Perennial semi-succulent herb; stems erect to decumbent, 0.5-1.5 m tall, sparsely to densely tomentose. Leaves petiolate; blade medium-to thick-textured, ovate to subrotund, (35-)40-105 x (25-)30-100 mm, sparingly strigose to densely woolly-tomentose, gland-dotted, apex acute to rounded, base cuneate to subcordate, margin shallowly to fairly distinctly crenate-dentate; petiole 10-40 mm long. Inflorescence terminal, simple or with 1-2 pairs of branches near the base, racemes 80-500 mm long; bracts usually early deciduous but sometimes persisting to the flowering stage (in var. tomentosus); flowers in sessile 4-15-flowered cymes, forming 8-25-flowered verticils; verticils 10-30 mm apart; pedicels 2-4 mm long. Calyx 5 mm long in fruit, glandular-scabrid, shape as in P. dinteri. Corolla usually shades of mauve to purple, rarely white, 7-13 mm long, finely pubescent and gland-dotted on the lips; tube expanding gradually from the base and bent about the middle; lower lip boat-shaped, 4-7 mm long. Stamens free to the base, 5-8 mm long.
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