INDEX 



183 



Tradescantia, 139 ; canalicnlata, 141 ; hir- 

 suti flora, 142; occidentalis, 141 ; 03arkana, 

 142 



Trichoccreus spachiamts, 21, 24 



Ulmus americana, 83 ; campestris, 83 



Uredo, 66 



Uromyces, 66 



Urtica cannabina, 11 



Ustilago hordei, 77, 160; tritici, 160; tw- 



/ac£'a, 160; sca^-, 160 

 Utricularia cJeistogama, 171 ; cormita, 173 ; 



fibrosa, 173; gibba, 170; macrorrhisa, 173 



Vaccinhmi arkansanum, 134; australe, 134; 



corymbosii'm, 134; simulatiim, 134 

 Vascular plants, Leaf-stem relationships in, 



16 

 Vinca rosea, 92 

 Fio/a Brittoniana, 170 

 Viruses in relation to the growth of plants, 



87 

 Vitamins, Plants need for, 116 

 FiVw, 11 



Wetmore, R. H., 2 ; Leaf-stem relationships 

 in the vascular plants, 16 



Whaley, W. G. : Inferiority complexes in 

 plants, lecture, 82 



WiNOKUR, Morris : Photosynthesis in bac- 

 teria, lecture, 80 



WiTTROCK, G. L. : Local plants used by the 

 American Indians, lecture, 79 



Woods, How identified, lecture, 84 



Wynne, Frances E. : Variability and dis- 

 tribution of Drepanocladus in North 

 America, lecture, 80 



X-rays and colchicine. The combined ef- 

 fects of, on onion root tips, lecture, 176 



Yeast plants, treated as individuals, lecture, 

 79 



Zea mays, 69 



Zimmerman, P. W. 3; The formative in- 

 fluences and comparative efifectiveness of 

 various plant hormone-like compounds, 

 98 



