This data set includes county-level occupancy for native and exotic plants in 47 US states
List containing a
data.frame for the native species in
each state and a second
the exotic species in each state. Each data frame is organized with
counties as columns and species as rows.
Per the USDA PLANTS Database website, species were listed as "native" if their L48 native status was listed as N, N?, NI, or NI? and "exotic" if their L48 native status was listed as GP, GP?, I, I?, N?I, W, or W?. See http://plants.usda.gov/about_adv_search.html for descriptions of these terms.
The USDA PLANTS Database does not include county-level data on Alaska or Maryland. Hawaii was excluded from this data set because L48 native status did not apply to it.
The USDA PLANTS Database can be found at http://plants.usda.gov/
USDA, NRCS. 2010. The PLANTS Database (http://plants.usda.gov, November 23, 2010). National Plant Data Center, Baton Rouge, LA 70874-4490 USA.
Used as an example in Harris et al. 2011. "Occupancy is nine-tenths of the law" The American Naturalist.
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.