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Ambrosia trifida L.
GIANT RAGWEED
Great ragweed

Life   Plantae   Dicotyledoneae   Asteraceae   Ambrosia

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

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

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

Ambrosia trifida, Giant Ragweed
© Copyright Sheryl Pollock 2011 · 5
Ambrosia trifida, Giant Ragweed
Ambrosia trifida, whole plant - in flower - general view
© Copyright Steve Baskauf, 2002-2011 · 4
Ambrosia trifida, whole plant - in flower - general view

Ambrosia trifida, inflorescence - whole - unspecified
© Copyright Steve Baskauf, 2002-2011 · 4
Ambrosia trifida, inflorescence - whole - unspecified
Ambrosia trifida, inflorescence - lateral view of flower
© Copyright Steve Baskauf, 2002-2011 · 4
Ambrosia trifida, inflorescence - lateral view of flower

Ambrosia trifida, leaf - on upper stem
© Copyright Steve Baskauf, 2002-2011 · 4
Ambrosia trifida, leaf - on upper stem
Ambrosia trifida, stem - showing leaf bases
© Copyright Steve Baskauf, 2002-2011 · 4
Ambrosia trifida, stem - showing leaf bases

Ambrosia trifida, whole plant - in flower - general view
© Copyright Steve Baskauf, 2002-2011 · 4
Ambrosia trifida, whole plant - in flower - general view
Ambrosia trifida, whole plant - in flower - general view
© Copyright Steve Baskauf, 2002-2011 · 4
Ambrosia trifida, whole plant - in flower - general view

Associates · map
FamilyScientific name @ source (records)
Albuginaceae  Albugo tragopogonis @ BPI (5)
Anthocoridae  Orius insidiosus @ MEMU_ENT (1)
Aphididae  Aphis ( @ CSUC_TCN (6)

Prociphilus ( @ NCSU (5)

Rhopalosiphum maidis @ AMNH_PBI (3)

Uroleucon ( @ NCSU (52)
Botryosphaeriaceae  Diplodia @ BPI (1)

Phyllosticta ambrosiae @ BPI (2)
Cicadellidae  Agallia @ MEMU_ENT (1)

Draeculacephala balli @ MEMU_ENT (1)

Empoasca ( @ MEMU_ENT (3)

Graminella nigrifrons @ MEMU_ENT (1)

Graphocephala versuta @ MEMU_ENT (2)

Stirellus bicolor @ MEMU_ENT (1)
Coccinellidae  Coccinella septempunctata @ I_LB (3)

Harmonia axyridis @ I_LB (3)
Dermateaceae  Mollisia atrata @ BPI (5)

Mollisia atrocinerea @ BPI (1)

Phlyctema arcuata @ BPI (5)

Pyrenopeziza atrata @ BPI (2)
Diaporthaceae  Diaporthe arctii @ 615278B (1); 615278C (1); BPI (5); 615278A (1)
Diatrypaceae  Diatrypella herbacea @ BPI (1)
Entylomataceae  Entyloma compositarum @ 174932A (1); BPI (44); 174932B (1)

Entyloma polysporum @ 176272A (1); 176272B (1); BPI (23)
Erysiphaceae  Erysiphe cichoracearum @ BPI (120)

Erysiphe lamprocarpa @ BPI (1)
Flatidae  Metcalfa pruinosa @ AMNH_IZC (1)
Fulgoridae  Poblicia fuliginosa @ UDCC_TCN (1)
Glomerellaceae  Colletotrichum @ BPI (1)
Hyponectriaceae  Physalospora ambrosiae @ BPI (6)
Lophiostomataceae  Lophionema vermisporum @ BPI (1)
Membracidae  Acutalis tartarea @ UDCC_TCN (2); MEMU_ENT (1); NCSU (2); AMNH_ENT (2)

Campylenchia latipes @ UDCC_TCN (1)

Entylia carinata @ UDCC_TCN (15); NCSU (6)

Micrutalis calva @ MEMU_ENT (1)

Publilia concava @ UDCC_TCN (3); NCSU (2)

Publilia modesta @ AMNH_ENT (2)

Stictocephala taurina @ UDCC_TCN (3)
Miridae  Hyaliodes vitripennis @ MEMU_ENT (2)

Ilnacora malina @ AMNH_PBI (4)

Ilnacora stalii @ MEMU_ENT (4)

Lygus lineolaris @ MEMU_ENT (25)

Lygus plagiatus @ MEMU_ENT (9)

Polymerus basalis @ MEMU_ENT (3)

Sixeonotus albicornis @ MEMU_ENT (1)

Slaterocoris breviatus @ MEMU_ENT (2)

Slaterocoris stygicus @ AMNH_PBI (14); MEMU_ENT (4)

Taylorilygus apicalis @ MEMU_ENT (9)
Mycosphaerellaceae  Cercospora arctii-ambrosiae @ BPI (3)

Cercospora ferruginea @ BPI (9)

