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×Hesperotropsis, a new nothogenus for intergeneric crosses between Hesperocyparis and Callitropsis (Cupressaceae), and a review of the complicated nomenclatural history of the Leyland cypress

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The widely cultivated Leyland cypress, a hybrid between Nootka cypress and Monterey cypress that was originally named Cupressus ×leylandii, exemplifies the instability of names of nothogenera when there are changes in generic placement of the parental taxa. Because of recent phylogenetic research, the parent species of Leyland cypress have each been put in four different genera, leading to 13 possible nothospecific names for this hybrid. Here we present the correct nomenclature for the Leyland cypress under these different taxonomic concepts. We also propose a new nothogenus, ×Hesperotropsis, for crosses between Hesperocyparis and Callitropsis, and publish three new combinations in ×Hesperotropsis, including ×Hesperotropsis leylandii for the Leyland cypress.
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Keywords: CALLITROPSIS; CUPRESSACEAE; HESPEROCYPARIS; LEYLAND CYPRESS; NOMENCLATURE OF NOTHOTAXA; ×HESPEROTROPSIS

Document Type: Research Article

Affiliations: 1: National Plant Data Team, Natural Resources Conservation Service, United States Department of Agriculture, 2901 East Lee Street, Suite 2100, Greensboro, North Carolina 27401, U. S. A.;, Email: [email protected] 2: National Plant Data Team, Natural Resources Conservation Service, United States Department of Agriculture, 2901 East Lee Street, Suite 2100, Greensboro, North Carolina 27401, U. S. A.

Publication date: 13 June 2012

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