1. Gamochaeta argyrinea G.L. Nesom

Pl. 295 d; Map 1135

Plants usually fibrous-rooted, rarely with slender taproots. Stems 10–35(–45) cm long. Basal leaves usually present at flowering. Leaves 1–6 cm long, oblanceolate to oblong-oblanceolate, the upper ones sometimes linear, strongly bicolorous, the upper surface sparsely woolly or with patches of cobwebby hairs, sometimes appearing nearly glabrous, the undersurface densely woolly, the undersurface hairs with a slender, unexpanded basal cell (even with magnification). Involucre 3.0–3.5 mm long, the outermost bracts ovate to narrowly ovate with sharply pointed tips, the innermost oblong to oblong-elliptic, rounded to truncate at the tip, sometimes with a minute, abrupt, sharp point. Receptacle flat or slightly convex at flowering, usually becoming shallowly concave at fruiting. April–June.

Uncommon, known thus far only from Howell County (southeastern U.S. west to Kansas and Texas; Puerto Rico). Pastures.

This species was described only recently (Nesom, 2004a) and is known thus far from one site in Missouri. Because it has not been searched for elsewhere in southern Missouri, its range and native habitat are not yet known. The stem leaves tend to be narrower and less spatulate than those of the morphologically similar G. purpurea.