| Abbrev | Name | Spec | Type | Locality |
|---|---|---|---|---|
| WST | WEBSTER[1281]; | TR.AE | S | USA |
| WTE | WILLET-ENANO[144][1281]; | TR.AE | S | MEX |
| WW,1 | WAGGA-WAGGA[1281]; | TR.AE | AUS | |
| XA | XAPECO[145][1281]; | TR.AE | S | BRA |
| XAV | XAVANTES[145][1281]; | TR.AE | S | BRA |
| Y | YAQUI[144][1281]; | TR.AE | S | MEX |
| YAV79 | YAVAROS-79[115][1281]; | TR.DR | S | MEX |
| YCO | YRELLOURICO[1281]; | TR.AE | CYP | |
| YD | YDING[114][144][1281]; | TR.AE | S | MEX |
| YEL | YELLOWLEGS[115][3692]; | TR.DR | S | MEX |
| YFN | YAFEN[145][114][144][1281]; | TR.AE | CHL,MEX | |
| YH | YAMHILL | TR.AE | W | USA |
| YKN | YUKON,MEX[144][1281]; | TR.AE | S | MEX |
| YMH | YAMHILL[144][1281]; | TR.AE | USA | |
| YNA | YAMUNA[1281]; | TR.DR | S | SYR |
| YNY | YANAN-YAOMAI[740]; | TR.AE | CHN | |
| YO | YEOMAN,GBE[145] | TR.AE | GBE | |
| YR | YECORA-70[145][114][144][1281]; | TR.AE | S | MEX |
| YRR | YECORA-ROJO[114][144][1281]; | TR.AE | S | USA |
| YRT | YECORATO-77[114][144][1281]; | TR.AE | S | MEX |