, the only US representative of this small genus, is an unobtrusive, low-growing shrub of desert regions. The slender stems branch profusely, and bear small leaves at closely-spaced intervals, forming rounded clumps. Leaves are mostly opposite but those near the base are often alternate. The blades usually have a few sharp, irregular teeth, or lobes, and are attached by thin petioles, up to ten times longer. Stems and leaves are glandular. Leaves have a midvein, and sometimes a pair of side veins.
Flowerheads contain only disc florets, numbering between 25 and 30, below which are three to four rows of around 25 glandular phyllaries, recurved and darker at the tips. Phyllaries are crossed by one or three lengthwise veins, colored green to reddish. The usual springtime bloom is often followed by a second flowering over the winter.