Diaperia prolifera var. barnebyi
Novon 14: 470. 2004.
Plants silvery white, 3–9 cm, tightly sericeous. Stems mostly 1–5; branches equal to unequal, distal strictly ascending to erect. Leaves: largest 7–11 × 2–3 mm; capitular leaves erect, involucral, proximally carinate, becoming indurate. Heads borne singly, or 2–3 in largest glomerules. Receptacles narrowly conic, 0.9–1.1 mm, heights mostly 2–2.4 times diams. Pistillate paleae: longest 2.5–3.2 mm.
Phenology: Flowering and fruiting mid Apr–mid Jun.
Habitat: Open, dry, shallow rocky or gravelly soils, usually over limestone or gypsum, sometimes with extra moisture (dry drainages, disturbed places)
Elevation: 500–1500 m
N.Mex., Okla., Tex.
Variety barnebyi is not particularly weedy. It occurs in southwestern Oklahoma, southeastern New Mexico, and western Texas (nearly to Mexico), largely allopatric with var. prolifera.