Discover Life
"Discover Life provides free on-line tools to identify species, share ways to teach and study nature's wonders, report findings, build maps, process images, and contribute to and learn from an encyclopedia of life that now contains 305,071 species."[The] mission is to assemble and share knowledge in order to improve education, health, agriculture, economic development, and conservation throughout the world.to assemble and share knowledge in order to improve education, health, agriculture, economic development, and conservation throughout the world." [from website]IDnature guides currently available for:
Plants
Vertebrates
Insects
The Trees, Shrubs and Vines (of North America) includes 1339 species. Fungi (of North America) has 234 species). IDnature guides can search on a full range plant characteristics (e.g. bark, foliage, flowers and fruit) to help student correctly identify species.
Identification
International