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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

Following modified from MissouriPlants.com
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Following modified from Flora of North America
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