The International Plant Names Index (IPNI), 2007 - 2011, database (version 2011)
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
U. S. Fish and Wildlife Service
Endangered and Threatened Wildlife and Plants; Review of Plant Taxa for Listing as Endangered or Threatened Species
Journal/Book Name, Vol. No.:
Federal Register, vol. 58, no. 188
Continental US, Native
US ESA: Potential candidate without sufficient data on vulnerability, as published in Federal Register Volume 58, Number 188, Pages 51144 - 51190, September 30, 1993
ITIS taxonomy is based on the latest scientific consensus available,
and is provided as a general reference source for interested parties.
However, it is not a legal authority for statutory or regulatory purposes.
While every effort has been made to provide the most reliable and up-to-date
information available, ultimate legal requirements with respect to species
are contained in provisions of treaties to which the United States is a
party, wildlife statutes, regulations, and any applicable notices that have
been published in the Federal Register. For further information on U.S.
legal requirements with respect to protected taxa, please contact the
U.S. Fish and Wildlife Service.