| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| WEFL | Weigela floribunda (Sieb. & Zucc.) K. Koch | crimson weigela | Caprifoliaceae
|
| WEFL2 | Weigela florida (Bunge) A. DC. | oldfashioned weigela | Caprifoliaceae
|
| WEIGE | Weigela Thunb. | weigela | Caprifoliaceae
|
| WEIGE2 | Weigelia Schreb. | weigelia | Caprifoliaceae
|
| WEAF | Weinmannia affinis A. Gray | weinmannia | Cunoniaceae
|
| WEPI | Weinmannia pinnata L. | bastard briziletto | Cunoniaceae
|
| WEINM | Weinmannia L. | weinmannia | Cunoniaceae
|
| WEAN | Weissia andersoniana Zand. | Anderson's weissia moss | Pottiaceae
|
| WEAN2 | Weissia andrewsii Bartr. | Weissia controversa | Pottiaceae
|
| WECO2 | Weissia condensa (Voit) Lindb. | condensed weissia moss | Pottiaceae
|
| WECOL | Weissia controversa Hedw. var. longiseta (Lesq. & James) Crum et al. | Weissia controversa | Pottiaceae
|
| WECOW | Weissia controversa Hedw. var. wolfii (Lesq. & James) Crum et al. | Weissia controversa | Pottiaceae
|
| WECO3 | Weissia controversa Hedw. | controverial weissia moss | Pottiaceae
|
| WEGL2 | Weissia glauca Bartr. | Weissia andersoniana | Pottiaceae
|
| WEHE | Weissia hedwigii Crum | Hedwig's weissia moss | Pottiaceae
|
| WEIN | Weissia inoperculata (Crum) Crum et al. | weissia moss | Pottiaceae
|
| WEJA | Weissia jamaicensis (Mitt.) Grout | Jamaican weissia moss | Pottiaceae
|
| WELI | Weissia ligulaefolia (Bartr.) Grout | liguleleaf weissia moss | Pottiaceae
|
| WELU | Weissia ludoviciana (Sull.) Reese & Lemmon | Astomum ludovicianum | Pottiaceae
|
| WEMI | Weissia microstoma (Hedw.) C. M�ll. | Weissia hedwigii | Pottiaceae
|
| WEMU | Weissia muehlenbergiana (Sw.) Reese & Lemmon | Astomum muehlenbergianum | Pottiaceae
|
| WEOC | Weissia occidentalis (Flow.) Stoneb. | Astomum occidentale | Pottiaceae
|
| WEPE | Weissia perligulata Flow. | Trichostomum crispulum | Pottiaceae
|
| WEPH | Weissia phascopsis Zand. | Astomum phascoides | Pottiaceae
|
| WEROP | Weissia rostellata (Hook. & Drumm.) Reese & Lemmon var. phascoides (Hook. & Drumm.) Reese & Lemmon | Astomum phascoides | Pottiaceae
|
| WESH | Weissia sharpii Anderson & Lemmon | Sharp's weissia moss | Pottiaceae
|
| WESW | Weissia sweetii Bartr. | Trichostomum crispulum | Pottiaceae
|
| WETO | Weissia tortilis (Schwaegr.) C. M�ll. | Weissia condensa | Pottiaceae
|
| WEVIA | Weissia viridula Hedw. ex Brid. var. australis Aust. | Weissia controversa | Pottiaceae
|
| WEVIW | Weissia viridula Hedw. ex Brid. var. wolfii Lesq. & James | Weissia controversa | Pottiaceae
|
| WEVI | Weissia viridula Hedw. ex Brid. | Weissia controversa | Pottiaceae
|
| WEISS | Weissia Hedw. | weissia moss | Pottiaceae
|
| WHMO | Whipplea modesta Torr. | common whipplea | Hydrangeaceae
|
| WHIPP | Whipplea Torr. | whipplea | Hydrangeaceae
|
| WHDE | Whitneya dealbata Gray | mock leopardbane | Asteraceae
|
| WHITN | Whitneya Gray | whitneya | Asteraceae
|
