30 



OBJECT LESSONS IN BOTANY. 



38. Every one knows that the number of leaflets in the 

 Clover is three ; also in the Bean, and in this figure (62) of 

 the Desmodium leaf. Such leaves are called ternate. But 

 here the pupil will notice another important distinction. In 

 this Desmodium leaf, the odd leaflet is stalked, and is said 

 to be pinnately ternate ; in Clover, the 

 odd leaflet is nearly sessile, like the 

 other leaflets ; this is palmately ternate. 



Fig. 64. Honey Locust. 



Fig. 65. I'ui.-^iiii Hemlock. 



39. rig. 64 represents a ii-pinnate (that is, twice pinnate) 

 leaf of Honey Locust. The simple leaflets seem to have 

 each become itself a pinnate leaf. And still more compound 

 is this Poison Hemlock leaf, being tri-pinnate, or thrice pin- 

 nate (Fig. 65). In the same manner, we have bi-ternate and 

 tri-ternate. 



38. How many leaflets in a ternate leaf? Difference between tlie pin- 

 nately and the palmately ternate ? 



39. Can you define a bi-pinnate leaf? Tri-pinnate ? What is a bi-temate 

 leaf ? A tri-ternate ? 



