FORMS OF SIMPLE LEAVES. 



41 



A deltoid leaf folium 

 deltoides (fig. 48). 

 (From the Greek letter 

 A, delta, and eidos, re- 

 semblance.) 



Example : the Populus 

 nigra. 



A dentate leaf folium 

 dentatum (fig> 47). 

 (From the Latin, dens, a 

 tooth.) The edge having 

 horizontal, distant teeth. 

 This term, as well as the 

 following, refers only to 

 the edge or margin of the 

 leaf, without regard to its 

 general form. 



Example : Populus grandidentata. 



A serrate leaf folium 

 serratum (fig. 48). 

 (From the Latin, serra, 

 saw.) The edge being 

 cut into notches, like saw 



Fig. 46. DELTOID. 



Fig. 47. DENTATE. 



Fig. 48. SERRATE. 



Fig. 49. RHOMBOID. 



teeth, ending in sharp points, which incline towards the apex of 

 the leaf. 



The nettle, rose, and peach, are examples. 



A rhomboid leaf folium rhom- 

 boideum ($^.49). Rhomb-shaped 

 <C>- A rhomb, in geometry, is a 

 four-sided figure, having its opposite 

 sides equal. When the angles are 

 right angles, it becomes a square. 



An auriculate, or eared 

 leaf folium auriculatum 

 (fig- 50 ); (From the 

 Latin, auricula, a little 

 ear.) It has two small 



rounded lobes, projecting _ AURICULATE< 



at the base. 



The Magnolia auriculata and Rumex acetosella are ex- 

 amples. 



4* 



