912 



INDEX 



Seed 485, f. iSS 

 sp. Distribution 704 



Seed 829, 861 

 spinosum 335, f. SS6 



Distribution 698, 713, 737, 754 

 Seed 485, f. J,8S 

 strumarium 486 

 Xylem 872 



Xylopleurum tetrapterura. Distribution 

 696 



Yard Grass syn. Crowfoot Orass 

 Yarrow 358-360, 778, 787, f. S59, 1U 

 Chemical composition 673, 674 

 Distribution 69"8, 704, 708, 720. 736, 



m. S59 

 Seed 491, f. m 

 Yellow Clover 183-184, 450, 451 

 Doch syn. Curled Dock 

 Foxglove, Wild 702 

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

 658, 669, 660, 676, 691, 714, 789 

 Oxalis 199, 645 



Rattle 667, 742 



Rocket syn. Winter Cress 



Sorrel, Field syn. Field Sorrel 



Spurge syn. Cypress Spurge 



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 mays f. 505 



Seed 813 

 Zinger, N. 853 



Zinnia pauciflora. Distribution 696, 698 

 Zttrich Seed Control Station 828 

 Ztgophtllaceae 4, 203-204 



