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The Center for Plant Conservation (CPC) is dedicated solely to preventing the extinction of U.S. native plants. The Center is a network of 39 leading botanic institutions. the Center operates the only coordinated national program of off-site (ex situ) conservation of rare plant material. This conservation collection ensures that material is available for restoration and recovery efforts for these species. CPC also works in research, restoration, technical assistance, education and advocacy through the efforts of the network and the national office.
Go Orchids is a tool to explore orchids native to the U.S. and Canada. Find information about orchids by searching the site by orchid name, location, or by answering a few questions to identify by key.
CNPS has tracked plants that are rare from a statewide perspective since the late 1960's with over 2,000 taxa currently considered by CNPS to be rare statewide. The mission of the CNPS Rare Plant Program is to develop current, accurate information on the distribution, ecology, and conservation status of California's rare and endangered plants, and to use this information to promote science-based plant conservation in California.
The IUCN Red List is the world's most comprehensive inventory of the global conservation status of plant and animal species. It uses a set of criteria to evaluate the extinction risk of thousands of species and subspecies.
This site contains draft Red List conservation assessments completed as part of the Sampled Red List Index for Plants project. Please register and post a comment if you know anything relating to the conservation status of a species from the sample. Please note that all assessments are pending approval for listing on the IUCN Red List website, unless otherwise stated
An interactive website accompanying the annual State of the World's Plants. This report provides, for the first time, a baseline assessment of our current knowledge on the diversity of plants on earth, the global threats these plants currently face, and the policies in place and their effectiveness in dealing with these threats.
The goal of this website is to provide in a single location all of the information that we and our collaborators have accumulated on the taxonomy and biology of the Brazil nut family.

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ARKive is gathering together the very best films and photographs of the world's species into one centralized digital library, to create a unique audio-visual record of life on Earth, prioritizing those species at most risk of extinction.
The Gentian Research Network is a free, not-for-profit, web-based forum for worldwide research on the natural history and evolution of the flowering plant family Gentianaceae (gentians). Here you will find information on current research projects in the Gentianaceae, focusing on their systematics, evolution, molecular systematics, classification (Struwe et al. 2002 or most current), ecology, biogeography, endangered species, biodiversity, distribution, anatomy, morphology, palynology, ethnobotany, and nomenclature. We also have a link to a large reference list, floristic works, images, research projects, and contact information for researchers and photographers.
JSTOR has created a high-quality, interdisciplinary archive of scholarship, is actively preserving over one thousand academic journals in both digital and print formats
New York Botanical Garden authorized users only. Only those titles subscribed to by NYBG are available in Full Text if published after 1923. ALL content in JSTOR is available if published prior to 1923.