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From the Choice review: "This virtual library of online floras offers resources from leading international institutions of botanical research, including the monumental Flora of China and the Flora of North America, which are also published in print. All the floras at this site, which is managed and hosted by the Missouri Botanical Garden, are accessible through a uniform interface, and can be searched by plant family, genera, and print volume number."
From the website: "Use Plant Information Online to discover sources in 1074 North American nurseries for 104779 plants, find 357757 citations to 161488 plants in science and garden literature, link to selected websites for images and regional information about 19131 plants, and access information on 2631 North American seed and nursery firms. Plant Information Online is a free service of the University of Minnesota Libraries."