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. Heads usually in paniculiform to racemiform, rarely corymbiform arrays. Involucres 3.5-5 mm. Phyllaries usually strigose or hispidulous; outer greenish to purplish, lanceolate, shorter; inner stramineous to purplish, linear-attenuate (more chartaceous to scarious, less hairy). 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+. 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. Flowering year round, mostly late summer-fall. Disturbed sites, along roads and streets; 0-500 m; introduced; Ala., Ariz., Calif., Fla., Ga., La., Miss., N.Mex. N.C., Oreg., S.C., Tex., Utah, Va.; South America. Conyza bonariensis is widespread in tropical and warm-temperate regions of the world. It is thought to be native to South America.

Plant: Annual 20-120 cm, ± gray-hairy; stems 1-several from base, strigose and long-soft-hairy, leafy Leaves: 1-9 cm, alternate, linear to ± (ob)lanceolate, entire to shallowly lobed, obtuse to acute INFLORESCENCE: primary inflorescence a head, each resembling a flower; generally many in raceme- or panicle-like clusters; lateral clusters often overtopping central; peduncles generally 1-4 cm; fresh involucres 5-7 mm diam; phyllaries 2-6 mm, often purple-tipped, densely soft-hairy, whitish or dull brown inside when dry and reflexed, midvein green to purple, not resin-filled Flowers: Pistillate flowers very many; corollas 3-4 mm, corollas white, pink, or cream, narrowly cylindric; ligule ± 0; Disk flowers 10-20; corollas 3.5-4 mm, greenish yellow; lobes short-triangular; style tips lanceolate, included or short-exserted Fruit: achenes, ± 1.5 mm, elliptic, compressed, puberulent; pappus 3-4 mm, generally ± reddish in age, of bristles Misc: Disturbed, generally urban sites; generally < 1000 m. Notes: Pappus sordid and somewhat tawny.There are 2-3 rows of ray flowers. References: Kearney & Peebles; Arizona Flora. Hickman, ed.; The Jepson Manual. A Utah Flora. ASU specimans