348 GLOSSARY 



Plivsiological — Having reference to the function or life work 



of the plant. 

 Picca — A genus of tlie Conifer family. 

 Piiuiiiiii — A garden devoted to the culture of pine-trees. 

 Pingiiicula — The generic name of the butterworts. 

 Piiius — A genus of the Conifer family. 

 Pistil — The female part of the Hower consisting of ovary, 



style, and stigma. 

 Pistillate — Applied to flowers having the pistil only. 

 Pith — The soft tissue in the centre of the stem. 

 Plumbago — The generic name of the leadworts, small 



flowering plants and shrubs 

 Pliimiilc — The first stem shoot of the germinating seed. 

 Poa — A grass. 

 Poinsett ia — A genus of Mexican plants having bright scarlet 



bracts and small flowers. 

 Pollard — A tree trunk with its branches cut short. 

 Pollen — The fertilising or male part of the flower. 

 Pollination — The act of conveying the pollen from the 



stamen to the stigma. 

 Polypctalous — Separate or many petals. 

 Polysepalous — Separate or many sepals. 

 Polytrichum — The generic name of the hair moss. 

 Potassium — The metallic base of potash. 

 Proboscis — The feeling and feeding organ of an insect. 

 Prothallus — The first growth when the spore of a fern 



germinates. 

 Protococcus — A genus of unicellular plants forming a green 



stain upon trees, &c. 

 Protoncma — The first growth of the moss-spore. 

 Protoplasm — A highly complex substance forming the essen- 

 tial part of all living cells, and to which all life growth 



is due. 

 Prototypes- — First forms of plant-life. 

 Psamma — A genus of the grass family. 



