2o8 



OUTLINES Of PLANT LIFE. 



pollen spores of one flower lodged upon the stigma in 

 another flower of the same sort rather than upon the stigma 



d c' 



Fig. 172. Fig. 173, 



Fig. 172. — The torus of a flower of stonecrop {Sedum iernatum), with the leaves re- 

 moved to show scars ■, two leaves of each kind shown, a, sepal ; 6, petal ; c, stamen ; 

 rf, carpel. Magnified several diam.— After Gray. 

 Fig. 173. — Flower of mousetail (Myosurus mininn/s), halved; showing s, spurred 

 sepal ; s£, stamen ; si', a staminode or sterile stamen, having the position and form of 

 a petal; t, elongated torus covered with carpels, some of which are cut through, 

 showing enclosed ovule. Magnified several diam. — After Engler. 



Fig. 174.— Flower of the strawberry, halved; showing elongated and thickened torus, 

 covered with carpels. Magnified about 3 diam. — After Bessey. 



of the same flower. The process of transfer and lodgment 

 of pollen on a stigma is called pollination. If the pollen 

 from one flower is carried to the pistil of another, it is called 



