Robust erect herb up to 1.4 m tall from a creeping rootstock; stems usually simple, coarsely tomentose, gland-dotted. Leaves: the lower shortly petiolate, the upper subsessile; blade runcinate or pinnatifid, 50-95 x 40-50 mm, with a terminal segment of c. 60 x 50 mm, shortly appressed pubescent, apex subacute to obtuse, margin irregularly and coarsely serrate. Inflorescence of many verticils, spaced below, denser above; verticils 8(-24)-flowered. Calyx shortly hispid, tubular-campanulate, up to 10 mm long in fruit, upper lip with 3 acuminate teeth, the 2 outer teeth c. 2.5 mm long and the central tooth shorter, 1.5-2 mm long. Corolla blue, mauve or reddish, c. 13 mm long; tube straight c. 10 mm long; upper lip straight, 3 mm long; lower lip slightly shorter.
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