INDEX OF PLANT NAMES 



fruit, 402 ; 



515 



Xanthium, 59-60 ; 

 seed, 42s 



Yew, specific conductivity, 188 ; 

 aril, 400 ; seed dispersal, 411 

 Yucca filamentosa, 370 



Zamia, 341 



Zannichellia, 342, 379 



Zostera, toxic effect of salts, 64, 

 294 ; pollen, 345 ; pol- 

 lination, 379 



marina, 294 



