Profusely branched, erect perennial, woody only at very base; stems 20-80 cm long; leaves triangular-ovate or triangular-lanceolate, 1-2.5 times longer than wide, 5-40(80) mm long, dull to bright green above, paler below, thinly pubescent; flowers pink or dull rose-purple, 6-9 mm long, in whorls in interrupted spikes, zygomorphic, petals 5, fused into a tube, the two small upper petals extending forward much like the visor of a cap, the three larger lower petals forming a reflexed lip; fruit dividing into 4 dark nutlets each about 1-1.5 mm long. Flowers August to October.