INDEX 



517 



VVarming, 245 

 Welwitschw, embryo, 313 



gametophytes, 301 



vessels, 1, 45 

 Wintera, perianth, 88 

 Winteraceae, androecium, 96, 385, 386, 

 432 



carpel, 188, 195, 385 



chromosome number, 429, 431 



corolla, 425 



ethereal oil cells, 430 



gynoecium, 386 



inflorescence, 387, 389 



Lactoridaceae, relation to, 388 



leaves, 12, 386 



microsporangia, position, 394 



ovule, 270 



placentation, 208, 442 



pollen, 159, 161, 385, 428, 429 



pollen tubes, 178, 386, 387, 426 



pollination, 170 



primitiveness, 432 



receptacle, 429 



relationships, 422, 430 



stigmatic crest, 178, 188, 196, 386 



xylem, 43, 47, 49, 52, 53, 386, 423 

 Wisnerm, perianth, 438 

 Wolffiu, size, 2 



stamen, solitary, 104 

 Wood, Casimrina, 436, 437 



dillenialian, 433, 434 



early and late summer, 46 



mature, 46 



ranalian, 391, 393, 399, 402, 403, 405, 

 407, 408, 410, 411, 414, 431 



vesselless, 435 



{See also Vessel; Xylem) 

 Wood fibers {see Fibers) 

 Wood parenchyma, 43, 50, 51 

 Wood rays, 43, 46, 47, 51, 52, 53, 466 

 Woody plants, cambium, 59 

 Wormia, flower, 98 



Xanthium, anemophily, 173 



pollen, 163 

 XanthorrJwea, inflorescence, 68, 69 

 Xanthosia, inflorescence, 72 

 Xeropetaliim, cotyledons, 344 

 Xerophily, anther dehiscence, 378 



reduced leaves, 10 



small flowers, 83 

 Xylem, 43-55 



diff^use-porous, 45 



dillenialian, 434 



evolution, 43 



fibers, 43 



growth, gliding and intrusive, 60 



Xylem, pitting, bordered, 43 



primitive, 49 



round, 49 



scalariform, 43, 44, 49 

 ranahan, 404, 414, 415, 420, 421, 423, 



431 

 rayless, 54 

 ring-porous, 45 

 secondary, 46 

 tracheids, 43 



types, characteristic of taxa, 55 

 vessel elements, 43, 44 



distribution, 45 



perforation, 45 

 vesselless, 47, 48, 431 

 wood parenchyma, 43 

 wood rays, 43, 46, 51, 52, 53 

 {See also Vessel; Wood) 

 Xylem rays, aggregate, 51 

 definition, 51 

 evolution, 54, 55 

 multiseriate, 51, 52, 53, 55 

 primary, 51 

 specialization, 55 

 storied, 54 



uniseriate, 51, 52, 53, 55 

 {See also Wood rays) 



Yucca, radicle, 326 

 style, 203 



Zalacca, flowers, 447 



lorica, 446 

 Zannichcllia, anther wall, 136, 141 



carpel, 186 



stamen, pseudoterminal, 104 



stipules, 16 

 Zea, coleoptile, 337, 340 



cotyledon, 348 



embryo, 336, 340, 353, 355 



integuments in fruit, 379 



ovule, 371 



pollen germination, 177 



pollination to fertilization time, 310 



seedling anatomy, 348 



transmitting tissue, 200, 202 

 Zingiberaceae, anther, 105 



embryo, 336, 350 



endosperm, 375 



perisperm, 375 



stamen, 105 

 Zizania, embryo, 333 



epiblast, 345 



mesocoty], 341 

 Zoster a, anther wall, 136, 141 



embryo, 358 



hydrophily, 172 



