Weed Ecology at UW Madison Also check out their Weedometer

National Be Nice to Nettles Week Almost everyone is familiar with the nettle having experienced its formidable sting. To many it is a troublesome weed that should be eradicated wherever it is found. This point of view has only recently developed. Indeed the humble nettle has played, and continues to play, an important role in the natural world...

Weeds of the North Cental States

Australian Weeds in Australia

Virginia Tech's Weed Identification Guide These pages are intended to aide in the identification of common weeds and weed seedlings found throughout Virginia and the Southeastern U.S. The weed pictures in this guide are arranged alphabetically by common name and may be viewed by clicking on one of the letters to the left.

Weeds of the North Central States All the weeds commonly found in the North Central Region, as well as a good many that are less common

Miscanthus Invasions Several areas of southeastern Pennsylvania are dominated by Miscanthus species -- an attractive but invasive grass. A University of Minnesota site identifies the invasive species and offers guidelines for management and ornamental use.

New Jersey Agricultural Weed Gallery, a collection of photos and descriptions of agricultural weeds found in New Jersey.

Thistle an online journal of research into the taxonomy and ecology of the thistle tribe.

Mistletoe
University of California Mistletoe

Botanical.com Mistletoe description, history, medicinal uses, and more

Misunderstood mistletoe - friend or foe? The name mistletoe conjures up images of leaves pinned up over doorways to give people an excuse for a quick kiss, or the traditions of Christmas. Now some Australian scientists suggest mistletoes are killing our trees and should be destroyed.

Ancient Origins: Yule - the Celts believed this parasitic plant held the soul of the host tree.

The Mistletoe Center a global mistletoe resource since 1997

Kissing Under the Mistletoe The Druids considered the mistletoe to be a sacred plant and believed it had miraculous properties which could cure illnesses, serve as an antidote against poisons, ensure fertility and protect against the ill effects of witchcraft.

The Noble Foundation Plant Image Gallery holdings for Grasses and grasslike plants can be accessed by: Indexed by common and scientific name.

Weed Science Society of America

Invasive and Exotic Species of North America is a site that compiles images & information on invasive weeds, insects, diseases, other invasive or exotic oganisms and biological control agents. Although much of the data is offsite at the USDA PLANTS database and at forestimages.org, the most novel feature of this site is its ability to create flexible lists by scientific name, family, order or common name.

Common Weed Seedlings of Michigan is a useful one page guide to identifying lawn weeds that is packed with information and nearly 100 photos of weeds, with adherent seed coats or cotyledons showing. Although the site features 33 common Michigan weeds, most species are also found elsewhere.

Kudzu - The Vine Kudzu is perhaps one of the most terrifying success stories of introduced alien plants -- a veritable ecological epidemic in the southeastern US. Growing by up to a foot a day, it overtakes and covers canopies.

Swedish weeds consisting of daily haikus and photo entries of individual weeds.

Weeds Gone Wild: Alien Plant Invaders of Natural Areas is a web-based project of the Plant Conservation Alliance's Alien Plant Working Group, that provides information for the general public, land managers, researchers, and others on the serious threat and impacts of invasive alien (exotic, non-native) plants to the native flora, fauna, and natural ecosystems of the United States. 

Ergonica.com/ We are surrounded by weeds. Ever since man began planting and cultivating plants, weeds have been a problem. A weed is any plant in the wrong place.The World of Weeds Link Index and the top frame will provide quick access to the numerous gardening tips and horticultural databases

Weed Identification Guide at Virginia Tech (Blacksburg, Virginia, USA)A comprehensive identification guide containing weed images and botanical descriptions of common weeds and weed seedlings found throughout Virginia and the Southeastern U.S.

INVADERS Database System