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.) 



Fig. 23. Reniform leaf of Wild Ginger. 

 Fig. 24. Reniform leaf of Pennywort. 

 Fiff.25. Peltate leaf of Penny wort. 

 Fig. 26. Arrow-shaped leaf of Scratch 



Knot-grass. 

 Fig. 27. Spatulate leaf of Silene Virginica. 



Fig. 28. Eraser's Magnolia: obovatc- 

 spatulate, auriculate at base. 



Fig. 29. Oblong leaf of the Toothed 

 Arabia. 



Fig. 80. 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, ar 



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

 tuples. 



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

 Examples 



