430 PHARMACEUTICAL BOTANY 



Phyl'lotaxy. The arrangement of leaves on stems. 



Phylloxan'thin. See xanthophyll. 



Phylog'eny. The history of the race. 



Phys'iology. The science which treats of the functions of living organisms. 



Phy'ton. A term given by Gaudichaud to an internode with a node at its upper 



extremity which bears one or more leaves, in the axils of which buds may 



appear. 



Ptteus. The cap of a toadstool. 

 Pilif'erous. Bearing hairs. 



Pilose'. Covered with long, straight and scattered hairs. 

 Pin'nate. Applied to compound leaves when the leaflets are arranged along the 



mid-rib. 



Pinnat'ifid. Pinnately-clef t . 

 Pinnatipar'tite. Pinnately-parted. 

 Pinnat'isect. Pinnately-divided. 

 Pin'nule. A secondary pinna. 

 Pi'siform. Pea shaped. 

 Pis'til. The central female organ of a flower consisting of one or more united 



carpels. 

 Pis'tillate. Applied to flowers that possess one or more carpels but no fertile 



stamens. 

 Placen'ta. The nourishing tissue which connects the ovules with the wall of 



the ovary. 



Placenta'tion. The arrangement of the placenta within the ovary or the peri- 

 carp. 

 Plasmo'dium. A multinucleated naked mass of protoplasm having amoeboid 



movement. The vegetative body of a Slime Mold. 

 Plasmorysis. A contraction of the protoplasm of a cell due to the extraction 



of contained water under the influence of reagents of greater density than 



the protoplasmic sap. 



Plas'tid. Protoplasmic bodies of various shapes scattered about in the cyto- 

 plasm. 

 Ple'rome. A meristem found in the apical regions of plant axes which gives 



rise to fibrovascular tissue. 

 Pli'cate. Folded like a fan. 

 Plumose'. Feathery. 



Plu'mule. The rudimentary bud between the cotyledons. 

 Pluriloc'ular. Having more than one chamber or cell. 

 Po'lar Body. A portion of a gamete budded off before fertilization. 

 Pol'len. The fertilizing dust composed of cells produced in the anthers of 



flowers. 

 Pollina'tion. The transfer of pollen from anther to stigma and subsequent 



germination thereon. 



