National Plant Data Center, NRCS, USDA. Baton Rouge, LA 70874-4490 USA. http://plants.usda.gov
Reference for:
Knautia arvensis
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:
Knautia arvensis
Source:
The International Plant Names Index (IPNI), 2007 - 2011
Acquired:
2011-01-01
Notes:
The International Plant Names Index, botanical information system from the Royal Botanic Gardens, Kew, the Harvard University Herbaria, and the Australian National Herbarium, available at http://www.ipni.org/index.html
Reference for:
Knautia arvensis
Source:
Dipsacaceae of North America Update
Acquired:
2011-03-30
Notes:
Updated for ITIS by the Flora of North America Expertise Network, in connection with an update for USDA PLANTS (2007-2010)