Major items
| Organic | Scientific name | Common name | Part | Origin |
| Waltheria douradinha | leaf, stem | S-America | ||
| Warburgia salutaris (G Bertol) Chiov | Pepper Bark Tree | leaf | S-Africa | |
| Warczewiczella ionoleuca | Ecuador | |||
| Warczewiczella palatina | Ecuador | |||
| Warczewiczella timbiensis | Ecuador | |||
| Weberbauerocereus johnsonii | America | |||
| Weberocereus bradei | America | |||
| Weingartia kargliana | America | |||
| Weingartia lanata(Rebutia neocumingii) | America | |||
| Weingartia multispina | America | |||
| Weingartia pulquinensis(Rebutia neocumingii) | America | |||
| Weingartia westii | America | |||
| Werckleocereus tonduzii | America | |||
| Whitmania pigra Whitman / Hirudo nipponica Whitman / Whitmania acranulata Whitman | SE Asia | |||
| Wigginsia corynodes | America | |||
| Wigginsia pauciareolata | America | |||
| Wigginsia sellowii(Parodia sellowii) | America | |||
| Wigginsia turbinata(Parodia turbinata) | America | |||
| Wigginsia vorwerkiana | America | |||
| Wilcoxia albiflora | America | |||
| Wilcoxia kroenleinii | America | |||
| Wilcoxia nerispina | America | |||
| Wilcoxia schmollii | Lamb's tail cactus | America | ||
| Wilcoxia waldeisii(Echinocereus waldeisii) | America | |||
| Wilmattea minutiflora | America | |||
| Withania coagulans (Stocks) Dunal | Vegetable rennet | Indian Sub | ||
| Withania somnifera (L) Dunal | Ashwagandha | root | S-Asia | |
| Wyethia helenioides (DC) Nutt |
