Violet placentation, 157. 
pollination, 163. 
runner, 101. 
Virginia creeper, 99. 
Voleanie soil, 78. 
Wahlenbergia, 165. 
Wallflower, 225. 
Walnut fruit, 182. 
Wandering Jew, 84. 
‘Warmth for fermentation, 389. 
“Water 
adhering, 137. 
conservation, 133, 136. 
cress, 125, 196, 229. 
cultures, 84-6. 
estimation of, 77. 
factor, 194. 
for germination, 43. 
hyacinth, 196, 197. 
in soil, 81. 
milfoils, 195, 196. 
plants, adaptations, 195-6. 
pollination, 173. 
seed-dispersal by, 186. 
star-worts, 195, 196. 
Water-lily ; 
flower, 150. 
leaf, 195. 
seed-dispersal, 186. 
‘Weinmannia, 176. 
INDEX 269 
Wharangi, 182. 
Whau, 140, 141, 142, 
Wheat, 255. 
Whipcord veronica, 199. 
White-peard, 199. 
Whorled, 114. 
Wild Irishman, 134, 198, 199. 
Willow, habit, 94. 
leaves, 114, 138. 
roots, 60. 
seed dispersal, 185. 
Wistaria leaf, 142. 
Wind-still tube, 136. 
pollination, 165, 
protection against, 187. 
seed-dispersal by, 185. 
Wineberry, 209, 2138. 
Wings, 21. 
Wood of root, 68; of stem, 90. 
Woolly hairs, 136. 
Xerophytes, 133, 194, 198, 201. 
adaptations of, 198. 
Xerophytic hydrophytes, 201. 
Yucca, 252. 
pollination, 170. 
Zygomorphic, 153. 
