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Cal nearly regular, the 15-nerved tube somewhat oblique at the throat, the 3-nerved lobes about alike; upper cor-lip directed forward, shallowly 2-lobed, the lower lip 3-lobed, its central lobe expanded and decurved, but its lateral lobes displaced onto the summit of the cor-tube; stamens 4, exsert, the 2 lower curved upward under the upper cor-lip, the 2 upper longer and downcurved; pollen-sacs parallel or nearly so; nutlets minutely hairy at the tip; perennial herbs with numerous rather small fls crowded in dense verticils subtended by inconspicuous bracts, forming terminal, continuous or interrupted spike-like infls. 20, N. Amer. and se. Asia.
