FORMS OF LEAVES. 155 



the most part, a joint at its union with 

 the branch. 

 Triangulares triangular, having three pro- 

 minent angles, without any reference to 

 their measurement or direction, as in 

 the genus Chenopodium, Cochlearia 

 danica, t 696, and some leaves of the 



Ivy. 



Quadrangulare, with four angles, as the 

 Tulip-tree, Liriodendrum tulipifera, 

 Sm. Ins. of Georgia, 1. 102. Curt. Mag. 



t. 275. 

 Quinquangulare, with five angles, as some 



Ivy leaves, &c. 

 Deltoides, trowel-shaped or deltoid, hav- 

 ing three angles, of which the terminal 

 one is much further from the base than 

 the lateral ones, as Chenopodium Bonus- 

 Henricus, Engl Bot. 1. 1033, and some 

 leaves of Cochlearia danica. A wrong 

 figure is quoted for this in Phitosophia 

 Botanica, which has caused much con- 

 fusion. 

 Bhombeum, rhomboid, or diamond-shaped, 

 approaching to a square, as Chenopodium 

 olidum, t. 1054, Trapa natans, Camcr. 



