database: Asteraceae of North America Update; Update coordinated by the International Compositae Alliance (TICA) (http://www.compositae.org/) through the Smithsonian Institution in collaboration with the USDA National Plant Data Center
database: NODC Taxonomic Code;
database: The PLANTS Database; National Plant Data Center, NRCS, USDA. Baton Rouge, LA 70874-4490 USA. http://plants.usda.gov
database: The PLANTS Database; National Plant Data Center, NRCS, USDA. Baton Rouge, LA 70874-4490 USA. http://plants.usda.gov
