CHROMOSOME COUNTS IN THE MENTHA COLLECTION AT THE USDA-ARS NATIONAL-CLONAL-GERMPLASM-REPOSITORY

The present chromosome number survey is based on the holdings of the National Clonal Germ-plasm Repository in Corvallis, which houses a world Mentha collection which includes most of the known taxa. The survey complements previously published counts and provides information about 73 accessions that are available to researchers. It includes chromosome counts for two accessions of M. australis, a previously uncounted Australian endemic, and accessions of M. japonica, M. diemenica, and M. cunninghamii, taxa with but one or a few published previous counts.