INDEX AND GLOSSAKY 



351 



Perianth: floral envelopes of lily -like 



plants (more properly of monocoty- 



ledonous plants), (275). 

 Periblem, 253. 



Pericarp: ripened ovary, (286). 

 Peiichaetia, 190. 



Perigynous: borne around the ovary, 

 Peristome, 191. [(283). 



Perithecium, 183. 



Persistent: remaining attached, (204). 

 Personate, 137. 

 Petal: one of the separate leaves of a 



corolla, (251). 



Petiolule: stalk of a leaflet, (196). 

 Petiole: leaf-stalk, (194). 

 Petunia, 330, Figs. 489, 490. 

 Phaseolus, 319, Figs. 471, 472. 

 Phellogen, 266. 

 Phenogam: seed-bearing or flowering 



plant, (325), 286. 

 Philadelphus, 323. 

 Phloem, 257. 

 Phlox, 137, 225, Fig. 218. 

 Phosphorus, 72. 

 Photosynthesis: the making of organic 



matter from CO-z and water, in the 



presence of light, (163). 

 Phyllodium: leaf -like petiole, (214). 

 Phyllotaxy: arrangement of leaves and 



flowers on the stem, (111). 

 Physostegia inflorescence, Fig. 175. 

 Picea, 288, Figs. 270, 271, 424. 

 Pie plant, 305, Figs. 78, 79. 

 Pigweed, 3, 62, Figs. 372, 383, 384. 

 Pine, 15, 287, Figs. 10, 21, 145, 272, 421-3; 



cone, Fig. 272 ; foliage, Fig. 145 ; stem, 



Fig. 407; tell-tale, Fig. 364; trees, Fig. 



353; pollination, 132. 

 Pink, 307; dehiscence, 152, Fig. 250. 

 Pinnate, 91. 

 Pinnatifid, 92. 



Pinus, 287, Fig. 421-423. fgan, (253). 



Pistil: ovule-bearing or seed-bearing or- 

 Pistillate: having pistils and no stamens, 

 Pisum sativum, 317, Figs. 190, 284. f(257). 

 Pitchforks, 162. 

 Pits, 237. 

 Plankton, 199. 

 Plantain inflorescence, 116. 

 Plant-breeding, 231. 

 Plant-food denned, 64. 

 Plasmodium, 235. 



Plerome, 253. 



Plum, 20, 321, Figs. 194, 262, 478, 479; 



phyllotaxy, 49; pollination, Fig. 202; 



blossom, Fig. 194; drupe, 153, Fig. 262; 



thorns, 104. 



Plumule: bud in the embryo, (305). 

 Plur-annual : of one season's duration 



because killed by frost, (14). 

 Pod: dehiscent pericarp, (287). 

 Poinsettia bracts, 107; starch, 247-249. 

 Polarity, 50. 



Polianthes tuberosa, 296. 

 Pollards, 54, Fig. 87. 



Pollen germinating, Fig. 203. f 17S> 



Pollen: spores borne by the stamen, (254), 

 Pollination: transfer of pollen from sta- 

 men to pistil, (263). [(279). 

 Pollinium : pollen in a coherent mass, 

 Polygonatum, 294. [108. 

 Polygonum, 306, Figs. 193, 455; climbing, 

 Polyhedral, 233. 

 Polypetalous : corolla of separate parts 



or petals, (251). 



Polypode, 173, 285, Figs. 306, 307. 

 Polyporus, Fig. 121. 

 Polysepalous : calyx of separate parts or 



sepals, (251). 



Polytrichum commune, 189, Figs. 338-340. 

 Pome: fruit of apple, pear, etc., (298). 

 Poplar bud, 36 ; cuttings, 27 ; dioecious, 



133; inflorescence, 117; phyllotaxy, 49; 



shape, 60, Fig. 97; seeds, 161. 

 Poppy, opium, 246. 

 Portulaca fruit, Fig. 254. 

 Pot marigold, 337. 

 Potassium, 72; hydroxide, 241. 

 Potato, 16, 35, 153. 330, Figs. 24, 42, 219; 



and osmosis, 68; cuttings, 24; flower, 



137, Fig. 219; inclusions, 249; onion, 33, 



Figs. 45,46; sprouts, 31, 76, 85, Fig. 42; 



starch, 31, 35, 248, 249, Fig. 42; sweet, 

 Potato-tomato graft, 28. [16, 329. 



Potentilla, 320. 

 Prickles, 105. 

 Prickly ash, 105, Fig. 157. 

 Primrose fruit, Fig. 249. 

 Primula Sinensis, 270. 

 Prince's feather, 306. 

 Propagation by buds, 22; leaves, 22; roots, 

 Prophase, 239. [20. 



Prosenchyma, 255. 

 Prostrate plants, 204. 



