Isodon

Perennial herbs or subshrubs, much branched; stems and branches acutely quadrangular. Leaves shortly petiolate to subsessile, ovate to oblong-ovate, acute, rounded at base, dentate to crenulate. Inflorescences ample, dichotomously branched, axillary and terminal panicles; bracts not sharply differentiated from leaves; bracteoles linear, very small. Calyx urceolate-campanulate, sometimes obscurely separated into a 3-toothed upper lip and a 2-toothed lower lip; teeth subequal, triangular. Corolla 2-lipped; tube relatively straight, not markedly ventricose or saccate at base; upper lip reflexed, 4-fid at apex, lower lip broadly ovate, almost flat. Stamens 4, declinate; posterior one arising near base; anterior one arising at mouth of corolla tube, exserted; filaments all free to base; anthers synthecate, ovate. Style far exserted; stigma minutely 2-lobed.