Low herb or undershrub. Stem soft woody, prostrate and rooting below, densely leafy above. Leaves thin chartaceous, elliptic to broadly elliptic, 15-20 by 10-12 cm, obtuse, base broadly acute or subtruncate, at margin irregularly serrate or doubly serrate, hirsute and strigose on both sides, especially along the nerves; petiole 3-4 cm, hirsute and strigose. Compound cymes dichotomously branched, with terminal flowers; flowers on the branches secund; peduncles slender, 6-8 cm. Bracteoles subulate, shorter than the pedicels. Pedicels slender, strigose, 2-3 mm long. Calyx campanulate, 2.5-3 mm long, in fruit 3-4 mm; teeth triangular, subequal in length, ciliate. Corolla pale sulphur, endlobe white, tube dark red, 6-7 mm long, glabrous; upper lip suberect or recurved 2-lobed, lobes oblong; lower lip spreading, 3-lobed, midlobe very large, obovate to orbicular. Anthers 2-celled, at length confluent; filaments exserted, hirsute only at base, glabrous elsewhere. Nutlets, obovoid, subtriquetrous, 1.2-1.5 by 1 mm, rugose, sparsely hirsute.
Undergrowth in dipterocarp forest on y distinctly sandy soil at the foot of quartzite ridges (Klang Gates). As REID ( REID Mal. Nat. J. 14 1959 27 ) pointed out former records from limestone rest on an error through confusion with the nearby limestone of Bt. Takun. A rare lowland plant. Fl. Jan.-Febr.
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