Roella arenaria Schltr.

Stems decumbent, prostrate or sprawling, up to 40 cm. long, branched mostly from the base. Leaves crowded, fasciculate, linear, ciliate, 0-5-1 cm. long, often with a few lateral teeth. Flowers solitary. Bracts crowded, squarrose or the lower reflexed, more rigid than the leaves and more toothed. Calyx densely covered with very short hairs, the lobes 0-6-lcm. long, 2-2-5 mm. wide, flat, acute, with coarse pinnate teeth. Corolla white, 1-1-5 cm. long, the acute lobes longer than the tube, the tube shorter than the calyx. Ovary hairy.