because the combination was ascribed to Nuttall, and he was acknowledged in the preface to the work for his contribution, he is the author of this name (Melbourne ICN Art. 46.2)
Name verified on: 02-Jan-1995 by ARS Systematic Botanists. Last updated: 21-May-2013 Species priority site is: National Arboretum (NA).
Images Note: Be advised that their identity may be
inaccurate. Proper identification of a plant may require
specialized taxonomic knowledge or comparison with
properly documented herbarium material.