Low perennial herbs with mostly basal leaves, reproducing by stolons. Basal leaves spatulate, stem leaves elliptical. Flowers terminal in bracteate spikes. Calyx campanulate the lobes more or less similar. Corollas blue, weakly 2-lipped. The upper lobes much shorter than the lower 3 lobes, the latter reflexed. Stamens 4, didymous, the upper pair somewhat longer than the lower. Ovary weakly 4-lobed, the style terminal. Base chromosome numbers, x = 14, 15, 16.
The generic name derives from the Greek meaning "without a yoke," in reference to a yoke-fellow to the lower lip of the corolla (Fernald, 1950). A genus of about 40 species native to the Old World, several of these now widely distributed in the temperate regions of the New World where introduced.
Introduced into Texas as a weed within the last half century, perhaps persisting, although known by relatively few collections; spring flowering.
Fernald, M. L. 1950. Ajuga, in Gray's Manual Botany. 1216.
AJUGA REPTANS L., Sp. Pl. 561. 1753.
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