| Name | Accession number | Synonym | Species | Habit | Locality |
|---|---|---|---|---|---|
| SYCHUAN-BAI-MAI | K-43016 | SYUAN-BAI-MAI[541]; | TR.AE | S | CHN:Sichuan |
| SYCHUAN-SI-TSUN | K-43014 | TR.AE | S | CHN:Sichuan | |
| SY-CLEARSTONE-2-CL | PI-668090 | MTCL-1077[4137]; SY-CLEARSTONE[4262]; | TR.AE | W | USA:Montana |
| SY-CYPRESS | PI-672583 | TR.AE | USA:Iowa | ||
| SYDA-135 | K-43616 | TR.AE | S | EGY | |
| SYDA-139 | K-43615 | TR.AE | S | EGY | |
| SYENE | TR.DR | FRA | |||
| SY-EPSON | TR.AE | W | GBR | ||
| SY-FERRY | TR.AE | W | DEU | ||
| SY-FLINT | TR.AE | W | USA | ||
| SYG | II-19792[2331]; | TR.AE | S | MEX | |
| SY-GOLD | PI-659809 | 00-X-0100-51[3486]; AP-00-X-0100-51[4361]; | TR.AE | W | USA |
| SY-GOLIAD | PI-659784 | 00-S-0211-29-4[2965]; | TR.AE | S | USA |
| SY-HARRISON | PI-664946 | B-05-0154[2965]; | TR.AE | W | USA:Colorado |
| SY-INGMAR | PI-672586 | 04-S-0258-12[2965]; | TR.AE | USA | |
| SY-LIANO | PI-672579 | AP-09-T-9614[2965]; | TR.AE | USA | |
| SYLVA | K-57743; K-60547 | HE-406[40][1592]; | TR.AE | S | CZE:Morava |
| SYLVAN | PI-578867 | UT-002464[1535]; UT-86-S-688-2464[1535]; | TR.AE | S | USA:Utah,Colorado |
| SYLVIA | K-46607; PI-315849; PI-338010; AUS-22143 | TR.AE | W | DEU | |
| SYLVIE | 01C0107369 | SG-S-191-01[4358]; | TR.AE | W | SVK |