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Ambrosia trifida L.
GIANT RAGWEED
Great ragweed

Life   Plantae   Dicotyledoneae   Asteraceae   Ambrosia

Ambrosia trifida, Giant Ragweed
© Copyright Sheryl Pollock 2011 · 5
Ambrosia trifida, Giant Ragweed

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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
© Copyright Bobby Hattaway 2011 · 5
Ambrosia trifida
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); BPI (5); 615278C (1); 615278A (1)
Diatrypaceae  Diatrypella herbacea @ BPI (1)
Entylomataceae  Entyloma compositarum @ 174932B (1); 174932A (1); BPI (44)

Entyloma polysporum @ 176272B (1); 176272A (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 @ AMNH_ENT (2); UDCC_TCN (2); NCSU (2); MEMU_ENT (1)

Campylenchia latipes @ UDCC_TCN (1)

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

Micrutalis calva @ MEMU_ENT (1)

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

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 @ 440193A (1); 440244B (1); 440244A (1); 440242A (1); BPI (19); 440193B (1); 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 @ BPI (25); 629076B (1); 629076A (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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Delaware Wildflowers  •  Scientific names

Ambrosia trifida L. Giant Ragweed
Asteraceae — Aster family
Native
Ambrosia trifida
Carousel Farm Park
August 2003

More information on this plant, from other sources.


Copyright David G. Smith

Delaware Wildflowers main page

Following modified from MissouriPlants.com
   Top | See original


Ambrosia trifida L. - Giant Ragweed

Family - Asteraceae

Stems - No info. yet.

Leaves - No info. yet.

Inflorescence - No info. yet.

Flowers - No info. yet.

Flowers close-up.

Flowering - July - September.

Habitat - Low woods, along streams, pond margins, waste ground, roadsides, railroads.

Origin - Native to U.S.

Other info. - A. trifida is found throughout Missouri and is the most abundant member of the genus in this state. It is very prolific and forms huge colonies when left undisturbed.
According to Steyermark there are 2 varieties of A. trifida in Missouri. Variety trifida f. integrifolia (Muhl.) Fern. has leaves which are unlobed, form trifida has typical 3-lobed leaves with a winged petiole. Variety texana Scheele has petioles with no wing.

Photographs taken at the Sunklands Conservation Area, Shannon County, MO., 8-1-04.



Following modified from Plants Database, United States Department of Agriculture
   Top | See original

http://plants.usda.gov/java/profile?symbol=AMTR ---> https://plants.usda.gov/java/profile?symbol=AMTR
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Following modified from Flora of North America
   Top | See original

Link to Flora of North America home
 
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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.

Following modified from CalPhotos
   Top | See original

http://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Ambrosia+trifida+var.+trifida+&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant ---> https://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Ambrosia+trifida+var.+trifida+&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant
&pull 20q v4.662 20091102: Error 501 Protocol scheme 'https' is not supported (LWP::Protocol::https not installed) https://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Ambrosia+trifida+var.+trifida+&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant

Following modified from CalPhotos
   Top | See original

http://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Ambrosia+trifida&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant ---> https://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Ambrosia+trifida&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant
&pull 20q v4.662 20091102: Error 501 Protocol scheme 'https' is not supported (LWP::Protocol::https not installed) https://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Ambrosia+trifida&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant

Updated: 2018-04-25 06:07:30 gmt
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