INDEX 



679 



Topinambour, 639 

 Top onions, 241, 242 

 Torch-wood, 475 

 Torus, 49 



Toxylon pomiferum, 252 

 Tracheal tubes, 36 

 Tracheids, 36 

 Tragopogon, 628 



porrifolius, 633 



pratensis, 635 

 Trailing arbutus, 543 

 Transpiration stream, 47 

 Tree, 2 



onions, 241, 242 



tomato, 592 

 Trifoliate orange, 489 

 Trifolium, 66, 432 



alexandrinum, 433 



hybridum, 433, 434 



incarnatum, 433, 435 



key to principal species of, 433 



medium, 433, 441 



pratense, 433, 436 

 perenne, 439 



repens, 433 



suaveolens, 433 

 Trigonella foenum-grcecum, 467 

 Tripping, of alfalfa flowers, 444 

 Triticum, 88, 91 



cegilopoides, 112, 116 



aestivum, in, 112, 114, 116 



boeoticum, 112 



capitatum, n6 



compactum, in, 112, 114, 116 



dicoccum, in, 112, 113, 116 

 dicoccoides, 114, 115, 116 



durum, in, 112, 113, 116 



hermonis, 114 



monococcum, no, in, 112 



ovata, no 



polonicum, in, 112, 113, 116 



spella, III, 112, 113, 116 



thaoudar, 112 



Triticum, turgidum, in, 113, 116 



Tube nucleus, 50 



Tuberization, fungus theory of, 569 



Tubers, 30, 31 



Tubuliflorse, 627 



Tulip, 229 



Turban squash, 614 



Turkestan alfalfa, 447 



Turnip, 65, 335 



common, 335 



Swede, 337 

 Turnip-rooted celery, 540 

 Twin oats, 126 

 Two-rowed barley, 145 



Umbel, 56, 234, 530 

 Umbelliferae, 530 



key to genera of economic impor- 

 tance, 533 

 Unshiu orange, 485 

 Upland cotton, 510, 520 

 Upright tomato, 587, 590 

 Utricle, 297 



Vaccinium, 543, 545 



angustifolium, 546, 550 



arboreum, 543 



atrococcum, 547, 550 



caespitosum, 546 



canadense, 66, 546, 550 



corymbosum, 547, 550 



key to chief fruit-bearing species of, 

 546 



macrocarpon, 546, 548 



membranaceum, 544 



myrtillus, 546 



nigrum, 546, 550 



ovalifolium, 547 



oxycoccus, 546, 549 



'vacillans, 546, 550 



virgatum, 544 



vitis-idaea, 546, 550 

 Vacciniaceae, 543 



