National Plant Data Center, NRCS, USDA. Baton Rouge, LA 70874-4490 USA. http://plants.usda.gov
Reference for:
Verbena officinalis
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:
Verbena officinalis
Source:
Kew family checklist, 2011
Acquired:
2011-01-01
Notes:
Kew World Checklist of Selected Plant Families, botanical information system at the Royal Botanic Gardens, Kew, available at http://apps.kew.org/wcsp/home.do
Reference for:
Verbena officinalis
Source:
Lamiales of North America Update
Acquired:
2011-05-26
Notes:
Updated for ITIS by the Flora of North America Expertise Network, in connection with an update for USDA PLANTS (2007-2010)