| Substance | Abbreviation | Systematics | Provings |
| Wachendorfia thyrsiflora Bloodroot |
Wache-th | Haemodoraceae |
|
| Wahlenbergia hederacea Ivy-leaved bellflower |
Wahl-h | Campanulaceae |
|
| Warburgia salutaris Pepper-bark tree |
Warb-s | Canellaceae |
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| Warfarinum Warfarin |
Warfar | Herbicida, Pesticida et Toxica alia Synthetic Drugs |
|
| Watsonia pillansii Bugle lily |
Wats-p | Iridaceae |
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| Weberocereus biolleyi |
Weber-b | Cactaceae |
|
| Weigela florida |
Weig-f | Caprifoliaceae |
|
| Weilbach Aqua |
Aq-weil | Aquae mineraliae |
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| Weinmannia rutenbergii |
Weinm-r | Cunoniaceae |
|
| Welwitschia mirabilis Welwitschia |
Welw-m | Welwitschiaceae |
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| Welwitschia mirabilis e radice Welwitschia root |
Welw-m-r | Welwitschiaceae |
|
| Werauhia singuliflora |
Wera-s | Bromeliaceae |
|
| Wercklea cocleana |
Werck-c | Malvaceae |
|
| West Nile Virus equi Vaccinum West Nile Equine Vaccine |
WNV-Vacc | Flaviviridae Vaccines |









