912 



INDEX 



Seed 485, f. 1,85 

 sp. Distribution 704 



Seed 829, 861 

 spinosum 335, f. 330 



Distribution 608, 713, 737, 754 

 Seed 4 85, f. 1,85 

 strumarium 486 

 Xylem 872 



Xylopleurum tetrapterum, Distribution 

 696 



Yard Grass syn. Crowfoot Grass 



Yarrow 358-360, 778, 787, f. 359. ?Ji 

 Chemical composition 673, 674 

 Distribution 698, 704, 708, 720, 736, 



TO. 359 

 Seed 491, f. .',91 

 Yellow Clover 183-184, 450, 451 

 Dock syn. Curled Dock 

 Foxglove, Wild 702 

 Foxtail 17-20, 413, 511-512, 616, 657, 

 658, 659, 660, 676, 691, 714, 789 

 Oxalis 199, 645 



Rattle 667, 742 

 Rocket sim. Winter Cress 

 Sorrel, Field si/n. Field Sorrel 

 Spurge syn. Cypress Sptirge 

 Sweet Clover 186-187, 452, 548, 713 

 718, 725, 729, 759, 776, 810, 811 

 Trefoil 453, 638, 640, 787, 810, 811, 

 815, 831 



Yellow-flowered Goldenrod 316-317 

 480, 689, 738, 790 



Yellowstone Park, Weeds of 757 



Yorkshire Fog 665, 667 



Yorkshire Weeds 825, 845 



Young, F. B. 855 



Yucatan Flora 731 



Zapparoli, T. V. 829, 858 

 Zeeuw, R. 831 

 Zea mavs f. 505 



Seed 813 

 Zinger, N. 853 



Zinnia pauciflora, Distribution 696, 698 

 Zurich Seed Control Station 828 

 Ztgophyllaceae 4, 203-204 



