You selected Arnica intermedia Howell ex Rydb. This is a synonym for:

Accepted scientific name:
Arnica latifolia Bong. (provisionally accepted name)
Synonyms:
Arnica aphanactis Piper (synonym)
Arnica aprica Greene (synonym)
Arnica betonicifolia Greene (synonym)
Arnica eriopoda Gand. (synonym)
Arnica flodmanii Rydb. (synonym)
Arnica glabrata Rydb. (synonym)
Arnica grandifolia Greene (synonym)
Arnica granulifera Rydb. (synonym)
Arnica intermedia Howell ex Rydb. (synonym)
Arnica laevigata Greene (synonym)
Arnica leptocaulis Rydb. (synonym)
Arnica membranacea Rydb. (synonym)
Arnica menziesii Hook. (synonym)
Arnica oligolepis Rydb. (synonym)
Arnica paucibracteata Rydb. (synonym)
Arnica platyphylla A.Nelson (synonym)
Arnica puberula Rydb. (synonym)
Arnica teucriifolia Greene (synonym)
Arnica ventorum Greene (synonym)
Common names: -
Classification:
Plantae
Phylum Magnoliophyta
Class Magnoliopsida
Order Asterales
Family Asteraceae
Genus Arnica
Distribution: -
Additional data: Data Providers: Govaerts World Compositae Checklist A-G, IPNI, Tropicos, LCR Editor. GCC LSID: urn:lsid:compositae.org:names:1B76449C-B4A9-4F5D-80C8-A76B114D17D1
Source database: GCC, 1 (Beta), Nov 2009
Latest taxonomic scrutiny: Flann C., 14-Oct-09
Online resource: -
CoL taxon LSID: urn:lsid:catalogueoflife.org:taxon:1f32d6a2-60a7-102d-be47-00304854f810:ac2010