52 



HOW PLANTS GROW. 



Interriiptedhj pinnate, when some of the leaflets of the same leaf are much smaller 

 than the rest, and placed between them, as in the Water Avens. 



Abruptly pinnate, when there is no odd leaflet 

 at tlie end, as in Honey-Locust, Fig. 130. 



Odd-pinnate, when there is an odd leaflet at 

 the end, as in the Common Locust (Fig. 128) and 

 in the Ash. 



Pinnate ivith a tendril, when the footstalk is 

 prolonged into a tendril, as in Fig. 129, and all 

 of the Pea tribe. 



148. Pinnate leaves may have many or few 

 leaflets. The Bean has pinnate leaves of only 



131. Palmate leaf, of 5 leaflets. tlirCC IcaflctS. 



149. Palmate leaves generally have few 

 leaflets ; there is not room for many on the 

 very end of the footstalk. Common Clover 

 has a palmate leaf of three leaflets (Fig. 

 136) ; Virginia Creeper, one of five leaflets 

 (P'ig. 72), as well as the Buckeye (Fig. 131) ; 

 while the Horsechestnut has seven, and some 

 Lupines from eleven to seventeen. 



150. Twice or Thrice Compound Leaves are 



not uncommon, both of the pinnate and of 

 the palmate sorts. Wliile some leaves of 

 Honey-Locust are only once pinnate, as in ^^^v 

 Fig. 130, others are doubly or twice pinnate, 

 as in Fig. 132. Those of many Acacias are 

 thrice pinnate. Fig. 133 represents oue of 

 the root-leaves of INIeadow-Rue, which is 

 of the palmate kind, and its general footstalk 

 is divided into threes for four times in suc- 

 cession, making in all eighty-one leaflets ! 

 When a leaf is divided three or four times, 

 it is said to be decompound. This is ter- 

 nately decompound, because it divides each 

 time into threes. 



132. A Iwice-pinnate leaf of Honey-Locust. 



