Conyza bonariensis |
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Argentine fleabane, asthmaweed, flax-leaf fleabane, flax-leaf horseweed, hairy horseweed, South American conyza, wavy-leaf fleabane |
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Habit | Plants erect, 10–100(–150+) cm, branched mostly distally. |
Leaves | faces ± densely strigose or hispidulous; proximal blades oblanceolate, 30–80(–120+) × 10–25+ mm, obscurely lobed to coarsely toothed or entire; distal narrowly oblanceolate to linear, 10–50 × 2–10 mm, obscurely toothed or entire. |
Involucres | 3.5–5 mm. |
Receptacles | 3–5 mm diam. in fruit. |
Pistillate florets | 60–150+; corollas ± equaling or surpassing styles, laminae 0 or to 0.3 mm. |
Disc florets | 8–12+. |
Phyllaries | usually strigose or hispidulous; outer greenish to purplish, lanceolate, shorter; inner stramineous to purplish, linear-attenuate (more chartaceous to scarious, less hairy). |
Heads | usually in paniculiform to racemiform, rarely corymbiform arrays. |
Cypselae | pale tan, 1–1.5 mm, faces glabrous or sparsely strigillose; pappi of 15–25+, pinkish, sordid, or tawny bristles 3–4+ mm. |
2n | = 54. |
Conyza bonariensis |
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Phenology | Flowering year round, mostly late summer–fall. |
Habitat | Disturbed sites, along roads and streets |
Elevation | 0–500 m (0–1600 ft) |
Distribution |
AL; AZ; CA; FL; GA; LA; MS; NC; NM; OR; SC; TX; UT; VA; South America [Introduced in North America]
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Discussion | Conyza bonariensis is widespread in tropical and warm-temperate regions of the world. It is thought to be native to South America. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 349. |
Parent taxa | Asteraceae > tribe Astereae > Conyza |
Sibling taxa | |
Synonyms | Erigeron bonariensis |
Name authority | (Linnaeus) Cronquist: Bull. Torrey Bot. Club 70: 632. (1943) |
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