Index 



491 



w 



W'ashingtonia longistylis. . . .270, 372, ,174 



VVeigelia 155 



Wolf fia : 286 



— Columbiana Karst 471 



punctata Griseb 471 



Woodsia glabella R. Br 465 



oregana D. C. Eaton 465 



scopulina D. C. Eaton 465 



X 



Xaiithiuin caiiadense Mill 405 



commune Britton 398 



Xantboxylum americanum. .265, 267, 



368, 373 



Xyloina accrinum Pers 117 



andromedae Pers 117 



-punctatum Pers 118 



salicinum Pers 116 



Xyris montana Ries 471 



Y 



Yucca 236 



aloifolia L 431 



angustifolia 427 



Draconis Torr 431 



filamentosa L 430, 431, 432 



-guatemalensis L 431 



glauca 221, 229, 230, 233, 



235, 427—435 



z 



Zannichellia 281 



palustris 281, 338 



Zea niais 51 



Zizania. .285, 336, 339, 340, 354, 364, 365 



aquatica 282, 283, 338 



Zizia aurea 372 



Zygodesmus 98 



