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

8. Erigeron robustior (Cronquist) G. L. Nesom, Sida. 21: 21. 2004.

White cushion fleabane

Erigeron decumbens Nuttall subsp. robustior Cronquist, Brittonia 6: 174. 1947; E. decumbens var. robustior (Cronquist) Cronquist

Perennials, (15–)25–55 cm (not colonial); taprooted, taproots thin (2–3 mm wide), caudices simple or with relatively slender and short, erect branches. Stems (often purplish) erect or decumbent, sparsely strigillose (basal cells inclined, hairs even-width), eglandular. Leaves basal (often withering by flowering) and cauline; basal blades (3-nerved) linear to narrowly oblanceolate, 90–170 × 3–7 mm, cauline gradually reduced distally, ending proximal to heads, margins entire, faces strigoso-hirsute, eglandular. Heads 1–3. Involucres 6–8.5 × (12–)14–20 mm. Phyllaries in 2–3(–4) series (narrowly oblanceolate to lanceolate, acute-acuminate), sparsely to moderately hirsute to villous, eglandular. Ray florets 21–36; corollas 7–15(–19) mm, laminae white to pinkish, not coiling or reflexing. Disc corollas 3.5–4.5 mm. Cypselae (1.8–)2–3.2 mm, 2-nerved, faces sparsely strigose; pappi: outer of setae , inner of 15–22 bristles.

Flowering Jun–Jul. Rocky or gravelly slopes, sometimes over serpentine, glades and meadows, seeps, sagebrush-scrub, proximal montane coniferous forest; (200–)700–1500 m; Calif.


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