| WICAM | Wigandia caracasana Kunth var. macrophylla Brand | Wigandia urens var. caracasana | Hydrophyllaceae
|
| WIURC | Wigandia urens (Ruiz & Pav�n) Kunth var. caracasana (Kunth) D. Gibson | Caracus wigandia | Hydrophyllaceae
|
| WIUR | Wigandia urens (Ruiz & Pav�n) Kunth | Caracus wigandia | Hydrophyllaceae
|
| WIGAN | Wigandia Kunth | wigandia | Hydrophyllaceae
|
| WIFR2 | Wigginsia fricii (Arech.) D.M. Porter | | Cactaceae
|
| WIGGI | Wigginsia D.M. Porter | | Cactaceae
|
| WICA4 | Wijkia carlottae (Schof.) Crum | Carlott's wijkia moss | Sematophyllaceae
|
| WIJKI | Wijkia Crum | wijkia moss | Sematophyllaceae
|
| WIBA | Wikstroemia basicordata Skottsberg | Wikstroemia oahuensis var. oahuensis | Thymelaeaceae
|
| WIBIM | Wikstroemia bicornuta Hbd. ssp. montis-eke Skottsberg | Wikstroemia bicornuta | Thymelaeaceae
|
| WIBI | Wikstroemia bicornuta Hbd. | alpine false ohelo | Thymelaeaceae
|
| WICA | Wikstroemia caumii Skottsberg | Wikstroemia villosa | Thymelaeaceae
|
| WIDE | Wikstroemia degeneri Skottsberg | Wikstroemia oahuensis var. oahuensis | Thymelaeaceae
|
| WIEL | Wikstroemia elongata Gray | Wikstroemia oahuensis var. oahuensis | Thymelaeaceae
|
| WIEU | Wikstroemia eugenioides Skottsberg | Wikstroemia oahuensis var. oahuensis | Thymelaeaceae
|
| WIFO | Wikstroemia forbesii Skottsberg | Molokai false ohelo | Thymelaeaceae
|
| WIFU | Wikstroemia furcata (Hbd.) Rock | forest false ohelo | Thymelaeaceae
|
| WIHA | Wikstroemia haleakalensis Skottsberg | Wikstroemia oahuensis var. oahuensis | Thymelaeaceae
|
| WIHA2 | Wikstroemia hanalei Wawra | lavafield false ohelo | Thymelaeaceae
|
| WIIS | Wikstroemia isae Skottsberg | Wikstroemia oahuensis var. oahuensis | Thymelaeaceae
|
| WILAA | Wikstroemia lanaiensis Skottsberg var. acutifolia Skottsberg | Wikstroemia oahuensis var. oahuensis | Thymelaeaceae
|
| WILA | Wikstroemia lanaiensis Skottsberg | Wikstroemia oahuensis var. oahuensis | Thymelaeaceae
|
| WILE | Wikstroemia leptantha Skottsberg | Wikstroemia oahuensis var. oahuensis | Thymelaeaceae
|
| WIMA2 | Wikstroemia macrosiphon Skottsberg | Wikstroemia oahuensis var. oahuensis | Thymelaeaceae
|
| WIMOO | Wikstroemia monticola Skottsberg var. occidentalis Skottsberg | Wikstroemia uva-ursi var. uva-ursi | Thymelaeaceae
|
| WIMO | Wikstroemia monticola Skottsberg | montane false ohelo | Thymelaeaceae
|
| WIOAO | Wikstroemia oahuensis (Gray) Rock var. oahuensis | Oahu false ohelo | Thymelaeaceae
|
| WIOAP | Wikstroemia oahuensis (Gray) Rock var. palustris (Hochr.) Peterson | Oahu false ohelo | Thymelaeaceae
|
| WIOA | Wikstroemia oahuensis (Gray) Rock | Oahu false ohelo | Thymelaeaceae
|
| WIPAM | Wikstroemia palustris Hochr. var. major Skottsberg | Wikstroemia oahuensis var. oahuensis | Thymelaeaceae
|
| WIPA | Wikstroemia palustris Hochr. | Wikstroemia oahuensis var. palustris | Thymelaeaceae
|
| WIPE2 | Wikstroemia perdita O.& I. Deg. | Wikstroemia sandwicensis | Thymelaeaceae
