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Perennial herb, up to 2 m high; stems stout, 4-angled, erect or ascending, softly woody, sparingly branched, armed with strong retrorse prickles along angles and at nodes, otherwise glabrous. Leaves petiolate, thick textured and somewhat rugose, ovate-deltoid to lanceolate-deltoid, apex acute, base cordate, margins regularly and finely crenate; sparingly hispid to glabrous. Inflorescence lax to fairly dense; verticillasters 4-6-flowered. Flowers red, magenta or purple. Calyx puberulous to hispidulous; teeth lanceolate-acuminate, usually spine-tipped. Corolla minutely pubescent; tube 16-20 mm long, arcuate; upper lip 4-5 mm long; lower lip 6-7 mm long.
Prickly, sprawling perennial to 2 m. Leaves petiolate, ovate, finely toothed. Flowers in sparse verticils, calyx roughly hairy, corolla tubular and twice as long as calyx, red to purple.
A herb.
