INDEX 



227 



Polycotyledenous seeds, 108 

 Polygala senega, root, Fig. 73, p. 



128 



Polygonum arifolium, Fig. 78, p. 

 137 



hydropiper, Fig. 98, p. 161 



sagittatum, Fig. 92, p. 155 

 Polystichum acrostichoides, Fig. 



39, p. 75 



Polytricum, Fig. 30, p. 64 

 Pome, 197 



Fig. 126, p. 198 



Poplar, Carolina, Figs. 86, 102, pp. 

 148, 167 



Fig. 92, p. 155 

 Poppy, Fig. 132, p. 205 

 Populus deltoides, Figs. 85, 86, 102, 

 pp. 147, 148, 167 



tremuloides, Fig. 92, p. 155 

 Pores, 182 

 Porocidal capsule, 203 



Fig. 132, p. 205 

 Potato, Fig. 109, p. 179 

 Potentilla pumila, Fig. 79, p. 138 

 Prickly ash, northern, Fig. 102, p. 



167 



Primary or first root, 130 

 Primine, 184 



Prince's pine, Fig. 101, p. 166 

 Prismatic corolla, 180 

 Procarp, 32 

 Procubent plants, 139 



Fig. ~79, p. 138 

 Progressive metamorphosis, 180 



Fig. 110, p. 181 

 Proliferation, 69 

 Proterandrous flowers, 190 

 Proterogynous flowers, 190 

 Prothallial cells, 101 

 Protococcus, 22 



Fig. 1, p. 23 



habitat and morphology, 22 



histology, 22 



physiology, 23 



reproduction, 22 



respiration, ,24 

 Protonema, 68 

 Protoplasm, 18 



Prunus cerasus, Figs. 125, 134, pp. 

 196, 212 



serotina, Fig. 99, p. 164 



virginiana, Figs. 92, 96, pp. 155, 



161 

 Pseudomonas radicicola, 38 



Pteridophytes, 21 

 Puffballs, 55 



Fig. 22, p. 54 

 Pulvinus, 151 

 Putamen, 192 

 Putrefactive bacteria, 38 

 Pyrola elliptica, Fig. 101, p. 166 

 Pyrus communis, Fig. 126, p. 198 



Q 



QUACK grass, Fig. 75, p. 134 

 Quercus alba, Fig. 92, p. 155 



nigra, Fig. 96, p. 161 



prinus, Figs. 93, 94, pp. 157, 158 



sp., Fig. 123, p. 194 



R 



RACEME, 174 



Fig. 107, p. 174 

 Radicle, 117, 130 



Ranunculus acris, Fig. 122, p. 193 

 Raphanus raphanis, Fig. 129, p. 



201 



Raphe, 184 



Rayed anthodium, 176 

 Rayless anthodium, Fig. 108, p. 175 

 Receptacle, 176, 177 

 Refrigeration, 41 

 Regular flowers, 187 

 Reniform base of leaves, 156 



Fig. 92, p. 155 

 outline of leaves, 162 



Fig. 96, p. 161 

 Repand margin of leaves, 156 



Fig. 93, p. 157 

 Repent plants, 139 

 Fig. 79, p. 138 

 Reproduction, 19 

 asexual, alga?, 22, 30 

 black mold, 47 

 ferns, 80 

 liverworts, 52 

 mosses, 68 

 nostoc, 26 

 white pine, 98 

 yeast, 44 



sexual, black mold 49 

 ferns, 80 

 liverworts, 57 

 mosses, 83 



