The Calflora Database is a nonprofit organization providing information about California plant biodiversity for use in education, research and conservation. www.calflora.org
The California Invasive Plant Council site contains much information about invasive plants in California’s precious natural areas. www.cal-ipc.org
The California Native Grasslands Association has a lot of information on native grasslands and how to preserve and protect them. www.cnga.org
The California Native Plant Society works to protect California’s native plant heritage and preserve it for future generations. www.cnps.org
The California Society for Ecological Restoration is a non-profit membership-based organization dedicated to bringing about the recovery of damaged California ecosystems. www.sercal.org
The Centre for Biological Diversity works towards protecting biodiversity, with field offices in various states. www.biologicaldiversity.org
The mission of the Lady Bird Johnson Wildflower Center is to increase the sustainable use and conservation of native wildflowers, plants and landscapes. Look for the Native Plant information network. www.wildflower.org
NatureServe Explorer is an authoritative source for information on more than 70,000 plants, animals and ecosystems of the United States and Canada—with particularly in-depth coverage of rare and endangered species. www.natureserve.org/explorer
PlantRight lists invasive plants, and suggests non-invasive plants for use in different areas of California. www.plantright.org
The Plants Database provides standardized information about the vascular plants, mosses, liverworts, hornworts and lichens of the United States and its territories. Here you will find native plants listed state by state. www.plants.usda.gov
The Botanical Society of the British Isles is the leading scientific society in Britain and Ireland for the study of plant distribution and taxonomy. Click on Resources for a county-by-county list of plants native to or found in those areas. Click Countries for European organizations. www.bsbi.org.uk
Buglife is Europe’s only organization devoted to the conservation of all invertebrates. Their site has lots of useful information on bugs. www.buglife.org.uk
The flora of the Channel Islands is recorded on www.flora.org.gg.
The Grasslands Trust is the only national charity working specifically to protect the UK’s wildflower-rich grasslands. www.grasslands-trust.org
Kew Grassbase is a great reference for researching grasses. www.kew.org/data/grassbase/index.html
The National Biodiversity Network gathers and records information on biodiversity. Click NBN Gateway for distribution of native species. www.nbn.org.uk
The Natural History Museum’s excellent Web site contains the Postcode Plants database; just type in your postcode to find plants native to your area. www.nhm.ac.uk/nature-online/life/plants-fungi/postcode-plants/intro.html
The European Dry Grassland Group is a network of dry grassland researchers and conservationists in Europe. www.edgg.org