Herb or subshrub softly woody in lower parts, ± glandular-pubescent, up to 3 dm. tall. Stems laxly branched, slender, sprawling to scandent, up to ± 5 dm. long; branches very slender, finely striate. Lvs opp.; lamina thin to very thin, (2)-5-(8) × 2-3-(5) cm., of ovate order (varying on the same plant from narrow- to broad-ovate to ovate-oblong to ovate-elliptic, some plants more regular as to main shape), apiculate, coarsely 2-3 crenate-serrate, occ. lobed, abruptly narrowed into slender petiole ± 1-8 cm. long, often bearing minute lflts in axils. Infl. a slender, terminal, us. several-fld panicle, ± trichotomously branched, up to c. 15 cm. long. Pedicels often capillary, up to c. 2 cm. long. Calyx subcampanulate, c. 2 mm. long, deeply cut into ovate to deltoid lobes. Corolla white to yellow-flushed, spotted purple, puberulous, divided c. 1/3 to 1/2 way into 2 nearly equal concave lips c. 5-10 mm. long. Anthers suborbicular, filaments short. Capsule obovoid, c. 4 mm. long.

2n = 36

n = 18