USDA, NRCS. 2007. The PLANTS Database (http://plants.usda.gov,
14 March 2007). National Plant Data Center, Baton Rouge, LA
70874-4490 USA. |
Britton, N.L., and A. Brown. 1913. Illustrated flora of
the northern states and Canada. Vol. 1: 62. Courtesy of Kentucky
Native Plant Society. Scanned by Omnitek
Inc.
|
