(94) 

 In dry soil, Texas, New Mexico and adjacent Mexico. 



7. Acacia Greggii A. Gray. 



Acacia Greggii A. Gray, PL Wright. 1 : 65. 1852. 



In limestone soil and gravelly terraces, Texas and Mexico. 



8. Acacia amentacea DC. 



Acacia amenlacca DC. Prodr. 2: 455. 1825. 

 On plains and hillsides, Texas, from the Guadalupe River 

 to the Pecos, and in northern Mexico. 



7. VACHELLIAWight&Arn.* Prodr. Fl. Ind. 272. 1834. 



Shrubs or small trees, with spreading branches and straight 

 spines. Leaves alternate : blades 2-pinnate, with 8-16 pin- 

 nae : leaflets numerous (20-50 in each pinna), relatively 

 small. Flowers polygamous, in globular spikes. Calyx 

 simulating the corolla but only about ]/ 2 as long, shallowl}' 

 5-lobed. Corolla tubular-funnelform, shallowly 5-6-lobed, 

 the lobes as broad as high. Stamens very numerous: fila- 

 ments distinct. Ovary sessile : style filiform. Pod stout, 

 turgid, nearly terete or usually broader than high, scarcely 

 dehiscent, filled with a pulp which separates the two rows of 

 seeds and the individual seeds from each other. 



1. Vaciiellia Farnesiana (L.) Wight & Arn. 



Mimosa .Farnesiana L. Sp. PI. 521. 1753* 



Acacia Farnesiana Willd. Sp. PI. 4: 1083. 1806. 



Vachellia Farnesiana Wight & Arn. Prodr. Fl. Ind. 272. 

 1834. 



On sandy or clayey plains and prairies, southern Texas 

 and Mexico, and naturalized in Florida. Widely distributed 

 in tropical and warm countries. 



8. LEUCAENA Benth. Lond. Journ. Bot. 4: 416. 1842. 



Leaves with 15-18 pairs of pinnae: branches tomeutose : leaflets less than 

 1.5 mm. broad. 1. L. pulvcrulenta. 



Leaves with 2-8 pairs of pinnae : branches glabrous or glabrate : leaflets 

 over 1.5 mm. broad. 



* Specimens of a species representing a related genus were collected by 

 Mr. I Idler at Corpus Cliristi, Texas, in 1894; but the material at hand is 

 insufficient for satisfactory stud\ . 



