Erigeron asperugineus (D. C. Eat.) A. Gray

Erigeron asperugineus sometimes is very similar in aspect to E. clokeyi var. pinzliae; the latter differs in its narrower leaves, coarsely ciliate petioles, broader and non-reflexing rays, and shorter cypselae.

Perennials, 2–20 cm; slenderly taprooted, caudices usually branched. Stems usually decumbent-ascending, moderately to densely hirsutulous to hirtellous (hairs usually deflexed), eglandular. Leaves basal (persistent) and cauline; basal blades 1-nerved or weakly 3-nerved, spatulate, rhombic-elliptic to obovate or oblanceolate (often folding), 20–50(–80) × 3–10(–13) mm, cauline gradually or abruptly reduced and linear distally (bases abruptly contracted to petioles), margins entire, faces moderately to densely hirsutulous, eglandular. Heads 1(–2). Involucres 5–9 × 7–14 mm. Phyllaries in 3–4 series (tips and margins often purple), sparsely to moderately hirsutulous, densely minutely glandular. Ray florets 10–25; corollas deep blue or violet to rose-purple, 5–10 mm, laminae not coiling or reflexing. Disc corollas 4.2–6.3 mm. Cypselae 2.5–3.1 mm, 2-nerved, faces sparsely strigose; pappi: outer of setae, inner of 20–30 bristles.

Aster asperugineus D. C. Eaton in S. Watson, Botany (Fortieth Parallel), 142. 1871

Erigeron asperugineus, the Idaho fleabane, is a species of flowering plant in the family Asteraceae. It is native to the Western United States, particularly the states of Montana, Idaho, Utah, and Nevada.

Erigeron asperugineus is a small perennial herb up to 20 cm (8 inches) tall, the stems mostly leafless and often lying flat. The basal leaves have short hair with meandering margins and are wider towards the tip. One plant usually produces 1 or 2 flower heads, each with 10–25 blue, pink, or purple ray florets about 1 centimetre (1⁄2 in) in length and surrounding many yellow disc florets.

Erigeron asperugineus là một loài thực vật có hoa trong họ Cúc. Loài này được (D.C.Eaton) A.Gray mô tả khoa học đầu tiên.