Slender undershrub, 60-100 cm, often branched. Stem and branches acutely 4-angled, pubescent. Leaves thin-membranaceous, lanceolate, narrowly ovate to ovate, 3-4(-5) by 1.5-2(-3)cm, acute or caudate, base rounded or acute, more or less entire, margin elsewhere crenate or remotely serrate, often only few-toothed; puberulent on both surfaces; petiole 1-3 cm, hirsute. Flowers in terminal, sometimes also in upper axillary, lax, pseudo-racemes 8-10 cm long; rachis glandular-hairy, often 2 flowers in a whorl, secund. Pedicels obliquely attached (in angles of 60° to 75°) to the rachis. Calyx campanulate, 3-4 mm long, in fruit 5-6 mm, hirsute. Corolla trumpet-shaped, blue or white, 14-16 mm long, puberulent, upper lip notched. Nutlets broadly oblong, flattened, 1.5-1 mm long, black, finely tuberculate and puberulent.
Open primary, often light forest, forest-edges, trails, in Tondano in coffee-estates, near Moresby in Eucalypt savannah and in Daru I. on damp soil in savannah forest; from low altitude to c. 2300 m, in Java not below 600 m. Fl. Jan.-Dec.
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