800 



INDEX 



Collenchyma, 72, 281 



Colloids, 61 



Color, 27; leaf, 28; spectrum, 27, 115 



Communities, plant. 40-49 



Companion cells, 282, 283 



Compass plant, 81 



Compensation point, 164 



Compositae, 717 



Conceptacle, 633 



Concord grape, 400, 434 



Condensation, 99. 129, 138, 143, 168 



Conidia, 548, 550. 551 



Conidiophore, 548 



Conifers, 682-687 



Conjugation. 667, 620, 622; tu!)e, 620 



Conservation. 185. 405, 406, 793 



Convolvuhiccae. 714 



C:opper, 330; sulfate, 578, 609 



Copy inns, 4 



Cordaites. 730 



Cordillcran center, 734 



Cork, 280, 281 



Corms, 257, 258. 358. 410 



Corn, energy transformations in, 184; 



flowers, 359; harvesting liy Indians, 



423, 427; hybrids. 470-472; plant, 177 

 Corolla, 354 

 Correns, 435 



Cortex, 13, 223. 264. 266, 280, 281, 303 

 Corymb. 360, 361 

 Cosmos, human, 182 

 Cotyledons, 10, 11, 13, 294, 296, 367 

 Creosote bush, 768 

 Cretaceous flora, 731 

 Cross-fertilization, 382, 442, 458-473 

 Crossing-over, 481 

 Crowfoot family, 706 

 Crown of trees, 41 

 Cruciferae, 706 

 Cucurbitaceae, 717 

 Culture media, 518; solutions, 193, 328, 



331; tank, 331, 332 

 Cup fungi, 553 

 Cuticle, 71 



Cutin, 65, 71, 168, 169 

 Cuttings, 191, 400, 414; leaf, 421, 422; 



root, 420; stem, 414 

 Cycads, 681, 688, 790 

 Cylinder, vascular, 264 

 Cyperaceae, 697 



Cypress, 678; bald, 761; "knees," 310, 



762; Monterey, 780 

 Cystine, 144 

 Cystocarp, 637 

 Cytoplasm, 59, 60, 63 



Damping-ott, 577 



Darkness, growth in, 53, 54 (see also 

 Light) 



Darwin, Charles, 487, 500 



Day-neutral plants, 344 



de Bary, 567 



Deciduous habits, 32 



Dehiscence, 372 



Denitrification, 534, 538 



Desert, 770; plants, 771, 772, 773; shrub- 

 land, 741, 768, 771 



Desiccation, 101 



Desmids. 622 



Desulfofication, 539 



Devonian floras, 727 



de Vries, 435, 488 



Dew, 321 



Dextrin, 133 



Dextrinase, 133 



Diastase, 129, 175 



Diatomaceous earth. 625 



Diatoms, 97, 602, 608, (i25. 626, 636 



Dicots, 368 



Differentiation (see Cells and Tissues) 



Diffusion, 198 



Digestion, 99, 129. 139, 170 



Dinoflagellates. 608 



Dinophyceae. 608 



Dioecious. 360 



Diploid, 451, 636 



Disaccharides, 134, 135 



Diseases of plants, 2. 567. 572. 584; and 

 environment, 570. 571; control of, 

 575-585; "deficiency," 575; economics, 

 569; nature of, 568; symptoms of, 573; 

 virulence of, 572 



Dissemination, pollen. 383: seed, 368 



Distribution, plant. 165. 591 (see also 

 Vegetation of North America; Plants 

 of the past) 



Dodder, 298, 301, 505 



Domestication, 423 et seq. 



Dominance, 456, 459 



Dormancy, 32, 34, 259, 397 



Douglas fir. 777, 783 



