| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Xiphidiopicus Bonaparte 1854 | 1 | 0 | 0 |
| Xiphidiopicus percussus (Temminck 1826) (Cuban Green Woodpecker) | 0 | 2 | 0 |
| Xiphiidae (swordfishes) | 1 | 0 | 0 |
| Xiphosura | 1 | 2 | 0 |
| Xylanthemum | 0 | 2 | 0 |
| Xylariaceae | 1 | 0 | 0 |
| Xylariales | 1 | 0 | 0 |
| Xylariomycetidae | 1 | 0 | 0 |
| Xylocopa Latreille 1802 (Carpenter Bees) | 0 | 2 | 0 |
| Yersinia | 3 | 2 | 0 |
| Yersinia enterocolitica | 0 | 2 | 0 |
| Yersinia pestis | 0 | 2 | 0 |
| Yersinia pseudotuberculosis | 0 | 2 | 0 |
| Yucca (yucca) | 1 | 2 | 0 |
| Yucca schidigera Roezl ex Ortgies (Mojave yucca) | 0 | 2 | 0 |
