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

155. Erigeron lobatus A. Nelson, Amer. J. Bot. 21: 580. 1934.

Lobed fleabane

Annuals, mostly 10–40(–50) cm; taprooted. Stems erect, sparsely hispido-pilose (hairs spreading, straight, 0.6–2) mm), densely stipitate-glandular. Leaves basal (persistent) and cauline; basal and proximal cauline blades obovate-spatulate, 50–100(–150) × 4–25 mm, cauline gradually reduced (lobing distally), margins pinnatifid or bipinnatifid with (1–)2–4 pairs of rounded to acute lobes, faces sparsely hispido-pilose, stipitate-glandular. Heads 1–5 (peduncles long, ebracteate). Involucres 3–4 × 6–10 mm. Phyllaries in 2–3 series (sometimes basally connate, broad, thin) sparsely hispido-pilose, stipitate glandular. Ray florets 85–110; corollas white, drying dark blue, 6–9 mm, laminae not coiling or reflexing. Disc corollas 1.8–2.9 mm. Cypselae 1.2–1.4 mm, 2-nerved, faces sparsely strigose; pappi: outer of scales (sometimes connate, forming crowns), inner of 11–12 bristles.

Flowering (Jan–)Feb–May(–Oct). Stream banks, sandy lake shores, dry washes, desert or riparian scrub, sometime with creosote bush; 300–1200 m; Ariz., Calif., Nev.; Mexico (Sonora).

Erigeron lobatus is characterized by persistent basal and proximal cauline leaves with rounded to acute lobes, vestiture of stipitate glands and sparse, spreading, hispido-pilose hairs, heads on relatively long, ebracteate peduncles, and broad, thin phyllaries. Erigeron divergens often is similar; its glandularity is not stipitate and its nonglandular hairs are shorter and denser.


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