| Substanz | Abkürzung | Systematik | Provings |
| X-Ray Röntgenstrahlen X-Ray |
X-Ray | Radiatio artifcialis |
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| Xanthium spinosum Dornige Spitzklette Spiny clot-bur |
Xanth | Asteraceae/ Compositae |
|
| Xanthoceras sorbifolium Yellowhorn |
Xance-s | Sapindaceae |
|
| Xanthocyparis nootkatensis Nootka-Scheinzypresse Nootka Cypress |
Xanthocy-n | Cupressaceae |
|
| Xanthorrhoea arborea |
Xanrhoe | Xanthorrhoeaceae |
|
| Xanthosoma robustum Elegant Leaf |
Xantho-r | Araceae |
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| Xanthoxylum americanum Zahnwehbaum Prickly Ash |
Xan | Rutaceae |
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| Xantorrhiza apifolia Shrub Yellow Root |
Xanrhi | Ranunculaceae |
|
| Xenon Xenon Xenon |
Xeno | Xenon |
|
| Xenopus gilli Kap-Krallenfrosch Cape Clawed Toad |
Xenop-g | Pipidae |
|
| Xerocomus badinus Maronenröhrling Bay bolete |
Xeroc-b | Boletaceae |






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