(95) 



Leaflets 20-40, mostly thrice as long as broad : pods with membranous 

 valves. 2. L. glauca. 



Leaflets 12-16, mostly less than twice as long as broad: pods with 

 leathery valves. 3. L. rctusa. 



1. Leucaena pulverulenta (Schlecht.) Benth. 

 Acacia -pulvcrulenta Schlecht. Linnaea, 12: 571. 1838. 

 Leucaena pulverulenta Benth. Lond. Journ. Bot. 4: 417. 

 1842. 



In rich soil, southern Texas and Mexico. 



2. Leucaena glauca (L.) Benth. 



Mimosa glauca L. Sp. PI. 520. 1753. 



Leucaena glauca Benth. Lond. Journ. Bot. 4: 416. 1842. 



In sandy or rocky soil, Florida to Texas and Mexico. A 



native of tropical America, now widely distributed in tropical 



regions. 



3. Leucaena retusa Benth. 



Leucaena retusa Benth. ; A. Gray, PI. Wright. I : 64. 

 1852. 



On plains and prairies, southern Texas and New Mexico. 



9. ACUAN Medic. Theod. Sp. 62. 1786. 



[Desmanthus Willd. Sp. PI. 4: 1044. 1806.] 



Stamens 5. 



Pods 4-6 mm. wide, in compact heads : peduncles longer than the pods. 



1. A. Illinoensis. 

 Pods 2 mm. wide, in loose clusters : peduncles shorter than the pods. 



2. A. kptiloba. 



Stamens 10. 



Leaves mostly with 8-12 pinnae. 



Stems glabrous or nearly so : peduncles 1-2 cm. long. 



3. A. Jamesii. 



Stems velvety pubescent : peduncles 2.5-5 cm - lon g- 



4. A. velutina. 



Leaves mostly with 2-6 pinnae. 

 Peduncles 1-2.5 cm. lonj<. 



Leaf-rachis and its branches glabrous : leaflets not ciliate. 



5. A. depressa. 

 Leaf-rachis and its branches pubescent : leaflets ciliate. 



6. A. acuminata. 



Peduncles 4-12 cm. long. 



