Erigeron annuus (L.) Pers.
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Authority
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
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Family
Asteraceae
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Scientific Name
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Description
Species Description - Annual or rarely biennial, 6–15 dm, amply leafy; stem hirsute, the hairs spreading except near the top; basal lf-blades elliptic to suborbicular, coarsely toothed, to 10 × 7 cm, ± abruptly long-petiolate; cauline lvs numerous, broadly lanceolate or broader, all except sometimes the uppermost usually sharply toothed; heads several to very numerous; invol 3–5 mm, finely glandular and sparsely beset with long, flattened, transparent hairs; disk 6–10 mm wide; rays 80–125, white or rarely anthocyanic, 4–10 × 0.5–1.0 mm; disk-cors 2.0–2.8 mm; achenes 2-nerved; pappus of the disk-fls double, with 10–15 bristles and several very short, slender scales (visible at 20x), that of the rays-fls of short scales only; 2n=27, 54. A weed in disturbed sites over most of the U.S. and adj. Can., more common northward.
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Common Names
annual fleabane