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

46. Erigeron argentatus A. Gray, Proc. Amer. Acad. Arts. 8: 649. 1873.

Silver fleabane

Perennials, (8–)15–30(–40) cm; taprooted, caudices branched, retaining old leaf bases. Stems erect, densely gray-green to silvery-strigose (hairs white, closely appressed), eglandular. Leaves basal (persistent) and cauline (leaf bases broadened or not, not thickened and whitish-indurate); basal blades spatulate to oblanceolate or narrowly oblanceolate, (15–)20–50(–70) × 1–4(–6) mm, margins entire, faces silvery-strigose, eglandular ; cauline blades linear to linear-oblanceolate, much reduced distally. Heads 1. Involucres 5.5–9 × (10–)12–22 mm. Phyllaries in 3–4 series, silvery-strigose (hairs closely appressed), minutely glandular. Ray florets 20–50(–75); corollas blue to lavender, less commonly pink or white, 9–15 mm, laminae coiling. Disc corollas 3.8–5.6 mm. Cypselae (terete to slightly compressed) 2.8–3.4 mm, 6–8-nerved, faces strigoso-pilose; pappi: outer of setae or lanceolate scales, inner of 25–40 bristles. 2n = 18.

Flowering May–Jul. Ridges and slopes in dry, sandy or gravelly soil, desert shrub, sagebrush, juniper and pinyon-juniper; 1300–2500 m; Ariz., Calif., Nev., Utah.


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