You selected Trifolium microdon var. pilosum Eastw. This is a synonym for:

Accepted scientific name:
Trifolium microdon Hook. & Arn. (accepted name)
Synonyms:
Trifolium chrysanthum Hook. & Arn. (synonym) 2 literature references for Trifolium chrysanthum Hook. & Arn.
Trifolium lechleri Phil. (synonym) 2 literature references for Trifolium lechleri Phil.
Trifolium microdon var. pilosum Eastw. (synonym) 2 literature references for Trifolium microdon var. pilosum Eastw.
Trifolium tricuspidatum Steud. (synonym) 2 literature references for Trifolium tricuspidatum Steud.
Common names:
Common name Language Country
thimble clover - USA Click here to show the literature
 reference
Classification:
Plantae
Phylum Magnoliophyta
Class Magnoliopsida
Order Fabales
Family Fabaceae
Genus Trifolium
Distribution: Canada (native); Chile (native); United States (native)
Additional data: Climbing: Not climbing, Habit: Herb, Lifespan: Annual
Source database: ILDIS, 10.01, May 2007
Latest taxonomic scrutiny: Roskov Y.R., 2005-2006
Online resource: http://www.ildis.org/LegumeWeb?version~10.01&LegumeWeb&tno~12096
CoL taxon LSID: urn:lsid:catalogueoflife.org:taxon:e6909834-29c1-102b-9a4a-00304854f820:ac2010