Hypericum perforatum L.
common St. Johnswort
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Click on the image below to enlarge it and download a high-resolution
JPEG file.
Jennifer Anderson. United States, IA, Scott Co., Princeton, Princeton Marsh. 2002. Usage Requirements.
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Images:
Hypericum perforatum L.
Click on a thumbnail to view an image, or
see all the Hypericum thumbnails at the PLANTS Gallery
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Distribution:
Hypericum perforatum L.
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See U.S. county distributions (when available) by clicking on the map or the linked states below:
USA (AR, CA, CO, CT, DC, DE, GA, HI, IA, ID, IL, IN, KS, KY, LA, MA, MD, ME, MI, MN, MO, MS, MT, NC, ND, NE, NH, NJ, NM, NV, NY, OH, OK, OR, PA, RI, SC, SD, TN, TX, VA, VT, WA, WI, WV, WY), CAN (BC, MB, NB, NF, NS, ON, PE, QC), FRA (SPM) |
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Related Taxa:
Hypericum perforatum L.
View
8 genera in Clusiaceae,
76 species in Hypericum
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Classification:
Hypericum perforatum L.
Click on a scientific name below to expand it in the PLANTS
Classification Report.
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Noxious Weed Information:
Hypericum perforatum L.
This plant is listed by the U.S. federal government or a state. Common names are from state and federal lists. Click on a place
name to get a complete noxious weed list for that location,
or click here for a composite list of all
Federal and State Noxious Weeds.
| California: |
| klamathweed |
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C list (noxious weeds) |
| Colorado: |
| common St. Johnswort |
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C list (noxious weeds) |
| Montana: |
| St. Johnswort |
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Category 1 noxious weed |
| Nevada: |
| Klamath weed |
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Noxious weed |
| Oregon: |
| St.Johnswort, Klamath weed |
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"B" designated weed |
| South Dakota: |
| St. Johnswort |
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Regulated non-native plant species |
| Washington: |
| common St. Johnswort |
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Class C noxious weed |
| Wyoming: |
| common St. Johnswort |
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Noxious weed |
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U.S. Weed Information:
Hypericum perforatum L.
Klamathweed
St. John's wort
common St. John's wort
This plant can be weedy or invasive according to the authoritative sources noted below. This plant
may be known by one or more common names in different
places, and some are listed above. Click on an acronym
to view each weed list, or click here for a
composite list of Weeds of the U.S.
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Assorted authors.
200_.
State noxious weed lists for 46 states.
State agriculture or natural resource departments.
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| Cal-IPC |
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California Invasive Plant Council.
2006.
California Invasive Plant Inventory. Cal-IPC Publication 2006-02 (February 2007).
California Invasive Plant Council.
Berkeley, California.
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| NE&GP |
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Stubbendieck, J., G.Y. Friisoe, & M.R. Bolick.
1994.
Weeds of Nebraska and the Great Plains.
Nebraska Department of Agriculture, Bureau of Plant Industry.
Lincoln, Nebraska.
589pp.
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| SEEPPC |
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Southeast Exotic Pest Plant Council.
1996.
Invasive exotic pest plants in Tennessee (19 October 1999).
Research Committee of the Tennessee Exotic Pest Plant Council.
Tennessee.
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| SWSS |
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Southern Weed Science Society.
1998.
Weeds of the United States and Canada. CD-ROM.
Southern Weed Science Society.
Champaign, Illinois.
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| WI |
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Hoffman, R. & K. Kearns (eds.).
1997.
Wisconsin manual of control recommendations for ecologically invasive plants.
Wisconsin Dept. Natural Resources.
Madison, Wisconsin.
102pp.
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| WSWS |
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Whitson, T.D. (ed.) et al.
1996.
Weeds of the West.
Western Society of Weed Science in cooperation with Cooperative Extension Services, University of Wyoming.
Laramie, Wyoming.
630pp.
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Introduced Information:
Hypericum perforatum L.
This plant is introduced to some part of the PLANTS
Floristic Area, though it may be native in other parts. Click on
link below for a partial or complete list of PFA introduced plants.
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More Accounts and Images:
Hypericum perforatum L.
View photographs from CalPhotos.
View species account from ARS Germplasm Resources Information Network (GRIN).
View taxonomic account from Integrated Taxonomic Information System (ITIS) for ITIS Taxonomic Serial Number 21454.
View species account and distribution map from Jepson Interchange (University of California - Berkeley).
View species account from Native American Ethnobotany (University of Michigan - Dearborn).
View photographs and distribution from University of Tennessee Herbarium.
View photographs and distribution from University of Washington Burke Museum.
View species account and photographs from University of Wisconsin - Stevens Point Freckmann Herbarium.
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Related Web Sites:
Hypericum perforatum L.
British Columbia Ag. & Food, Crop Protection Program
Herbal Information Resources
MT-Center for Invasive Plant Management
NV-Extension Weed Wanted Posters
NY-Cornell University: Poisonous Plant Databases (images)
Poisonous Plants of the Southern United States
Victoria - Natural Resources & Environment: Landcare Notes
WA-King County Noxious Weeds
WA-Noxious Weed List & Information
Wildflowers of Western Kentucky
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