National Plant Data Center, NRCS, USDA. Baton Rouge, LA 70874-4490 USA. http://plants.usda.gov
Reference for:
Cycadopsida
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:
Cycadopsida
Source:
ITIS & Species 2000 Catalogue of Life Management Hierarchy, 2014
Acquired:
2014-11-25
Notes:
M. Ruggiero & D. Gordon, eds. 2014. Consensus Management Hierarchy for the ITIS & Species2000 Catalogue of Life. Contributors: Nicolas Bailly, Thierry Bourgoin, Richard Brusca, Thomas Cavalier-Smith, Daphne Fautin, Dennis Gordon, Gerald Guala, Michael Guiry, Paul Kirk, Elliot Lefkowitz, David Mabberly, David Maddison, Alan Paton, Michael Ruggiero, Peter Stevens, and Brian Tyndall