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Viola tricolor (johnny jump-up) 149 -- variously colored; stem lvs

Vitaceae (grape) -- Ampelopsis (porcelain berry); Parthenocissus (virginia creeper), Vitis (grape)

Vitis aestivalis (summer grape) Vitaceae (5 5 5 1 perf or unisex; hypo) 324 -- lfs wh under; tendrils not prduce at more than 2 successive nodes

Vitis labrusca (fox grape) Vitaceae (5 5 5 1 perf or unisex; hypo) 324 -- lf: white under

Vitis novae-angliae (New England grape) Vitaceae (5 5 5 1 perf or unisex; hypo) 325 -- lf white under

Vitis riparia (riverbank grape) Vitaceae (5 5 5 1 perf or unisex; hypo) 325 -- lfs grn under & sharply 3-lobed; fr bluish-black

Vitis vulpina (frost grape) Vitaceae (5 5 5 1 perf or unisex; hypo) 325 -- lfs grn under & lvs unlobed or sl 3-lobed; fr black & shining

Vulpia bromoides (fescue grass) Poaceae 697 -- very long, hairy awns; spikelets on 1 side; long tear drops make up infl; elongated segement; to 6-7 dm

Vulpia elliotea (squirrel-tail fescue grass) Poaceae 697 -- long, smooth awns; 1-sided on long pedicels; infl of long tear drops; elongated segement; to 6-7 dm

Vulpia myuros (rat-tail fescue grass) Poaceae 697 -- curved, hairy, long awns; first glume up to half as long as the second; widespread weed; rope-like infl

Vulpia octoflora (six-weeks fescue grass) Poaceae 697 -- small, hairy awns; 1-6dm tall; dry or sterile soil

Waldsteinia fragarioides (barren strawberry) Rosaceae (5 5 N 2-6) 221 -- sepals pointed and equal in length to yellow pets; BDT trif

Wisteria floribunda (Japanese wisteria) 261 -- lflts 13-19, ovate-elliptical; racemes to 18" long, violet to violet blue, pink, red or white; fr velvety to 6"

Wisteria frutescens (wisteria) 261 -- lflts 9-15, ovate to oblong-lanceolate; racemes to 2-5" long, lilac-purple; fr glabrous to 4"

Wisteria japonica -- lflts 9-13 ovate-lanceolate to 2.25"; racemes to 12" long, fls greenish-white; fr glabrous

Wisteria macrostachya (Mississippi wisteria) 262 -- lflts us. 9, ovate; racemes 12" long, lilac-purple or light blue; fr glabrous to 4.5"

Wisteria sinensis (Chinese wisteria) -- lflts us. 11, ovate to ovate-lanceolate to 3"; racemes to 12", bluish-violet; fls appear before lvs; fr velvety to 6"

Wisteria sp. (Wisteria) Fabaceae (5 5 10 1 perf or unisex; peri) 261-262 --

Wolffia columbiana Lemnaceae (0 0 1 0/0 0 0 1) 616 --

Wolffia papulifera Lemnaceae (0 0 1 0/0 0 0 1) 616 --

Wolffia punctata Lemnaceae (0 0 1 0/0 0 0 1) 616 --

Wolffiella floridana Lemnaceae (0 0 1 0/0 0 0 1) 616 --

Woodsia glabella (smooth cliff fern) Aspleniaceae 020 --

Woodsia obtusa (blunt-lobed cliff fern) Aspleniaceae 021 --

Woodwardia areolata (netted chain fern) Blechnaceae 030 -- glossy green; lvs to 15" long

Woodwardia virginica (Virginia chain fern) Blechnaceae 030 -- leaflets point upward at 45 degree angle; lvs to 24" long

Xanthium spinosum (spiny clotbur) Asteraceae/Heliantheae 516 -- lvs smaller

Xanthium strumarium (common clotbur) Asteraceae/Heliantheae 516 -- lvs large & tri-lobed

Xanthorhiza simplicissima (yellow root) Ranunculaceae (0 5 5-10 1) 061 --

Xerophyllum asphodeloides (turkey beard) Liliaceae (3 3 6 3) 780

Xyris difformis (yellow eyed grass) 618 -- small spike; keel of lateral sep lacerate

Xyris fimbriata (yellow eyed grass) 618 -- medium spike; keel of lateral sep hairy; BE to 7 cm

Xyris jupicai (yellow eyed grass) 617 -- small spike; lacerate

Xyris montana (mountain yellow eyed grass) 617 -- small spike; enitre or ciliate; BE to 15 cm; bogs

Xyris smalliana (Small's yellow eyed grass) 617 -- larger spikes; lacerate

Xyris sp. (yellow eyed grass) Xyridaceae (3 3 3 3 hypo) --

Xyris torta (slender yellow eyed grass) 618 -- medium spike; BE very narrow, oft spirally twisted; plant base enlarged Y

Yucca filamentosa (Adam's needle) Agavaceae (3 3 6 3 sup) 804

Zannichellia palustris (horned pondweed) Zannichelliaceae (0 0 1 0/0 0 0 4or 5 unisex) 614 --

Zanthoxylum americanum (common prickly ash) Rutaceae (4-5 4-5 4-5 2-5 uni hypo) 336 -- lflts OE

Zigadenus elegans (death camas) Liliaceae (3 3 6 3) 783 --

Zigadenus leimanthoides (death camas) Liliaceae (3 3 6 3) 783 --

Zinnia elegans Asteraceae/Heliantheae 502 --

Zizania aquatica (wild rice) Poaceae 691

Zizania palustris Poaceae 691 --

Zizaniopsis miliacea (southern wild rice grass) Poaceae 691 --

Zizia aptera (heart-leaved alexanders) Apiaceae (5 5 5 2) 353 -- basal lvs heart-shaped

Zizia aurea (golden alexanders) Apiaceae (5 5 5 2) 353 -- lvs 2-3 times divided

Zostera marina (eel-grass) Zosteraceae (0 0 1 0/0 0 0 1) 614 --

Zosterella dubia (water stargrass) Pontederiaceae (6 t 3 3) 779 -- pale yellow; AE grass-like