The Native Plants of Nevada Index is based upon the USDA PLANTS Database (USDA Natural Resource Conservations Service).
USDA, NRCS. 2009. The PLANTS Database (http://plants.usda.gov, 16 June 2009). National Plant Data Center, Baton Rouge, LA 70874-4490 USA.
From the PLANTS web site:
PLANTS is a collaborative effort of the USDA NRCS National Plant Data Center (NPDC), the USDA NRCS Information Technology Center (ITC), The USDA National Information Technology Center (NITC), and many other partners. Much of the PLANTS data and design is developed at NPDC, and the Web application is programmed at ITC and NITC and served through the USDA Web Farm. Here’s more information about who does what on the PLANTS Team, our Partners, and our Data Contributors.