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Ambrosia artemisiifolia L.
RAGWEED
Ambrosia elatior L; Annual ragweed; Rgweed

Life   Plantae   Dicotyledoneae   Asteraceae   Ambrosia

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Ambrosia artemisiifolia
© Copyright Bobby Hattaway 2011 · 5
Ambrosia artemisiifolia
Ambrosia artemisiifolia
© Copyright Bobby Hattaway 2011 · 5
Ambrosia artemisiifolia

Ambrosia artemisiifolia
© Les Mehrhoff, 2008-2010 · 4
Ambrosia artemisiifolia
Ambrosia artemisiifolia
© Les Mehrhoff, 2008-2010 · 4
Ambrosia artemisiifolia

Ambrosia artemisiifolia, inflorescence - whole - unspecified
© Copyright Steve Baskauf, 2002-2011 · 4
Ambrosia artemisiifolia, inflorescence - whole - unspecified
Ambrosia artemisiifolia, inflorescence - whole - male
© Copyright Steve Baskauf, 2002-2011 · 4
Ambrosia artemisiifolia, inflorescence - whole - male

Ambrosia artemisiifolia, leaf - basal or on lower stem
© Copyright Steve Baskauf, 2002-2011 · 4
Ambrosia artemisiifolia, leaf - basal or on lower stem
Ambrosia artemisiifolia, stem - showing leaf bases
© Copyright Steve Baskauf, 2002-2011 · 4
Ambrosia artemisiifolia, stem - showing leaf bases

Ambrosia artemisiifolia, inflorescence - whole - female
© Copyright Steve Baskauf, 2002-2011 · 4
Ambrosia artemisiifolia, inflorescence - whole - female
Ambrosia artemisiifolia
© Copyright Malcolm Storey 2011-2118 · 3
Ambrosia artemisiifolia

Ambrosia artemisiifolia
© Copyright Malcolm Storey 2011-2118 · 3
Ambrosia artemisiifolia
Ambrosia artemisiifolia
© Copyright Malcolm Storey 2011-2118 · 3
Ambrosia artemisiifolia

Ambrosia artemisiifolia
© Copyright Malcolm Storey 2011-2118 · 3
Ambrosia artemisiifolia
Ambrosia artemisiifolia
© Copyright Malcolm Storey 2011-2118 · 3
Ambrosia artemisiifolia

Associates · map
FamilyScientific name @ source (records)
Albuginaceae  Albugo cubicus @ BPI (2)

Albugo tragopogonis @ 187869B (1); 186318A (1); BPI (49)
Aphididae  Aphis ( @ CSUC_TCN (3); NCSU_ENT (3)

Capitophorus @ CSCA_TCN (5)

Pleotrichophorus ambrosiae @ NCSU (4)

Pleotrichophorus wasatchii @ NCSU (3)

Uroleucon ( @ NCSU (95)
Braconidae  Aphidius ( @ AMNH_PBI (3)
Cicadellidae  Ceratagallia ( @ UCR_ENT (3)

Empoasca curvexa @ III (1)

Empoasca deckeri @ III (1)

Empoasca erigeron @ III (1)

Empoasca plebeia @ III (1)
Cicadidae  Tibicen chloromera @ MEMU_ENT (1)
Coccinellidae  Coccinella septempunctata @ I_LB (5)
Delphacidae  Stobaera azteca @ UDCC_TCN (1)

Stobaera concinna @ UDCC_TCN (8)
Dictyopharidae  Scolops pungens @ UDCC_TCN (1)
Dothioraceae  Metasphaeria ambrosiaecola @ BPI (2)
Endosphaeraceae  Rhodochytrium spilanthis @ BPI (11)

Rhodochytrium @ BPI (2)
Entomophthoraceae  Entomophthora @ BPI (1)
Entylomataceae  Entyloma compositarum @ BPI (29)

Entyloma polysporum @ BPI (28)

Entyloma @ BPI (1)
Erysiphaceae  Erysiphe ambrosiae @ 860157B (1); BPI (1)

Erysiphe cichoracearum @ BPI (69); 860157A (1)

Erysiphe lamprocarpa @ BPI (1)

Oidium ambrosiae @ BPI (1)
Flatidae  Cyarda @ UDCC_TCN (3)
Hyponectriaceae  Physalospora ambrosiae @ BPI (2)

Physalospora arthuriana @ BPI (1)
Membracidae  Acutalis tartarea @ UDCC_TCN (33); NCSU (92)

Campylenchia latipes @ UDCC_TCN (9); NCSU (4)

Entylia carinata @ UDCC_TCN (69); NCSU (142)

