Erigeron arenarius Greene, Bull. Torrey Bot. Club 25: 121. 1898

Stems moderately to intricately branched; proximal mostly 1–2(–2.5) mm wide. Leaves: basal and proximal cauline blades oblanceolate, 20–40 × 3–8 mm, margins deeply dentate to pinnately lobed.

Flowering Mar–Jun (or sporadically with rain). Open habitats in deep, loose sand, sometimes with oaks; 800–1300 m; N.Mex., Tex.; Mexico (Chihuahua).

Intergrades between var. arenarius and var. robustus occur in Ward and Winkler counties, Texas.