Siskiyou aster

Aster brickellioides Greene var. glabratus Greene, Pittonia 2: 17. 1889; A. siskiyouensis A. Nelson & J. F. Macbride; Eucephalus glandulosus Eastwood

Perennials, 30–60 cm (rhizomes branched). Stems ascending to erect, glabrous or sparsely stipitate-glandular. Leaves: mid and distal blades lanceolate to lance-ovate, 3–6 cm × 5–15 mm, ± glabrous. Heads 3–8 in corymbiform arrays. Peduncles glabrous or sparsely glandular. Involucres campanulate, 8–9 mm. Phyllaries in 3–5 series (sometimes reddish apically), lanceolate to narrowly ovate (unequal), apices acute, abaxial glabrous or sparsely glandular. Rays 0 or 1–2(–4), violet-purple. Cypselae appressed-pilose; pappus bristles in 2 series, ± smooth.

Flowering Jul–Aug. Dry open oak or coniferous forest or chaparral; 700–2300 m; Calif., Oreg.

Eucephalus glabratus is found in the Klamath Mountains of northwestern California and southwestern Oregon. The species is reported to intergrade with E. breweri, E. ledophyllus, and E. tomentellus.