THE LEAF 



4t 



rachis may or may not terminate in a leaflet, and ac- 

 cordingly the leaf is said to be impari-pinnate or 

 PARI-PINNATE. The primary rachis is comparable to 

 the mid-rib, the secondary rachises to the secondary 

 ribs, and the tertiary rachises to the tertiary ribs of 

 a simple pinni-veined leaf. In fact, if the blade of a 

 pinni-veined leaf is cut up into segments between the 



Fig. 3g. — Pari-piniiate Leaf of 

 TentuI {Tamarhidus indica) 



Fig. 40. — Tripimiate Leaf of Sajina 

 {^Moringa pierygospervta) 



secondary and the tertiary ribs, it will give rise to 

 a compound pinnate leaf. Tamarind or tentul (see 

 fig. 39), bak (Sesbania grandiflora) and kal-kasonda 

 {Cassia) are examples of simple pinnate leaf with no 

 terminal leaflet, that is, pari-pinnate; krishna-chura 

 {Ccesalpinia pulcherrimd), big krishna-chura or 

 Gold Mohur {Poinciana regia), babla {Acacia), are 

 examples of bi pinnate leaf; sajina {Moringa pterygo- 

 sperma) (see fig. 40) and neem {Melia) are examples 

 of tripinnate leaf. As the presence- of three leaflets 

 is very common, such pinnate leaves are termed ter- 



