Plants (10–) 70–150 cm. Stems usually simple, often with short, leafy branches proximally. Heads 20–100, in open, diffuse arrays, primary branches longer than peduncles. Involucres 5–6.2 mm. Phyllaries 30–42, subulate to lanceolate, narrow, green zones narrowly lanceolate. Ray-florets (23–) 27–37 (–42) in (1–) 2 series; laminae usually white, sometimes pink, 1.9–3 × 0.2–0.5 mm, longer than pappi, drying in 1–2 coils (apices shallowly to deeply lobed). Disc-florets (6–) 8–15; corollas 3.4–4.4 (–4.7) mm. Cypselae 1.5–2.7 mm; pappi 3.5–3.8 (–4.2) mm. 2n = 10.

Phenology: Flowering Jul–Nov(–Jan).
Habitat: Roadsides, marshy habitats, often weedy
Elevation: 0–1100(–4000) m

Distribution

• Generated Map
• Legacy Map

Ala., Ariz., Calif., Fla., Nev., N.Mex., Okla., Tex., Utah, Mexico, West Indies, Central America, n South America, in Asia (Japan), Pacific Islands (Hawaii)

Discussion

Selected References

None.

Lower Taxa

None.

"thin" is not a number.