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