Cercospora racemosa @ 440193B (1); 440244A (1); 440193A (1); 440244B (1); 440242A (1); BPI (19); 440242B (1)

Cercospora trifidae @ BPI (3)

Mycosphaerella nebulosa @ BPI (1)

Rhabdospora @ BPI (1)

Septoria bacilligera @ BPI (11)
Nidulariaceae  Crucibulum vulgare @ BPI (1)
Pentatomidae  Euschistus @ MEMU_ENT (1)
Peronosporaceae  Peronospora halstedii @ BPI (1)

Plasmopara halstedii @ 188150D (1); BPI (39)
Pezizaceae  Peziza atrata @ BPI (1)
Phaeosphaeriaceae  Leptosphaeria consessa @ BPI (2)

Leptosphaeria dumetorum @ BPI (1)

Leptosphaeria subacuta @ BPI (2)

Ophiobolus acuminatus @ BPI (1)

Ophiobolus anguillides @ BPI (4)

Ophiobolus clavisporus @ BPI (1)

Ophiobolus fulgidus @ 629076A (1); BPI (25); 629076B (1)

Ophiobolus @ BPI (9)

Stagonospora trifidae @ BPI (1)
Phyllachoraceae  Phyllachora ambrosiae @ BPI (4)
Pleomassariaceae  Helminthosporium interseminatum @ BPI (1)
Pleosporaceae  Alternaria cheiranthi @ BPI (1)
Protomycetaceae  Protomyces andinus @ BPI (3)

Protomyces gravidus @ BPI (4)

Protomyces polysporus @ BPI (2)
Psathyrellaceae  Ozonium omnivorum @ BPI (1)
Pucciniaceae  Puccinia canaliculata @ BPI (7)

Puccinia xanthii @ BPI (96)

Uromyces junci @ BPI (1)
Trichiaceae  Perichaena vermicularis @ BPI (1)
Tricholomataceae  Helotium scutula @ BPI (1)
Turritellidae  Vermicularia dematium @ BPI (2)
_  Cicinobolus cesatii @ BPI (3)

Hormiscium ambrosiae @ BPI (3)

Illosporium @ BPI (1)

Ormathodium ambrosiae @ BPI (1)

Stachybotrys atra @ BPI (2)

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Following modified from Delaware Wildflowers
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http://delawarewildflowers.org/plant.php?id=0079 ---> https://delawarewildflowers.org/plant.php?id=0079

Delaware Wildflowers  •  Scientific names

Ambrosia trifida L. Giant Ragweed
Asteraceae — Aster family
Native
Ambrosia trifida Ambrosia trifida
Carousel Farm Park
August 2003 Ambrosia trifida
White Clay Creek State Park -- Possum Hill
June 2021 Ambrosia trifida Ambrosia trifida
Staminate flowers above pistillate flowers. White Clay Creek State Park -- Possum Hill
September 2020

Search Google Delaware USDA

Photos copyright David G. Smith

Information from the Delaware Flora Checklist used with author's permission.

Delaware Wildflowers main page

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Following modified from Flora of North America
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FNA Vol. 21 Page 11, 13 , 14 , 15 Login | eFloras Home | Help
FNA | Family List | FNA Vol. 21 | Asteraceae | Ambrosia

10. Ambrosia trifida Linnaeus, Sp. Pl. 2: 987. 1753.

Giant ragweed, grande herbe à poux

Ambrosia aptera de Candolle; A. trifida var. integrifolia (Muhlenberg ex Willdenow) Torrey & A. Gray; A. trifida var. texana Scheele

Annuals, 30—150(—400+) cm. Stems erect. Leaves mostly opposite; petioles 10—30(—70+) mm; blades rounded-deltate to ovate or elliptic, 40—150(—250+) × 30—70(—200+) mm, usually some blades palmately 3(—5)-lobed, bases truncate to cuneate (sometimes decurrent onto petioles), margins usually toothed, rarely entire, abaxial and adaxial faces ± scabrellous and gland-dotted. Pistillate heads clustered, proximal to staminates; florets 1. Staminate heads: peduncles 1—3+ mm; involucres ± saucer-shaped, 2—4 mm diam., scabrellous (often with 1—3 black nerves); florets 3—25+. Burs: bodies ± pyramidal, 3—5(—7+) mm, glabrous or glabrate, spines 4—5, ± distal, ± acerose, 0.5—1 mm, tips straight (bases ± decurrent as ribs). 2 n = 24, 48.

Flowering Jul—Nov. Disturbed sites, waste places, damp soils; 0—1600 m; Alta., B.C., Man., N.B., 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., 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.; Mexico (Chihuahua).

The name Ambrosia × helenae Rouleau applies to hybrids between A. artemisiifolia and A. trifida . Hybrids between A. bidentata and A. trifida have been recorded. Ambrosia trifida may be no longer extant in British Columbia.

Updated: 2024-06-13 06:16:08 gmt
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