LEGUMINOS^E 399 



Dichrostachys cinerea are oblong-ovate, cordate at the base, 

 shortly petiolate, and in this respect unusual in the tribe. The 

 first leaf is inserted nearly on the same level as the cotyledons, 

 and is abruptly pinnate with numerous very small leaflets. 

 The second leaf is abruptly bipinnate with one pair of pinnae, 

 but the number of the latter increases in succeeding leaves. 



Tribe Eumimosea. The cotyledons of Leucaena glauca 

 (fig. 307) are obovate, sagittate at the base, shortly petiolate, 

 five-nerved, and horizontal, differing in this respect from most 

 of its allies. The first leaf is abruptly pinnate, with numerous 

 pairs of unequal-sided leaflets. The three succeeding ones 

 are bipinnate with a pair of pinnae each. 



The cotyledons of Mimosa lanata are roundly oblong, 

 three- to five-nerved, truncate at the base and auricled. The 

 first leaf has three pairs of leaflets ; the second is like that of 

 Leucaena glauca. 



Tribe Acaciece. The species of Acacia differ remarkably 

 even in the shape and character of the cotyledons ; indeed, no 

 two species have the latter exactly alike. In A. dodoneaefolia 

 they are broadly oblong, sessile, and connate at the base, 

 recalling those of Lupinus sulphurous. The first leaf is 

 abruptly pinnate with four pairs of leaflets, as happens 

 also in A. acanthocarpa. The cotyledons of the latter have 

 a broad shallow sinus at the base. The first leaf is also 

 abruptly pinnate in A. dealbata (fig. 310), A. lophantha, 

 and A. Oswaldi. Two succeeding leaves in the latter case 

 are pinnate, but it seems that subsequent ones gradually or 

 immediately lose all their pinnae, and their leaves are repre- 

 sented by lanceolate trinerved phyllodes. 



The second leaf in A. lophantha, and A. dealbata (fig. 310), 

 is bipinnate. The short, linear-oblong, caducous cotyledons 

 of the latter seem quite unusual in the genus. Those of A. 

 Oswaldi are obovate-oblong, and sagittate at the base. A most 

 remarkable development of the basal auricles occurs in A. Bur- 

 kittii (fig. 308). The first six leaves are bipinnate, with one pair 

 of pinnae each and numerous pairs of narrowly oblong leaflets. 



Tribe Ingece. The cotyledons of Pithecolobium Saman are 

 caducous. The first leaf is abruptly pinnate, and succeeding 

 ones bipinnate, with one pair of pinnae and a varying number 



