Woundwort, Marsh, 357 
Soldier’s, 486 
Xanthium canadense, 461 
spinosum, 460 
Xanthoxalis corniculata, 256 
stricta, 255 
Ximenesia encelioides, 470 
Xylorhiza Parryi, 439 
INDEX 
Yarrow, 486 
Sneezewort, 489 
Yellow-seed, 178 
Yellow Star, 481 
Yellowweed, Creeping, 426 
Tall, 425 
Yerba Mansa, 85 
Zygadenus venenosus, 76 
Printed in the United States of America. 
593 ~ 
