Last updated October 1, 2009
| Name | Family | Nativity |
| Wallichia disticha | Arecaceae | Himalayas |
| Washingtonia filifera | Arecaceae | SW United States |
| Washingtonia robusta | Arecaceae | NW Mexico |
| Weberbauerocereus callanus | Cactaceae | Peru |
| Weberbauerocereus cuzcoensis | Cactaceae | Peru |
| Weberbauerocereus johnsonii | Cactaceae | Peru(Cajamarca) |
| Weberbauerocereus longicomus | Cactaceae | Peru(Cajamarca) |
| Weberbauerocereus rauhii | Cactaceae | Peru |
| Weberbauerocereus sp. | Cactaceae | Peru |
| Weberbauerocereus weberbaueri | Cactaceae | S Peru, N Chile |
| Weberbauerocereus weberbaueri v. horribilis | Cactaceae | S Peru, N Chile |
| Weberbauerocereus winterianus | Cactaceae | Peru |
| Weberbauerocereus winterianus v. australis | Cactaceae | Peru |
| Welwitschia mirabilis | Welwitschiaceae | Angola, Namibia |
| Werauhia werckliana | Bromeliaceae | |
| Werckleocereus glaber v. mirandae | Cactaceae | Mexico |
| Westringia cv. Morning Light | Lamiaceae | |
| Westringia fruticosa | Lamiaceae | Australia(New South Wales) |
| Westringia fruticosa cv. Smokey | Lamiaceae | |
| Widdringtonia nodiflora | Cupressaceae | S. Africa, Mozambique,Zimbabwe |
| Widdringtonia schwarzii | Cupressaceae | South Africa(E Cape Prov.) |
| Wigandia caracasana | Hydrophyllaceae | |
| Winterocereus aureispinus | Cactaceae | Bolivia |
| Wisteria floribunda | Fabaceae | Japan |
| Wisteria sinensis | Fabaceae | China |
| Wittrockia superba | Bromeliaceae | Brazil |
| Wollemia nobilis | Araucariaceae | Australia(New South Wales) |
| Woodwardia fimbriata | Blechnaceae | California to Baja California |
| Woodwardia radicans | Blechnaceae | Europe |
| Woodwardia unigemmata | Blechnaceae | E. Asia |
| Woodwardia unigemmata | Blechnaceae | Taiwan |
