</a> Courtesy Smithsonian Institution National Numismatic Collection. Rare Currency at The Smithsonian The previous coin's older brother the 1849, Gold Rush era double eagle gold coin is valued by collectors the world over. It was the United States of America's first $20 denominational gold coin. Courtesy Smithsonian Institution National Numismatic Collection.
subspecies - (biology) a taxonomic group that is a division of a species; usually arises as a consequence of geographical isolation within a species. race. biological science, biology - the science that studies living organisms. taxon, taxonomic category, taxonomic group - animal or plant group having natural relations.
varieties. 1  1 : the quality or state of having different forms or types : multifariousness. 2  2 : a number or collection of different things especially of a particular class : assortment. 3  3a : something differing from others of the same general kind : sortb : any of various groups of plants or animals ranking below a species : subspecies.