Index and Glossary 



209 



PIL 



Pileorhiza (Gr. pilose a cap ; rhiza^ a 

 root). The protecting layer of cells 

 which covers the growing point of 

 roots, 29 



Pimpernel, 176 



Pitfipinella, i6g 



PinBj fertilisation of, 128 



Pine^ germination of, 27 



Pink, 161 



Pinnate (Lat. pinnaius, feathered). A 

 leaf .where the leaflets are arranged on 

 each side like the harhs of a feather, 80 



Pistil (Lat. pisiillum, a pestle). The 

 inner whorl of floral organs, 100, 118 



Pistillate flower. A flower destitute of 

 stamens, loi 



Pisnm, 163, 164 



Pith (AngJo- Saxon pUka, marrow). 

 The internal column of parenchyma- 

 tous cells found in the stems of dicoty- 

 ledons, 44 



Pitted cells. Cells where the secondary 

 deposit is arranged in little pits or 

 channels, 18 



Placenta (Lat. a cake). The part of the 

 ovary to which the ovules are attached, 



t20 



Placentation. Attachment of ovules to 



the placenta, 120 

 Placeutiform. A flattened form of root, 



32 

 Plant, definition of, i 

 Plicate (Lat. plicatns, folded). The 



arrangement of the leaf in the bud 



when it is folded up like a lady's fan, 



64 

 Plumule (Lat. plnmnla, a little feather). 



The undeveloped stem in the embryo, 



4 

 Plumule, development of, 40 

 PogostemoHy 174 

 Pollen (Lat. fine fiour). The fine dust 



within the anthers of the stamens, 



177 

 Pollination. The act of pollen grains 



falling upon the the stigma, 125 

 Polyadelphous (Gr. polits, many ; adel- 



^hoSf a brother). Union of stamens 



into several bundles, 114 

 Polygamous (Gr. polus, many ; gamos, 



marriage). Where upon the same 



plant there are staminate, pistillate, 



and perfect flowers, 102 

 Potygonatum, 183 

 Polyhedral (Gr. poltts, many ; kedra, a 



side). Applied to cells of many sides 



or face.s, 17 

 Polypetalous {Gr. poliis, many ; petalon^ 



a leaf). Applied to the corolla 



where the petals are separate, 107 

 Polysepalous (Gr. polus, many ; Low 



Lat. sepalnvt, a sepal). Applied to the 



calyx where the sepals are ^stinct, 104 

 Vome (Lat. pamut/i, an ap^le). A berry- 

 like pseudocarp as seen in the apple, 



142, 166 

 Pofuece, 166 

 Poplar, 179 



RAD 



Portuguese Laurel, 165 



Potato, structure of, 57 



Potentilla, 165 



Poteriuui, 166 



Praefloration(Lat.jSns, before ;^oj,/?(?rw, 

 a "flower). The arrangement of the 

 parts of the flower in the bud, 113 



Prasfoliation (Lat. prce, before; folium, 

 a leaf). The arrangement of the 

 leaves in the bud, 63 



Primine (Lat. primus, first). The inner 

 coat of the ovule, 122 



Pri-mrose, 176 



Priinose, fertilisation of, 132 



Prim.ula^ 176 



PrimulacecE, 176 



Procambium (Gr, pro, before, and cam- 

 biuni). The formative tissue which 

 first builds up the fibro-vascular bun- 

 dles, preceding the true cambium, 41 



Prosenchyma(Gr./^oj, towards ; egcheo, 

 to pour in). Cellular tissue where the 

 cells are long and pointed, 24 



Protandrous (Gr. protos, first ; aner, 

 man). Flowers where the stamens are 

 ■ ripened before the pistil, 131 



Protococcus, I 



Protogynous (Gr. protos, first ; g%ine, 

 woman). Flowers where the pistil is 

 ripened before the stamens, 131 



Protoplasm (Gr. protos, first ; plasma, 

 anything moulded). The living con- 

 tents of the cell from which the new 

 cells are produced, 7 ; movements of, 

 8 



Prtinus, 1 6s 



Pseudocarp (Gr. pseudos, false ; karpos, 

 a fruit). Applied when any part of 

 the plant besides the ovary is united 

 with the fruit, 135, 141 

 Purslane, 177 



Pyrus, 166 



Pyxis (Lat. a box). A capsule which 

 dehisces transversely, so that the upper 

 part comes oflf like a lid, 138 



QUADRIFOLIATE (Lat. guadrans, 

 a fourth part ; folium, a leaf). A 

 leaf with four leaflets, 80 

 Qttercus, 180 

 Quinate (Lat. quinque, five). A leat 



with five leaflets, 80 

 Quince, 167 



T?ACEME (Lat. racemus, a bunch). 

 -'•^ A form of indefinite inflorescence 



with lengthened axis and stalked 



flowers, 95, 96 

 Radiating veined (Lat. radius, a sun* 



beam), 76 

 Radical (Lat. radix, a root). Growing 



from a point close to the summit of the 



root, 85 

 Radicle (Lat. radicula, diminutive of 



radix, root). The part of the embryo 



P 



