Compilation
Conyza canadensis

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Name

Identification
Erigeron canadensis L. [family ASTERACEAE ] (stored under name); Erigeron canadensis L. [family ASTERACEAE ] Verified by James L. Reveal, Conyza canadensis (L.) Cronquist [family ASTERACEAE ] Verified by James L. Reveal,
Related name
  • Erigeron foliosus
  • Conyza bilbaoana
  • Erigeron canadensis
  • Conyza canadensis
  • Erigeron strictus
  • Conyza myriocephala
  • Erigeron canadense
Common name
  • Vergerette du Canada, Flora of North America Vol. 20
  • nuguban (B&D) (IVORY COAST, MANDING-MANINKA), Burkill, H.M. 1985. The useful plants of west tropical Africa, Vol. 1
  • Canadian flea-bane., Burkill, H.M. 1985. The useful plants of west tropical Africa, Vol. 1
  • bliro (B&D) (IVORY COAST, KRU-GUERE (Chiehn)), Burkill, H.M. 1985. The useful plants of west tropical Africa, Vol. 1
  • santika (B&D) (IVORY COAST, ABURE), Burkill, H.M. 1985. The useful plants of west tropical Africa, Vol. 1
  • adika (B&D) (IVORY COAST, KYAMA), Burkill, H.M. 1985. The useful plants of west tropical Africa, Vol. 1

Flora

Entry for Conyza canadensis (Linnaeus) Cronquist [family COMPOSITAE]
Herbarium
Flora of North America (FNA)
Collection
Flora of North America
Resource Type
Reference Sources
Entry From
Flora of North America, Vol 20,
Names
Conyza canadensis (Linnaeus) Cronquist [family COMPOSITAE], Bull. Torrey Bot. Club, 70: 632. 1943
Erigeron canadensis Linnaeus [family COMPOSITAE], Sp. Pl., 2: 863. 1753 (as canadense)
Conyza canadensis var. glabrata (A. Gray) Cronquist [family COMPOSITAE]
Conyza canadensis var. pusilla (Nuttall) Cronquist [family COMPOSITAE]
Conyza parva Cronquist [family COMPOSITAE]
E. canadensis var. pusillus (Nuttall) B. Boivin [family ]
Treatment Author(s)
John L. Strother
Information
Plants erect, (3–)50–200(–350+) cm, branched mostly distally. Leaves: faces usually glabrate (proximal margins ± ciliolate, hairs usually stiff, spreading and hispid on nerves, hairs erect); proximal blades oblanceolate to linear, 20–50(–100+) × 4–10(–15+) mm, toothed to entire; distal similar, smaller, entire. Heads usually in paniculiform, sometimes corymbiform arrays. Involucres 3–4 mm. Phyllaries usually glabrous, sometimes sparsely strigose (margins chartaceous to scarious); outer greenish to stramineous, lanceolate to linear, shorter; inner stramineous to reddish, lance-attenuate to linear. Receptacles 1–1.5(–3) mm diam. in fruit. Pistillate florets 20–30(–45+); corollas ± equaling or surpassing styles, laminae 0.3–1 mm. Disc florets 8–30+. Cypselae uniformly pale tan to light gray-brown, 1–1.5 mm, faces sparsely strigillose; pappi of 15–25, white bristles 2–3 mm. 2n = 18.
Phenology
year round
Altitude range
0–2000 m;
Distribution
MexicoCentral Americaintroduced in South AmericaEuropeAsiaAfrica.USA Ala.USA Ariz.USA Ark.USA Calif.USA Colo.USA Conn.USA Fla.USA Ga.USA IdahoUSA Ill.USA Ind.USA IowaUSA Kans.USA Ky.USA La.USA MaineUSA Md.USA Mass.USA Mich.USA Minn.USA Miss.USA Mo.USA Mont.USA Nebr.USA Nev.USA N.H.USA N.J.USA N.Mex.USA N.Y.USA N.C.USA N.Dak.USA OhioUSA Okla.USA Oreg.USA Pa.USA R.I.USA S.C.USA S.Dak.USA Tex.USA UtahUSA Vt.USA Va.USA Wash.USA W.Va.USA Wis.USA Wyo.Canada Alta.Canada B.C.Canada Man.Canada N.S.Canada Ont.Canada P.E.I.Canada Que.Canada Sask.
Discussion
Conyza canadensis is thought to be native to North America and is now widely adventive, e.g., in South America, Europe, Asia, and Africa. Plants with stems glabrous and phyllaries red-tipped are sometimes treated as var. pusilla; similar plants with stems glabrous and phyllaries stramineous (not red-tipped) are sometimes treated as var. glabrata.

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