388 PRACTICAL BOTANY 



tudinal section of this organ ; 4:d^ the capsule in the calyx, 

 dehiscent ; all magnified. 



5, Abutilon Avicennee, a flower ; 5<2, the calyx in fruit, 

 both the natural size ; 5Z>, the tube of stamens ; 5c, an 

 anther; both magnified. 



6, Tilia Americana, a bract bearing the inflorescence ; 

 G^, fruit ; both the natural size ; 65, a petal with its cluster 

 of stamens ; 6(?, the pistil ; GcZ, a stamen ; all magnified. 



7, Geranium, a flower, of natural size ; 7<^, united pis- 

 tils with the stamens on the receptacle magnified ; 75, the 

 receptacle in fruit, natural size. 



8, Impatiens f ulva, a flower ; 8o^, the perianth displayed ; 

 85, capsule ; 8c, capsule dehiscent ; all the natural size. 



9, Xanthoxylum Americanum, part of a young branch, 

 with a thorn and leaves ; 9«, sterile flowers ; 95, fruit ; all 

 the natural size ; 9c, pistils in the calyx ; 96?, a sterile 

 flower ; both magnified. 



PLATE Y. 



1, Acer rubrum, part of a branchlet with sterile flow- 

 ers; la, a fertile flower; both the natural size; 15, a 

 sterile flower; Ic, a fertile flower; both magnified; Id, 

 the double samara, the natural size. 



2, Polygala pauciflora, an entire flower ; 2a, the sepals ; 

 25, the corolla with the stamens ; all the natural size ; 

 2c, the free portion of the stamen- tube, magnified. 



3, Robinia, the corolla; 3a, the same separated into 

 its pieces ; 35, the fruit — all the natural size ; 3c, stamen- 

 tube, magnified. 



4, Potentilla IN'orvegica ; flowers of the natural size ; 

 4a, a flower, from which the petals are removed, cut 

 through vertically, to show the receptacle with the numer- 

 ous pistils on its surface, and the stamens inserted on the 



