Vascular Plant Families - Trees & Shrubs - Gymnosperms - Wildflowers - Graminoids
Pteridophytes - Bryophytes - Lichens

Cultivated Plants - Rare Plants - Weeds & Invasive Species - Poisonous Plants - Ethnobotany - First Nations

North America - Canada - U.S.A. - Other Countries

Taxonomic Databases - Miscellany - Glossaries & Dictionaries

Choose one of the links above for a list of plant-related websites about that category. Selected websites include only non-commercial, free-access sites that do not require passwords. The links provided have all been checked as of April 18, 2008, but visitors should note that most large websites have a regular downtime for editing and uploading more information. Often, this downtime occurs on the weekends, especially Sunday night (students take note!). If you find a link that doesn't work, try that site again at a different time or on a different day; if it still does not work, please report the problematic link to the NOPD.

Weeds & Invasive Species

Aquatic and Wetland Plants and Invasive Plants - Photo Gallery
http://aquat1.ifas.ufl.edu/photos.html
The University of Florida's Centre for Aquatic and Invasive Species has webpages, including many excellent images and line drawings, to aquatics and invasive plants in Florida, many of which are also found in our area.

Aquatic Non-Native and Invasive Species
http://www.on.ec.gc.ca/coa/2001/invaders-e.html
A webpage from Environment Canada that discusses alien species in our Great Lakes.

Botanical Bullies
http://www.nwcb.wa.gov/education/publications/botbullies&aq.pdf
A nicely illustrated 2-page .pdf file on garden invasives from the Washington State Noxious Weed Control Board, intended to remind gardeners not to dispose of unwanted garden plants in a manner that will allow them to invade our natural habitats.

Federal Noxious Weed Disseminules of the U.S.
http://www.lucidcentral.org/keys/FNW/FNW%20Disseminules%20Key/html/index.htm
A useful website by Julia Schur, APHIS (USDA), with descriptive pages and images of seeds of species classified as noxious weeds in the U.S. Access the species through this list of Fact Sheets.

Identifying Invasive Plants of Middle Tennessee
http://www.cas.vanderbilt.edu/bioimages/pages/invasive-plants.htm
A webpage on a few species considered to be invasive in middle Tennessee, and some of which also occur in northern Ontario. This webpage is part of Bioimages, a website hosted by Vanderbilt Univ.

Invasive Alien Species
http://www.inspection.gc.ca/english/plaveg/invenv/invenve.shtml
A website from the Canada Food Inspection Agency (CFIA) that provided information on regulations regarding alien species, as well as webpages on plant pests and other invasive species in Canada.

Invasive and Exotic Species
http://www.invasive.org/
A source for information and images of invasive & exotic species. A joint project of The University of Georgia's Bugwood Network, USDA Forest Service and USDA APHIS PPQ. Includes a list of invasive plant species in the U.S.

Invasive Aquatic and Wetland Plants of Manitoba
http://www.invasivespeciesmanitoba.com/
A website on Invasive species in Manitoba, but also relevant to Ontario. Link to the list of webpages on Manitoba's invasive plant species.

Invasive Plant Alert
http://www.agf.gov.bc.ca/cropprot/invasiveplant.htm
This website from the Ministry of Agriculture and Lands, Govt. of British Columbia, includes links to webpages of many invasive species in Canada.

Invasive Plant Info-Sheets - Alberta Invasive Plants Council
http://www.invasiveplants.ab.ca/management.htm
A collection of excellent webpages (in pdf format) that provides information on identification, prevention, and control of many of Canada's invasive species.

Invasive Plants of Canada
http://www.rbg.ca/cbcn/en/projects/invasives/invade1.html
The Canadian Botanical Conservation Network (CBCN) has compiled this website on invasive species in Canada. Educational information and newsletters are among the links included in this website. Lists of invasive herbs, trees, and shrubs, with brief descriptions, can be accessed from the Invasive Plant Lists link.

Invasive Plants of Northeastern Wisconsin
http://www.uwgb.edu/biodiversity/herbarium/invasive_species/invasive_plants01.htm
Another great collection of webpages from Gary Fewless, Cofrin Center for Biodiversity, University of Wisconsin-Green Bay. Text includes descriptions and information on the history of the introduction of these species into Wisconsin. Digital image feature habitats and diagnostic traits.

National Invasive Species Information Centre - Plants
http://www.invasivespeciesinfo.gov/plants/main.shtml
An informative website from the U.S. Department of Agriculture that features profiles on many plant species that are, or have the potential to become, invasive in Canada.

Ontario Weeds - Weed Gallery
http://www.omafra.gov.on.ca/english/crops/facts/ontweeds/weedgal.htm
A website from the Ontario Ministry of Agriculture, Foods and Rural Affairs that provides links to informative webpages of Ontario's weedy plant species. See also these links to galleries of Noxious Weeds in Ontario, thumbnails of OntarioWeeds, and Milkweed Species in Ontario.

Prohibited Noxious Weed Seeds
http://www.em.ca/garden/ca_noxwe.html
A list of species banned by Canada's Dept. of Agriculture (Canadian Food Inspection Agency) from import into the country. Some species on the list have links to excellent images.

UC-IPM Online - Weed Photo Gallery
http://www.ipm.ucdavis.edu/PMG/weeds_scientific.html
An image gallery from the Statewide Integrated Pest Management Program, Agriculture and Natural Resources Dept., University of California-Davis. Select a plant by common name, scientific name, or family name.

Washington State Noxious Weed Control Board
http://www.nwcb.wa.gov/
The noxious weed species lists in this website from Washington State link to excellent descriptive pages with images of many weed species also found in Canada.

Weed Identification Guide - Field Weeds
http://oregonstate.edu/dept/nursery-weeds/weedspeciespage/field_weed_species_2.html
A website by James Altland, from Oregon State University, on weedy species from crop fields. Each page includes a variety of images, such as habit, foliage, flower, and stems.

Weeds in Ontario
http://www.omafra.gov.on.ca/english/crops/insects/weeds.html
Another website from the Ontario Ministry of Agriculture, Food and Rural Affairs that provides a variety of informative Factsheets, Infosheets, and Publications on various weed species and related topics.

Weedy Wildflowers of Illinois
http://www.illinoiswildflowers.info/weeds/weed_index.htm
The best illustrated and descriptive information on weeds in North America, by John Hilty; part of his Wildflowers of Illinois series.