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Sichuan, Guizhou, Guangxi, and Guangdong provinces in China, growing on rocky slopes, under forests, and along ditches at elevations of 530-1300 meters.
The flowers are purple or purplish-red, with a corolla tube extending slightly beyond the calyx, lips 3-lobed with the middle lobe inverted-heart shaped and side lobes ovate-triangular.
Var. erythrophylla often has larger leaves mostly basal, usually pinnate compound with 1-2 pairs of leaflets, occasionally simple, with serrate margins. The undersides are purple and both surfaces are sparsely to nearly hairless.