Searching by Genus
When the genus is known, you can use an online report to search and obtain a resulting list of species for that genus.
Copy the full taxon into the Search box (under the Advanced Search tab) if you want to see a list of accessions for that species.
Alternatively, start a search with only the Genus and a wildcard, such as Medicago%. When the resulting accessions are displayed, you can then add more text to the search string, such as "Medicago sativa."