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FNA | Family List | FNA Vol. 20 | Asteraceae | Erigeron

141. Erigeron coulteri Porter in T. C. Porter and J. M. Coulter, Syn. Fl. Colorado. 61. 1874.

Coulter’s fleabane

Perennials, 10–70 cm; rhizomatous, fibrous-rooted, sometimes with branched caudices and scale-leaved stolons. Stems erect, sparsely hispido-villous (hair cross walls sometimes black), often glabrate, eglandular. Leaves basal (persistent or not) and cauline; proximal blades broadly oblanceolate to elliptic or oblong-lanceolate, 40–120(–150) × 7–25 mm, margins entire or with 1–5 pairs of shallow teeth, faces sparsely strigose to strigoso-villous, eglandular; cauline blades becoming elliptic-ovate to lanceolate, gradually reduced distally (bases usually claspi ng). Heads 1(–4). Involucres 7–10 × 10–16 mm. Phyllaries in 2(–3) series, hirsuto-villous (hair cross walls black), minutely glandular. Ray florets 45–140; corollas 9–25 mm, laminae coiling, white. Disc corollas 3–4.4 mm. Cypselae (1.3–)1.5–1.8 mm, 2-nerved, faces sparsely strigose; pappi: outer of setae, inner of 20–25 bristles. 2n = 18.

Flowering (Jun–)Jul–Sep. Moist coniferous woods, moist to wet meadows, open areas along creeks, aspen, spruce-fir; 1800–3700 m; Calif., Colo., Idaho, Mont., Nev., N.Mex., Oreg., Utah, Wyo.


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