grows taller than many other species in this genus, up to 2 feet. Stems usually branch, at intervals all the way from the base to near the tip. All branches are covered by hairs, some lying flat against the surface, others pointing outwards. Leaves are generally alternate; they are narrow, linear in shape, have one central vein, and are covered by bristly hairs (especially along the edges), angled outwards and slightly upwards.
Flowers are borne along the upper few inches of the stalks; some right at the tip, others just below, singly or in groups of 2 or 3. The corolla is white, while the appendages (raised protrusions at the base of the corolla lobes) may be white or yellowish. The corolla tube is enclosed by five green sepals, covered by short hairs and longer bristles.