Annual or weak perennial, erect, branching, semi-succulent herb, 0.15-0.4 m tall; stems villous. Leaves petiolate; blade slightly fleshy, oblanceolate, obovate-oblanceolate, elliptic or ovate-lanceolate, 30-55 x 25-35 mm, sparingly pubescent, under-surface with reddish gland-dots and short gland-tipped hairs, apex acute to obtuse, base cuneate, margin subentire to obscurely few-toothed; petiole 4-20 mm long. Inflorescence a terminal, dense, spike-like raceme 25-90 mm long, simple or occasionally with a pair of branches near the base; bracts forming a 4-angled apical coma, early deciduous; flowers in 3-4-flowered sessile cymes, forming 6-8-flowered closely placed verticils; pedicels erect. Calyx 5 mm long in fruit, similar to P. tetensis. Corolla blue-purple, 8-10 mm long; tube slightly geniculate and expanding about the middle; upper lip 1.5 mm long, lower lip boat-shaped, 5-6 mm long. Stamens 5-6 mm long, united at the base for 1.5 mm.
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