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Botanical Nomenclature Plants may have many common names Plants have only one scientific name Scientific names are universally accepted Binomial System of Classification Invented by the Swedish naturalist Linnaeus in the year 1753 The genus comes first and is always capitalized and italicized The specific epithet comes after the genus and is always lower case and italicized The Species The genus and specific epithet together form the “binomial” that identifies a species Example: Cercis canadensis Eastern Redbud A group of individual plants that have a common set of identifiable characteristics that are inheritable Species come “true-to-type” from seed The Variety A group of plants subordinate to the species; differing from the species in one or more inheritable characteristics Varieties come “true-to-type” from seed Written in lower case and italicized Two acceptable formats: Cercis canadensis var. alba or Cercis canadensis alba The Variety Cercis canadensis Cercis canadensis var. alba The Cultivar In ornamental horticulture cultivar characteristics are, generally speaking, not inheritable Cultivars, generally speaking, do not come “true-to-type” from seed Cultivar names are always capitalized and written in single quotations Example: Cercis canadensis ‘Forest Pansy’ has maroon leaves that fade to green The Cultivar A single species may have many cultivars Juniperus horizontalis ‘Blue Chip’ Juniperus horizontalis ‘Plumosa’ Juniperus horizontalis ‘Hughes’ etc. It is possible to have a cultivar of a variety Gleditsia triacanthos inermis ‘Skyline’ or Cornus florida rubra ‘Cherokee Chief’ Gleditsia triacanthos Gleditsia triacanthos var. inermis Gleditsia triacanthos var. inermis ‘Skyline’ The End