/2 of its length.