20 



OBJECT LESSONS IN BOTANY. 



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

 this 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. 26.) 



Fep-. 23. Eeniform leaf of Wild Ginger. Fig. 28. Fraser's Magnolia: obovate- 

 Fig. 24, Eeniform leaf of Pennywort. spatulate, auriculate at base. 



Fig. 25. Peltate leaf of Penny wort. Fig. 29. Oblong leaf of the Toothed 

 Fig. 26. Arrow-shaped leaf of Scratch Arabis. 



Knot-grass. Fig. SO. Three-lobed leaf of Liverwort. 

 Fig. 27. Spatulate leaf of SileneVirginica. 



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

 leaf (Fig. 28), these base lobes remind one oi em^s, and such 

 leaves are said to be auriculate (from the Latm aiiriGula^ an 



19. Desci'ibe tlie cordate leaf, and give examples. The sagittate, and ex- 

 amples. 



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

 Examples. 



