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A scabrous much-branched herb or undershrub, 1–2 ft. high. Branches slender, quadrangular, rough with retrorse bristles tubercled at the base. Leaves all opposite, linear-oblong, 3–10 lin. long, acute. Flowers solitary in the axils of the leaves and bracts, about 1/2 in. long. Pedicels 2 lin. long. Bracteoles 2, linear, close under the calyx and shorter than the tube. Calyx scabrous with retrorse hairs, campanulate, 2–2 1/2 lin. long, nearly equally 5-lobed; lobes ovate, scarcely acute, somewhat shorter than the tube, hairy on both sides. Corolla oblique, 7–8 lin. in diam., hairy outside, glabrous within, inflated from the base; limb nearly equally 5-lobed, lobes rounded. Stamens included, glabrous, very similar to those of P. obtusifolia; anthers shorter (?) than the filaments. Ovary and lower part of the style pubescent. Style longer than the stamens. Capsule coriaceous, pubescent, spheroidal, laterally compressed nearly twice as long as the persistent calyx, 3–4 lin. long and broad, 2-valved. Seeds numerous, variable in shape, about 1/2 lin. long, punctate.