INDEX OF GENERA AND SPECIES. 



535 



Wcllingionia qiganica, Lindl., 



ii. 117. 



Welwitschia, Hook, f., ii. 108. 

 "Western Chinquapin, ii. 99. 



Larch, ii. 112. 



Mountain Ash, i. 189. 

 Wheat, ii. 323. 

 Whipplea, Ton-., i. 203. 



modesta, Torr., i. 203, ii. 

 446. 



Utahensis, Watson, i. 203. 

 White Bent-Grass, ii. 272. 



Cedar, ii. 115. 



Clover, i. 129. 



Daisy, i. 401. 



Fir, ii. 118. 



Oak, ii. 95, 96. 



Mustard, i. 39. 



Sage, ii. 56, 477. 



Sapota, ii. 438. 



Top, ii. 272. 

 White-weed, i. 401. 

 Whitlavia, Harvey, i. 513. 



(jrandiflora, Harvey, i. 513. 



minor, Harvey, i. 514. 

 Whitneya, Gray, i. 374. 



dealbata, Gray, i. 374. 

 Wiyandia Californica, Hook., 



i. 518. 

 Wild Buckwheat, ii. 481. 



Cabbage, i. 36. 



Cherry, i. 167. 



Ginger, ii. 101. 



Mock Cherry, i. 167. 



Pieplant, ii. 479. 



Plum, i. 167. 



Radish, i. 49. 

 Wild-Oat Grass, ii. 294. 

 Willow, ii. 82. 



Velvet, ii. 88. 

 Willow-herb, i. 218. 

 Winter Cress, i. 40. 



Fat, ii. 56. 



Wintergreen, i. 454, 460. 

 Wislizenia, Engelni., i. 52. 



Palmeri, Gray, i. 52. 



refracta, Engelm., i. 52. 

 Witlmnia Coronojms, Torr., i. 



540. 

 Wood Anemone, i. 4. 



Wood Fern, ii. 345. 



Reed-Grass, ii. 276. 



Rush, ii. 203. 



Sorrel, i. 96. 

 Woodbine, i. 280. 

 Woodsia, R. Br., ii. 348. 1 ; 



Oregana, Eaton, ii. 348. 



scopnlina, Eaton, ii. 348. 

 Wood vil lea calcndulacca, DC., 



i. 331. 

 Woodwardia, Smith, ii. 343. 



Chamissoi, Brack., ii. 344. 



radicans, Smith, ii. 344. 

 Wormseed, ii. 47. 

 Wormwood, i. 402. 

 Wrack, Grass, ii. 191. 

 Wulfenia reniformis, Bcnth., 



i. 571. 

 Wyethia, Nutt., i. 348. 



amplexicaulis, Nutt., i. 350, 

 ii. 456. 



angusti folia, Nutt., i. 350. 



coriacea, Gray, i. 616. 



glabra, Gray, i. 349. 



hclenioides, Nutt., i. 349. 



helianthoides, Nutt., i. 350. 



mollis, Gray, i. 349. 



ovata, Gray, i. 349. 



robusia, Nutt., i. 350. 



Xanthtum, Tourn., i. 346. 



spinosum, Linn., i. 346. 



strumarium, Linn., i. 346. 

 Xcrobolrys, Nutt., i. 452. 



aryutus, Nutt., i. 453. 



cordifoliiis, Nutt., i. 453. 



lomentosiis, Nutt., i. 453. 



vcnulosus, Nutt., i. 453. 

 Xerophyllum, Michx., ii. 185. 



Douglasii, Watson, ii. 186. 



sctifolium, ii. 185. 



tenax, Nutt., ii. 185. 

 Ximeuesia encelioides, Cav., i. 



350. 

 Xylococcus, Nutt., i. 452. 



bicolor, Nutt., i. 454. 



Yarrow, i. 400. 

 Yeara, i. 110. 

 Yellow Pine, ii. 126. 



Yellow Pond-Lily, i. 17. 

 Yerba Buena, i. 595. 



de la Bibora, ii. 452. 



del Oso, ii. 439. 



Mansa, ii. 77. 



Reuma, ii. 433. 



Santa, ii. 468. 

 Yew, ii. 110. 

 Yucca, Linn., ii. 163. 



aloifolia, Torr., ii. 164. 



baccata, Torr., ii. 164. 



brevifolia, Engelm., ii. 104. 



Draconis, ii. 164. 



filaincntosa, ii. 164. 



gramini folia, Wood, ii. 165. 



Whipplei, Torr., ii. 164. 



Zacate de liebre, ii. 289. 

 Zaimichellia, Micheli, ii. 193. 



major, Boenn., ii. 193. 



palustris, Linn., ii. 193. 

 Zapaiiianodiflora, Lam., i. 610. 

 Zapote bianco, ii. 438. 

 Zauschneria, Presl, i. 217. 



Californica, Presl, i. 218. 



Mcxicana, Presl, i. 218. 

 Zizyphus, Juss., i. 99. 



Parryi, Torr., i. 99. 

 Zostera, Linn., ii. 191. 



angustif'olia, Reichenb., ii. 

 192. 



marina, Linn., ii. 192. 

 Zygadene, ii. 183. 

 Zygadenus, Michx., ii. 183. 



cklornnthus, ii. 183. 



Douglasii, Torr., ii. 183. 



elegans, Pursh, ii. 183. 



Fremonti, Torr., ii. 183. 



glaberrimm, ii. 183. 



glaucus, Nutt., ii. 183. 



Nuttallii, Gray, ii. 184. 



Nuttallii, ii. 183. 



paniculatus, Watson, ii. 184. 



venenosus, Watson, ii. 183. 

 Zygodon, Hook. & Tayl., ii. 

 376. 



Californicus, Hampe, ii. 376. 



Lapponicns, Bruch&Schimp., 



ii. 376. 

 ZYGOPHYLLACE.E, i. 91. 



