INDEX 



507 



Polar nuclei, 293, 294, 295, 304, 315, 

 316 



Polemoniurn, proembryo type, 311 

 Pollen, anemophilous, 174 



antheridium homologous with, 181 



arrangement in tetrad, 158, 161 



Casuarina, 437 



compound, 144 



definition, 146, 158 



development, 163, 164, 166 



sequence within sporangium, 164 

 types, 163 



dillenialian, 432 



form and sculpturing, 158, 160 



germination, 166, 175, 176, 177, 178, 

 309 



helobialian, 439 



mature, 159, 164 



mother-cell wall around, 144 



palm, 448 



ranalian, 385, 388, 401-404, 408, 410, 

 411, 421, 428, 429 



types, 161-163 

 Pollen grain {see Pollen) 

 Pollen sac {see Anther) 

 Pollen tube, 166, 175, 176, 177-181, 200, 

 265, 295, 304, 309, 387, 401, 426 

 Pollination, bat, 172 



beetle, 392, 398, 405, 412, 421, 428, 

 430, 433, 448, 469, 470 



bird, 448 



carpel closure associated with, 174 



gynoecium structure associated with, 

 174 



transitional from entomophilous to 

 anemophilous, 448 



( See also Anemophilv; Entomophily; 

 Hydrophily; Ornithophily) 

 Pollinia, 145, 159, 176 

 Poh/althea, stamen, 392 

 Polycotyledony, 344, 363, 365 

 PolyemlDryony, 345-.347 

 Polygonaceae, anemophily, 173 



anthers, 117 

 dehiscence, 378 



nodes, 25 



ovule, 269, 273 



perispemi, 375 



pollen, 161 

 Pohjgonatum, inflorescences, 84 



leaves, 6, 17 

 Polygonum, ovule, 262, 273 



stamens, 104 

 Polymorphism ( see Carpels, theory of 



nature ) 

 Polypetalae, ovule, 291 

 Polvspory, 145 

 Pomoideae, coenocarpy, 232 



hypanthium, 249, 250 



Pontederin, carpels, 242 



cotyledon, 332 



gynoecium, 240 



leaf, 19 

 Pontederiaceae, gynoecium, 242 



leaf, 18 



venation, 18 

 Populus, Cretaceous genus, 468 



ovule, 260 



pollen, 160, 162 



pollination, 173 

 Porogams, 179 

 Porogamy, 179 

 Portulaceae, male gametophyte, 176 



microsporogenesis, 176 



placentation, 238 

 Posidoni-a, pollen, 158 



stamens, 438 

 Postament, 276 



Potamogetonaceae, anther dehiscence, 

 128 



flower, 439, 440 



hypocotyl, 325 



inflorescence, 78 



ovule, 266 



pollination, 172 



pseudoperianth, 440 



relationships, 440 



stamens, 113, 438. 440 



stipules, 13, 14, 16, 439 

 Potcntilla, carpel, 93 



inflorescence, 72 



ovules, 212 

 vestigial, 413 

 Premn-a, gynoecium, 192 

 Prephanerogamae, new taxon, 278, 380, 



466 

 Primary sporogenous cells {see Arche- 



sporium ) 

 Primula, androecium in, 103 



anther dehiscence in, 128 

 Primulaceae, androecium, 103 



ovules, 260 



placentation, 237, 238 

 Primulales, ovular vascular supply in, 



273 

 Pritcliardia, ornithophily in, 172 

 Procambium, 37, 135, 291 

 Proembryo, 310-312, 314, 317 

 Pwpalmophi/llum, Jurassic fossil palm, 



448, 450 

 Prophylls, anatomy, 17 



definition, 16 



description, 16, 17 



form, 17 



fusion, 17 



nature, 17 



