Taxonomic Resources
- http://plants.usda.gov (accessed 3/5/2016)-HYPOPT #HYPOPT
- USDA, NRCS, The PLANTS Database, http://plants.usda.gov. National Plant Data Team, accessed March 5, 2016
- http://plants.usda.gov (accessed 3/5/2016)-HYPOPTSPP #HYPOPTSPP
- USDA, NRCS, The PLANTS Database, http://plants.usda.gov. National Plant Data Team, accessed March 5, 2016