giant ragweed
(Ambrosia trifida)
Conservation • Weed • Wetland • Description • Habitat • Ecology • Use • Distribution • Taxonomy
Conservation Status |
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| IUCN Red List | not listed |
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| NatureServe | N5? - Secure SNR - Unranked |
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| Minnesota | not listed |
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Weed Status |
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County Noxious Weed in Sibley and Waseca Counties. |
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Wetland Indicator Status |
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| Great Plains | FAC - Facultative |
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| Midwest | FAC - Facultative |
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| Northcentral & Northeast | FAC - Facultative |
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Description |
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Giant ragweed plant is easily distinguished from other ragweeds by its large size and palmately-lobed leaves. |
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Height |
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2′ to 9′ |
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Flower Color |
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Green |
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Similar Species |
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The leaves of other ragweeds are pinnatifid (western ragweed) or bipinnatifid (common ragweed). |
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Habitat |
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Moist soil. Disturbed sites, fields, roadsides. |
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Ecology |
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Flowering |
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August to September |
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Pests and Diseases |
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Use |
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Distribution |
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Sources |
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| 3/31/2023 | ||||
Nativity |
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Native |
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Occurrence |
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Common |
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Taxonomy |
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| Kingdom | Plantae (green algae and land plants) | ||
| Subkingdom | Viridiplantae (green plants) | ||
| Infrakingdom | Streptophyta (land plants and green algae) | ||
| Superdivision | Embryophyta (land plants) | ||
| Division | Tracheophyta (vascular plants) | ||
| Subdivision | Spermatophytina (seed plants) / Angiospermae (flowering plants) | ||
| Class | Magnoliopsida (flowering plants) | ||
| Superorder | Asteranae | ||
Order |
Asterales (sunflowers, bellflowers, fanflowers, and allies) | ||
Family |
Asteraceae (sunflowers, daisies, asters, and allies) | ||
| Subfamily | Asteroideae | ||
| Supertribe | Helianthodae | ||
| Tribe | Heliantheae (sunflowers and allies) | ||
| Subtribe | Ambrosiinae (cockleburs, ragweeds, and wild quinines) | ||
| Genus | Ambrosia (ragweeds) | ||
Subordinate Taxa |
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Synonyms |
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Ambrosia trifida var. integrifolia Ambrosia trifida var. trifida |
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Common Names |
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giant ragweed great ragweed |
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Glossary
Palmately Lobed
Similar to a hand. Having more than three lobes that radiate from a single point at the base of the leaf.
Pinnatifid
Deeply cut, more than half way to the midrib but not to the midrib, into lobes that are spaced out along the midrib; the lobes do not form separate leaflets.
Visitor Photos |
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MinnesotaSeasons.com Photos |
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Plant |
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Inflorescence |
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Flower Heads |
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Leaves |
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Early Spring |
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Slideshows |
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| Ambrosia trifida GIANT RAGWEED Frank Mayfield |
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Visitor Videos |
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Share your video of this plant. |
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Other Videos |
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| Giant Ragweed - University of Missouri MU Plant Sciences |
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About
Uploaded on Feb 28, 2012 Giant Ragweed, MU Weed Science, University of Missouri |
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| Greenhouse Giant Ragweed .m4v Ohio State University Weed Science |
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About
Uploaded on Feb 22, 2012 Dr. Mark Loux from The Ohio State University talks about herbicide resistant giant ragweed research being done in the university greenhouses. |
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| Weed of the Week #790 - Giant Ragweed (Air Date 5/26/13) AgPhD |
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About
Published on Jun 4, 2013 It's our Weed of the Week, Giant Ragweed. |
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