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

138. Erigeron glabellus Nuttall, Gen. N. Amer. Pl. 2: 147. 1818.

Streamside fleabane

Biennials or perennials, 7–50(–70) cm; rhizomatous, caudices or rhizomes relatively short and thickened, simple or branched, usually appearing merely fibrous-rooted. Stems erect or slightly basally ascending, hirsute or hirsuto-villous to strigose or glabrate, eglandular. Leaves basal (persistent) and cauline; basal blades oblanceolate to oblanceolate-spatulate, 40–150 × 3–15 mm, margins usually entire, sometimes shallowly dentate, faces hirsute or hirsuto-villous to sparsely strigose or glabrate, eglandular; cauline blades usually becoming lanceolate, abruptly or gradually reduced distally (bases sometimes subclasping). Heads 1–15. Involucres 5–9 × 10–20 mm. Phyllaries in (2–)3–4 series (greenish) , hirsute to strigose, eglandular. Ray florets 125–175; corollas white to pink or blue, 8–15 mm, laminae (nearly filiform) coiling tardily at tips. Disc corollas 4–5.5 mm. Cypselae 1.2–1.5 mm, 2-nerved, faces sparsely strigose; pappi: outer of setae, inner of 16–20 bristles.

Varieties 2 (2 in the flora): North America.

Erigeron glabellus is recognized by its subsimple caudices and fibrous-rooted bases, relatively numerous rays with nearly filiform laminae, and nonglandular vestiture.

1 Stems strigose (hairs closely appressed to ascending), sometimes sparsely so to glabrate   138a Erigeron glabellus var. glabellus
+ Stems hirsute to hirsuto-villous (hairs spreading)   138b Erigeron glabellus var. pubescens


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