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DescriptionErect perennial herb, up to 50 cm tall, often forming extensive clumps Leaves alternate or sessile, elliptic-oblong, 4-9 cm long, roughly hairy, particularly on the vains; margins with widely spaced shallow teeth, distinctly wavy. Flowers in terminal heads of several curved, one-sided spikes (scorpioid cymes). Corolla bright purple with an orange-yellow throat. Fruit in small paired nutlets with a rough surface.