Micrutalis calva @ NCSU (1)

Publilia concava @ NCSU (10)
Miridae  Chlamydatus associatus @ AMNH_PBI (1)

Chlamydatus suavis @ AMNH_PBI (3)

Dimorphocoris atrans @ AMNH_PBI (1)

Gn_orthotylinigp5 sp_007 @ AMNH_PBI (1)

Hyaliodes vitripennis @ MEMU_ENT (2)

Keltonia sulphurea @ MEMU_ENT (9)

Lygus lineolaris @ MEMU_ENT (11)

Lygus @ AMNH_PBI (7)

Reuteroscopus ornatus @ AMNH_PBI (9)

Reuteroscopus unknown @ AMNH_PBI (12)

Slaterocoris ambrosiae @ AMNH_PBI (1)

Taylorilygus apicalis @ AMNH_PBI (3); MEMU_ENT (2)
Mycosphaerellaceae  Cercospora ferruginea @ BPI (1)

Septoria epambrosiae @ BPI (1)
Nectriaceae  Fusarium @ BPI (1)
Noctuidae  Diphthera festiva @ I_TQBH (1)
Peronosporaceae  Peronospora halstedii @ BPI (1)

Plasmopara halstedii @ 187869A (1); BPI (32)
Phaeosphaeriaceae  Ophiobolus anguillides @ BPI (10)

Ophiobolus fulgidus @ BPI (1)
Phyllachoraceae  Phyllachora ambrosiae @ BPI (19)
Protomycetaceae  Protomyces andinus @ BPI (4)
Psathyrellaceae  Ozonium omnivorum @ BPI (1)
Pseudococcidae  Chorizococcus shaferi @ MEMU_ENT (2)
Pucciniaceae  Puccinia canaliculata @ BPI (1)

Puccinia xanthii @ BPI (12)

Uromyces junci @ BPI (3)
Stictidaceae  Stictis radiata @ BPI (1)
Trichogrammatidae  Ufens @ UCRC_ENTA (1)
Tropiduchidae  Pelitropis rotulata @ UDCC_TCN (1)
Uropyxidaceae  Aecidium compositarum @ BPI (1)
Xylariaceae  Sphaeria acuminata @ BPI (1)
_  Gn_ms_granitohyoidea sp_wa0909msp119 @ AMNH_PBI (1)

Tiryus fuscosignatus @ AMNH_PBI (1)

Xenosporella berkeleyi @ BPI (1)

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FNA | Family List | FNA Vol. 21 | Asteraceae | Ambrosia

13. Ambrosia artemisiifolia Linnaeus, Sp. Pl. 2: 988. 1753.

Petite herbe à poux

Ambrosia artemisiifolia var. elatior (Linnaeus) Descourtilz; A. artemisiifolia var. paniculata (Michaux) Blankinship; A. elatior Linnaeus; A. glandulosa Scheele; A. monophylla (Walter) Rydberg

Annuals, 10—60(—150+) cm. Stems erect. Leaves opposite (proximal) and alternate; petioles 25—35(—60+) mm; blades deltate to lanceolate or elliptic, 25—55(—90+) × 20—30(—50+) mm, 1—2-pinnately lobed, bases cuneate, ultimate margins entire or toothed, abaxial faces sparsely pilosulous to strigillose, adaxial faces strigillose, both gland-dotted. Pistillate heads clustered, proximal to staminates; florets 1. Staminate heads: peduncles 0.5—1.5 mm; involucres shallowly cup-shaped (usually without black nerves), 2—3+ mm diam., glabrous or hispid to pilosulous; florets 12—20+. Burs: bodies ± globose to pyriform, 2—3 mm, ± pilosulous, spines or tubercles 3—5+, near middles or distal, ± conic to acerose, 0.1—0.5+ mm, tips straight. 2 n = 34, 36.

Flowering Jul—Oct. Wet to dry soils, disturbed sites; 0—1000+ m; Alta., B.C., Man., N.B., Nfld. and Labr. (Nfld.), N.W.T., N.S., Ont., P.E.I., Que., Sask.; Ala., Alaska, Ariz., Ark., Calif., Colo., Conn., Del., D.C., 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., Tenn., Tex., Utah, Vt., Va., Wash., W.Va., Wis., Wyo.

Hybrids between Ambrosia artemisiifolia and A. psilostachya have been called A. × intergradiens W. H. Wagner. The name Ambrosia × helenae Rouleau applies to hybrids between A. artemisiifolia and A. trifida .

Updated: 2021-06-20 21:20:46 gmt
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