* Pasture and Roadside Flowering Plants
Pasture and roadside flowering plants, Goodwell and Texhoma, Texas County, Oklahoma. By Kurt Schaefer. Excellent photos -- most are native species, but some are non-native.
* MissouriPlants.com
Photographs and descriptions of the flowering and non-flowering plants of Missouri, USA. By Dan Tenaglia. Excellent photos, including many closeups -- 1085 species are pictured (as of Feb 2008).
* MissouriPlants.com links page
Good guide to other web places with photos of eastern USA plants.
* Identification and Study of Plants: Texas and Nearby States
(BRIT website links)
* Invasive.org
Good photos of many non-native species in the USA. 629 species of "invasive and exotic weeds."
* TexasInvasives.org
Includes photos of many species that are non-native in Texas.
