| tansy ragwort |
USDA PLANTS Symbol: SEJA USDA ARS GRIN: 104534 ITIS: 36089 NAPIS: PBFCXBC |
| Senecio jacobaea L. | |
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Taxonomic Rank: Magnoliopsida: Asterales: Asteraceae |
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| Synonym(s): ragwort, stinking Willie | |
Tansy ragwort is a biennial to short-lived perennial herb native to Eurasia. Plants can reach 1-4 ft. (0.3-1.2 m) tall. Cauline (stem) leaves are sessile and deeply lobed. Flowering occurs in summer to early fall, when yellow, daisy-like flowers develop in a flat topped inflorescence at the apex of the stems. Flower heads are 0.8 in. (2 cm) in diameter. Fruit are small and have a persistent ring of white hairs (pappus) attached. Tansy ragwort is native to Europe and was possibly introduced into the United States as a medicinal plant. Plants invade pastures, open forests, swamps, riverbeds and disturbed areas. |
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Identification, Biology, Control and Management Resources
- Weed of the Week - USDA Forest Service
- Element Stewardship Abstract - The Nature Conservancy
- Invasive Plant Atlas of New England - University of Connecticut
| Selected Images from Invasive.org | View All Images at Invasive.org |
 Seedling(s); Utah State University Archive, Utah State University, Bugwood.org Additional Resolutions & Image Usage |
 Foliage; Richard Old, XID Services, Inc., Bugwood.org Additional Resolutions & Image Usage |
 Plant(s); in flower Richard Old, XID Services, Inc., Bugwood.org Additional Resolutions & Image Usage |
 Flower(s); Michael Shephard, USDA Forest Service, Bugwood.org Additional Resolutions & Image Usage |
 Flower(s); Richard Old, XID Services, Inc., Bugwood.org Additional Resolutions & Image Usage |
 Fruit(s); Leslie J. Mehrhoff, University of Connecticut, Bugwood.org Additional Resolutions & Image Usage |
 Plant(s); in flower Eric Coombs, Oregon Department of Agriculture, Bugwood.org Additional Resolutions & Image Usage |
 Plant(s); Eric Coombs, Oregon Department of Agriculture, Bugwood.org Additional Resolutions & Image Usage |
 Plant(s); in flower Tom Heutte, USDA Forest Service, Bugwood.org Additional Resolutions & Image Usage |
 Plant(s); in flower Faith Duncan, USDA Forest Service, Bugwood.org Additional Resolutions & Image Usage |
 Infestation; Eric Coombs, Oregon Department of Agriculture, Bugwood.org Additional Resolutions & Image Usage |
 Diagram or Graphic; Britton, N.L., and A. Brown. 1913. Illustrated flora of the northern states and Canada. Vol. 3: 542. USDA PLANTS Database, USDA NRCS PLANTS Database, Bugwood.org Additional Resolutions & Image Usage |
Taxonomic References:
- USDA, NRCS. 2001. The PLANTS Database, Version 3.1, National Plant Data Center, Baton Rouge, LA 70874-4490 USA.
Invasive Listing Sources:
- Faith Campbell, 1998. Plants that Hog the Garden: Invasive Plants in the United States. Fine Gardening Online
- Jil M. Swearingen, Survey of invasive plants occurring on National Park Service lands, 2000-2007
- John Randall, The Nature Conservancy, Survey of TNC Preserves, 1995.
- Pacific Northwest Exotic Pest Plant Council, 1998
- WeedUS - Database of Plants Invading Natural Areas in the United States
- Arizona Noxious Weeds
- California Invasive Plant Council
- California Noxious Weeds
- Colorado Noxious Weeds
- Connecticut Noxious Weeds
- Idaho Noxious Weeds
- Massachusetts Noxious Weeds
- Montana Noxious Weeds
- Oregon Noxious Weeds
- Washington Noxious Weeds
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