A hispid perennial. Stems erect, about 6 in. high, very slender, rigid, leafy throughout. Leaves all opposite, sessile, rigid, thick, ovate-oblong or lanceolate, the largest about 1/2 in. long, equalling the internodes, rather obtuse, entire or furnished with a pair of small teeth near the middle, setulose, especially on the margin and midrib on the underside. Flowers solitary in the axils of the opposite leaves or bracts, very shortly pedicellate; floral-leaves or bracts shorter than the flowers, similar to the leaves; bracteoles linear-lanceolate, about 2 lin. long, setulose. Calyx hispid, about 1/3 in. long, 10-ribbed, nearly equally 5-lobed; lobes oblong, obtuse, shorter than the tube. Corolla about 1/2 in. long, narrow-campanulate, constricted close above the ovary; lobes very short, rounded, notched. Stamens nearly equal; filaments filiform, bearded close under the anthers; anther-cells almost equal, mucronulate.
