An erect scabrid herb, drying black. Stem somewhat tetragonous; internodes 1/2– 3/4 in. long. Leaves opposite, sessile, linear or linear-oblong, about 1/2 in. long, obtuse. Bracts similar to the leaves but smaller. Flowers solitary in the axils of the leaves or bracts, rather large for the genus. Pedicels 2–3 lin. long. Bracteoles 2, opposite, about 1 1/2 lin. long, not close to the calyx as in most species. Calyx broadly campanulate, about 5 lin. long, obscurely nerved, glabrous; lobes triangular, acute, shorter than the tube. Corolla glabrous, nearly 1 1/4 in. long and across; tube cylindrical at the base and suddenly inflated; limb 2-lipped; upper lip emarginate, lower shortly 3-lobed; lobes all rounded and undulated. Stamens included. Anther-cells oblong, tapering upwards, dehiscing by a terminal pore; abortive cell of the lower pair and connective about 2 1/2 lin. long. Ovary ovoid, glabrous; style included.