INDEX 



68 3 



Vitis vulpina, 439 



Waldsteinia, 371 



fragarioides, 371 

 Washingtonia, 477 



Claytoni, 477 



longistylis, 477 

 Wilhighbaea, 594 

 Wolffia, 215 



Columbiana, 27, 215 



punctata, 215 

 Woodsia, 52 



ilvensis, 52 



obtusa, 52 



Xanthium, 587 



americanum, 588 

 commune, 588 

 echinatum, 588 

 glabratum, 588 

 pennsylvanicum, 588 

 speciosum, 588 



Xanthium spinosum, 588 

 Xanthorrhiza apiifolia, 330 

 Xanthoxalis, 416 



Brittoniae, 417 



Bushii, 417 



corniculata, 417 



cymosa, 417 



filipes, 16, 417 



rufa, 417 



stricta, 416 

 Xerophyllum, 229 



asphodeloides, 15, 18, 

 229 

 Xolisma, 491 



Iigustrina, 491 

 Xyridaceae, 216 

 Xyris, 216 



arenicola, 15, 217 



caroliniana, 216 



Congdoni, 4, 29, 217 



elata, 15, 216 



fimbriata, 15, 217 



Xyris flexuosa, 216 



montana, 6, 19, 216 



Yucca filamentosa, 235 



Zannichellia, 78 



palustris, 78 

 Zannichelliaceae, 78 

 Zanthoxylum, 419 



americanum, 419 

 Zizania, 119 



aquatica, 119 

 Zizia, 478 



aurea, 24, 478 



cordata, 478 

 Zostera, 85 



marina, 85 

 Zosteraceae, 85 

 Zygadenus leimantlwides, 230 

 Zygophyllaceae, 419 

 Zygophyllum Fabago, 419 



