INDEX. 
447 
White Hellebore, 76 
White Hoarhound, 296 
White Mustard, 160 
White Sage, 118 
White Spruce, 8 
White Water-crowfoot, 142 
Whitlow-grass, 161 
Whitlow-wort, 121 
Whitlow-wort Family, 121 
Whorl-grass, Water, 39 
Wild Bergamot, 298 
Wild Crab-grass, 36 
Wild Liquorice, 213 
Wild Morning-glory, 273 
Wild Mustard, 160 
Wild Oat-grass, 35 
Wild Oats, 23 
Wild Rye, 56 
Wild Sarsaparilla, 249 
Wild Spikenard, 84 
Willow, 92 
Willow Family, 91 
Willow-herb, 241 
Wind-flower, 140 
Winter-cress, 160 
Wintergreen, 259 
Wintergreen, Creeping, 259 
Wintergreen, one-flowered, 258 
Wintergreen Family, 258 
Winter Sage, 118 
Wire Grass, 23, 29 
Witch-grass, 21 
Wood-Fern, 2 
Wood Reed-grass, 30 
Wood-rush, 80 
Woodsia, 2 
Wood-sorrel, Violet, 220 
Wood-sorrel, Yellow, 220 
Wood-sorrel Family, 220 
Wormwood, 382 
Wulfenia, 313 
Wyethia, 372 
Xanthium, 329 
Xanthoxalis, 220 
Ximenesia, 374 
Xylophacos, 206 
Xylorrhiza, 351 
Xyridales, 75 
Yard-grass ( Polygonum ) 
Yarrow, 382 
Yellow-rattle, 319 
Yellow Water-lily, 147 
Yellow Wood-sorrel, 220 
Yucca, 85 
Yucca, 85 
Yucca Family, 85 
Zanichellia, 13 
Zanichelliace^e, 12 
Zinnia, 371 
Zizia, 2 52 
Zoysie^e, 20 
Zygadenus, 76, 77 
Zygophyllace^e, 220 
Zygophyllidium, 224 
