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-sha]ged 

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

 seen in the Arrow-head (Fig. 4:7), the Scratch Knot-grass, &c. 

 (Fig. 26.) 



26 29 25 8* 



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



Fig. 2i. Eeniform leal' of Pennywort. 

 Fig. 25. Peltate leaf of Pennywort. 

 Fig. 26. Arrow-shaped leaf of Scratch 



Knot-grass. 

 Fig. 27. Spatulateleafof SileneVirginica. 



spatulate, auriculate at base. 

 Fig. 29. Oblong leaf of the Toothed 



Arabis. 

 Fig. 30. 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. 



30. Describe the auriculate form, aind give examples. The reniform. 

 Examples. ' 



