Director, Curator, Robert F. Hoover Herbarium, Biological Sciences Department, California Polytechnic State University, San Luis Obispo, CA 93407, USA
Reference for:
Cirsium
Source(s):
Source:
NODC Taxonomic Code
Acquired:
1996-07-29
Notes:
Reference for:
Cirsium
Source:
The PLANTS Database
Acquired:
1996-07-26
Notes:
National Plant Data Center, NRCS, USDA. Baton Rouge, LA 70874-4490 USA. http://plants.usda.gov
Reference for:
Cirsium
Source:
The PLANTS Database
Acquired:
2000-01-21
Notes:
National Plant Data Center, NRCS, USDA. Baton Rouge, LA 70874-4490 USA. http://plants.usda.gov
Reference for:
Cirsium
Source:
Asteraceae of North America Update
Acquired:
2010-05-13
Notes:
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