Provides gardening tips, featured plant, answers your questions, and a quiz to test plant knowledge.
Flora of North America
Publishes information on the names, taxonomic relationships, continent-wide distributions, and morphological characteristics of all plants native and naturalized found in North America north of Mexico.
Community-powered online plant identification database. Allows users to submit plant leaf images for identification.
The Plant List
Growing list of all identified and described plant species from bryophytes to gymnosperms and angiosperms.