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Conyza canadensis (L.) Cronquist
CANADIAN FLEABANE
Erigeron canadensis L sensu Linnaeus, C 1753; Erigeron pusillus Nutt; Conyza parva Cronquist; Erigeron canadensis L; Canadian horseweed; Erigeron canadensis; Nipplewort

Life   Plantae   Dicotyledoneae   Asteraceae   Conyza

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Conyza canadensis
© Copyright Bobby Hattaway 2011 · 5
Conyza canadensis
Conyza canadensis
© Copyright Bobby Hattaway 2011 · 5
Conyza canadensis

Conyza canadensis
© Copyright Bobby Hattaway 2011 · 5
Conyza canadensis
Conyza canadensis, inflorescence - frontal view of flower
© Copyright Steve Baskauf, 2002-2011 · 4
Conyza canadensis, inflorescence - frontal view of flower

Conyza canadensis, inflorescence - lateral view of flower
© Copyright Steve Baskauf, 2002-2011 · 4
Conyza canadensis, inflorescence - lateral view of flower
Conyza canadensis, stem - showing leaf bases
© Copyright Steve Baskauf, 2002-2011 · 4
Conyza canadensis, stem - showing leaf bases

Conyza canadensis, leaf - on upper stem
© Copyright Steve Baskauf, 2002-2011 · 4
Conyza canadensis, leaf - on upper stem
Conyza canadensis, whole plant - in flower - general view
© Copyright Steve Baskauf, 2002-2011 · 4
Conyza canadensis, whole plant - in flower - general view

Conyza canadensis, inflorescence - whole - unspecified
© Copyright Steve Baskauf, 2002-2011 · 4
Conyza canadensis, inflorescence - whole - unspecified
Conyza canadensis
© Copyright Mel Harte 2010 · 3
Conyza canadensis

Conyza canadensis
© Copyright Mel Harte 2010 · 3
Conyza canadensis
Conyza canadensis
© Copyright Mel Harte 2010 · 3
Conyza canadensis

Conyza canadensis
© Copyright Mel Harte 2010 · 3
Conyza canadensis
Conyza canadensis
© Copyright Mel Harte 2010 · 3
Conyza canadensis

Associates · map
FamilyScientific name @ source (records)
Aphididae  Aphis ( @ NCSU_ENT (6); CSCA_TCN (8)

Brachycaudus ( @ AMNH_PBI (2)

Myzus ( @ AMNH_PBI (1)

Prociphilus ( @ NCSU (24)

Uroleucon ( @ NCSU (80); AMNH_PBI (8)
Braconidae  Aphidius ( @ AMNH_PBI (3)

Lysiphlebus ( @ AMNH_PBI (50)
Coccinellidae  Coccinella septempunctata @ I_LB (6)

Cycloneda munda @ I_LB (6)

Harmonia axyridis @ I_LB (19)

Hippodamia convergens @ I_LB (4)

Hippodamia variegata @ PN- (1)

Olla v-nigrum @ I_LB (2)
Delphacidae  Pareuidella triloba @ UDCC_TCN (1)

Pissonotus binotatus @ UDCC_NRI (9); NCSU (14)
Derbidae  Omolicna mcateei @ UDCC_TCN (1)
Diaspididae  Aonidiella aurantii @ CSCA_TCN (1)

Hemiberlesia lataniae @ CSCA_TCN (1)
Halictidae  Agapostemon sericeus @ UCMS_ENT (1)

Agapostemon texanus @ PN- (1)

Agapostemon virescens @ UCMS_ENT (1)

Augochlorella aurata @ UCMS_ENT (1)

Lasioglossum laevissimum @ AMNH_BEE (1)

Lasioglossum pilosum @ AMNH_BEE (2)
Lygaeidae  Nysius coenosulus @ BPBM_TCN (4)

Nysius palor @ BPBM_TCN (3)
Megachilidae  Heriades variolosa @ AMNH_BEE (1)
Membracidae  Campylenchia latipes @ UDCC_TCN (4); NCSU (1)

Entylia carinata @ UDCC_TCN (6); NCSU (2)

Micrutalis calva @ NCSU (9); UDCC_TCN (1)

Spissistilus festinus @ UDCC_TCN (1)
Miridae  Aoplonema princeps @ AMNH_PBI (1)

Deraeocoris nebulosus @ MEMU_ENT (1)

Keltonia sulphurea @ MEMU_ENT (1)

Lopidea ute @ AMNH_ENT (8)

Lygus lineolaris @ MEMU_ENT (99)

Polymerus basalis @ MEMU_ENT (5); AMNH_PBI (1)

Pseudatomoscelis seriatus @ MEMU_ENT (1)

Slaterocoris stygicus @ AMNH_PBI (2)

Spanagonicus albofasciatus @ MEMU_ENT (1)

Taylorilygus apicalis @ MEMU_ENT (85); AMNH_PBI (5)
Peronosporaceae  Basidiophora entospora @ BPI (1)
Pseudococcidae  Phenacoccus solenopsis @ CSCA_TCN (2)
Pucciniaceae  Puccinia cyperi @ BPI (4)
Reduviidae  Repipta taurus @ MEMU_ENT (1)
Rhopalidae  Harmostes reflexulus @ MEMU_ENT (1)
_  Anthomyiidae @ PN- (1)

Chrysididae @ PN- (1)

Crabronidae @ PN- (3)

Gryillidae @ PN- (1)

Hymenoptera @ PN- (1)

Miridae @ PN- (3)

Protaphis middletoni @ NCSU_ENT (13)

Ripiphoridae @ PN- (1)

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Delaware Wildflowers  •  Scientific names

Conyza canadensis (L.) Cronq. ( Conyza canadensis var. pusilla , Erigeron canadensis , Erigeron pusillus ) Canada Horseweed
Asteraceae — Aster family
Native
Conyza canadensis
The front yard
August 2001

More information on this plant, from other sources.


Copyright David G. Smith

Delaware Wildflowers main page

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FNA Vol. 20 Page 347 ,349, 350 Login | eFloras Home | Help
FNA | Family List | FNA Vol. 20 | Asteraceae | Conyza

4. Conyza canadensis (Linnaeus) Cronquist, Bull. Torrey Bot. Club. 70: 632. 1943.

Vergerette du Canada

Erigeron canadensis Linnaeus, Sp. Pl. 2: 863. 1753 (as canadense); Conyza canadensis var. glabrata (A. Gray) Cronquist; C. canadensis var. pusilla (Nuttall) Cronquist; C. parva Cronquist; E. canadensis var. pusillus (Nuttall) B. Boivin

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. 2 n = 18.

Flowering year round, mostly summer—fall. Disturbed places; 0—2000 m; Alta., B.C., Man., N.S., Ont., P.E.I., Que., Sask.; Ala., Ariz., Ark., Calif., Colo., Conn., Fla., Ga., Idaho, Ill., Ind., Iowa, Kans., Ky., La., Maine, Md., Mass., Mich., Minn., Miss., Mo., Mont., Nebr., Nev., N.H., N.J., N.Mex., N.Y., N.C., N.Dak., Ohio, Okla., Oreg., Pa., R.I., S.C., S.Dak., Tex., Utah, Vt., Va., Wash., W.Va., Wis., Wyo.; Mexico; Central America; introduced in South America, Europe, Asia, Africa.

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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Updated: 2017-11-19 04:05:55 gmt
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