|
| WIPHB | Wikstroemia phillyreifolia Gray var. buxifolia (Gray) Skottsberg | Wikstroemia pulcherrima | Thymelaeaceae
|
| WIPHR | Wikstroemia phillyreifolia Gray var. rigida Gray | Wikstroemia phillyreifolia | Thymelaeaceae
|
| WIPH2 | Wikstroemia phillyreifolia Gray | Hawai'i false ohelo | Thymelaeaceae
|
| WIPU | Wikstroemia pulcherrima Skottsberg | Kohala false ohelo | Thymelaeaceae
|
| WIREN | Wikstroemia recurva (Hbd.) Skottsberg var. neriifolia Skottsberg | Wikstroemia oahuensis var. oahuensis | Thymelaeaceae
|
| WIRE2 | Wikstroemia recurva (Hbd.) Skottsberg | Wikstroemia oahuensis var. oahuensis | Thymelaeaceae
|
| WISA | Wikstroemia sandwicensis Meisn. | variableleaf false ohelo | Thymelaeaceae
|
| WISE | Wikstroemia sellingii Skottsberg | Wikstroemia oahuensis var. oahuensis | Thymelaeaceae
|
| WISK | Wikstroemia skottsbergiana Sparre | Skottsberg's false ohelo | Thymelaeaceae
|
| WIUVK | Wikstroemia uva-ursi Gray var. kauaiensis Skottsberg | Kauai false ohelo | Thymelaeaceae
|
| WIUVU | Wikstroemia uva-ursi Gray var. uva-ursi | hillside false ohelo | Thymelaeaceae
|
| WIUV | Wikstroemia uva-ursi Gray | hillside false ohelo | Thymelaeaceae
|
| WIVA | Wikstroemia vacciniifolia Skottsberg | Wikstroemia oahuensis var. oahuensis | Thymelaeaceae
|
| WIVI | Wikstroemia villosa Hbd. | hairy false ohelo | Thymelaeaceae
|
| WIKST | Wikstroemia Endl. | false ohelo | Thymelaeaceae
|
| WIDI3 | Wilcoxia diguetii (A. Weber) Peebles | Peniocereus striatus | Cactaceae
|
| WIPO | Wilcoxia poselgeri (Lem.) Britt. & Rose | Echinocereus poselgeri | Cactaceae
|
| WIST | Wilcoxia striata (Brandeg.) Britt. & Rose | Peniocereus striatus | Cactaceae
|
| WIPH | Wilhelmsia physodes (Fisch. ex Ser.) McNeill | merckia | Caryophyllaceae
|
| WILHE | Wilhelmsia Reichenb. | wilhelmsia | Caryophyllaceae
|
| WIGR | Wilkesia grayana Hbd. | Argyroxiphium grayanum | Asteraceae
|
| WIGY | Wilkesia gymnoxiphium Gray | iliau | Asteraceae
|
| WIHO3 | Wilkesia hobdyi St. John | dwarf iliau | Asteraceae
|
| WILKE | Wilkesia Gray | iliau | Asteraceae
|
| WITE | Willkommia texana A.S. Hitchc. | Texas willkommia | Poaceae
|
| WILLK | Willkommia Hack. | willkommia | Poaceae
|
| WIHA3 | Willoughbya halei Small | Mikania cordifolia | Asteraceae
|
| WICA3 | Wislizenia californica Greene | Wislizenia refracta ssp. californica | Capparaceae
|
| WIDI2 | Wislizenia divaricata Greene | Wislizenia refracta ssp. palmeri | Capparaceae
|
| WIREC | Wislizenia refracta Engelm. ssp. californica (Greene) Keller | spectacle fruit | Capparaceae
|
| WIREP | Wislizenia refracta Engelm. ssp. palmeri (Gray) Keller | Palmer's wislizenia | Capparaceae
|
| WIRER | Wislizenia refracta Engelm. ssp. refracta | spectacle fruit | Capparaceae
|
| WIREM | Wislizenia refracta Engelm. var. melilotoides (Greene) I.M. Johnston | Wislizenia refracta ssp. refracta | Capparaceae
|