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It will be seen later that a different concept underlies the naming of cultivated plants which does not make such an assumption but recognizes the possibility that cultivars may straddle species, or other, boundaries or overlap each other, or be totally contained, one by another. The rules by which botanical infraspecific taxa are named specify that the name shall consist of the name of the parent species followed by a term which denotes the rank of the subdivision, and an epithet which is formed in the same ways as specific epithets, including grammatical agreement when adjectival.
Categories below the rank of species The subdivision of a species group is based upon a concept of infraspecific variation which assumes that, in nature, evolutionary changes are progressive fragmentations of the parent species. Put in another way, a species, or any taxon of lower rank, is a closed grouping whose limits embrace all their lower-ranked variants (subordinate taxa). It will be seen later that a different concept underlies the naming of cultivated plants which does not make such an assumption but recognizes the possibility that cultivars may straddle species, or other, boundaries or overlap each other, or be totally contained, one by another.
Their inclusion emphasizes the need for uniformity in the ways in which names are constructed and provides a small warning that there are in print many deviant names, some intentional and some accidental. Many of the epithets which may cause confusion are either classical geographic names or terms which retain a meaning closer to that of the classical languages. There are many more such epithets than are listed in this glossary. 31 Glossary a, ab away from-, downwards-, very-; (privative) un-, withoutaaronis for the prophet Aaron, Aaron’s Abaca a synonym for Musa textilis abactus -a -um repelling, repulsive, driving away, abigo, abigere, abegi, abactum abayensis -is -e from the environs of Lake Abaya, Ethiopia abbreviatus -a -um shortened, ab-brevis (abbrevio, abbreviare) abchasicus -a -um, abschasicus -a -um from Abkhasia in the Caucasus abditus -a -um hidden, removed, past participle of abdo, abdere, abdidi, abditum Abelia for Dr Clarke Abel (1780–1826), physician and writer on China abeliceus -a -um Abelia-like Abeliophyllum Abelia-leaved (similarity of foliage) aberconwayi for Charles Melville McLaren (1913–2003) third Lord Aberconway of Bodnant, former President of the RHS.