20 



OBJECT LESSONS IN BOTANY. 



elegant figure in tliis and in the Lilac, &c. But sometimes 

 tliis peculiar enlargement at base becomes excessive, and the 

 figures more curious than elegant. Such is the arrow-shaped 

 figure, called sagittate^ having long-pointed base lobes, as 

 seen in the Arrow-head (Fig. 47), the Scratch Knot-grass, &c. 

 (Fig. 20.) 



26 29 25 84 



i^^. 23. Eeniform leaf of Wild Ginger. Fig. 28. Fraser's Magnolia: obovatc- 



Fig. 24. Eeniform leaf of Pennywort. 

 Fig. 25. Peltate leaf of Pennywort. 

 Fig. 26. Arrow-sliaped leaf of Scratch 



Knot-grass. 

 Fig. 27. Spatulateleafof SileneVirginica. 



fipatulate, auriculate at base. 

 Fig. 29. Oblong leaf of the Toothed 



Arabis. 

 Fig. SO. Three-lobed leaf of Liverwort. 



20. In the common Sorrel leaf, and in Fraser's Magnolia 

 leaf (Fig. 28), these base lobes remind one of ears'^ and such 

 leaves are said to be auriculate (from the Latin auricula^ an 



19. Describe the cordate leaf, and give examples. The sagittate, and ex 

 amples. 



20. Describe the auriculate form, and give examples. The reniform. 

 Examples. 



