G.L. Nesom's scientific contributions

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Publication (1)

ICBN clarification needed: Use of ranks
Article
  • Dec 2005
The current (2000) International Code of Botanical Nomenclature is open to divergent interpretation regarding the use of ranks. Article 4.1 outlines secondary ranks to be used between the principal ranks of family and species and below species. Article 4.2 states that ranks prefixed by "sub-" (termed here as "tertiary" rank, immediately subsidiary...
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Citations

... However, the presence of numerous intermediate specimens violates most commonly accepted taxonomic conceptions of species status. Subspecies as a taxonomic rank is poorly defined in the literature of taxonomic botany and is used more or less interchangeably with variety (McDade 1995;Nesom and Lipscomb 2005). Wiegand (1912), Fernald (1950a) and Jones (1946) assigned the rank of variety to those distinctive forms of Amelanchier that occupied a particular geographical area and/or had a habitat preference slightly different than that typical of the species. ...
Reference: Morphometric analysis of an Amelanchier (Rosaceae: Maloideae) complex on the delmarva peninsula (Delaware, Maryland and Eastern Virginia) resolves the taxonomic identities of Amelanchier obovalis and A. Canadensis
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