Before revision: Botanical Journal of the Linnean Society, Volume 111, Issue 4, April 1993, Pages 471–504, URL Contortae is a subsection of the genus pinus .Nicholas C.Wheeler, Raymond P.Guries, David M.O'Malley.
After revision: Botanical Journal of the Linnean Society, Volume 111, Issue 4, April 1993, Pages 471–504, URL Contortae is a subsection of the genus Pinus .Nicholas C.Wheeler, Raymond P.Guries, David M.O'Malley.