(93) 



Pods less than S mm. broad, contracted between the seeds : 



leaflets less than i mm. broad. 4. A. constricta. 



Pods over 15 mm. broad, not constricted between the seeds : 



leaflets over 2 mm. broad. 5. A. Roemeriana. 

 Flowers in elongated spikes or racemes. 

 Pods over 10 mm. broad. 



Flowers sleuder-pedicelled. 6. A. Wrightii. 



Flowers sessile or nearly so. 7. A. Greggii. 



Pods less than 10 mm. broad. 8. A. amentacea. 



I. Acacia Berlandieri Benth. 



Acacia Berlandieri Benth. Lond. Journ. Bot. 1 : 522. 



1842. 



On dry bluffs and volcanic mounds, southern Texas and 



Mexico. 



2. Acacia filicioides (Cav.) Trelease. 



Mimosa filicioides Cav. Icon. 1 : 55.7^/. 78. 1791- 

 Acacia filicioides Trelease ; Branner & Coville, Rep. Geol. 

 Surv. Ark. 1888: Part 4, 178. 1891. 



On prairies and in sandy soil, Missouri and Kansas to Texas, 

 Arizona and Mexico, and in Florida. The wholly or partially 

 glabrous form, occurring in Texas and Florida, is A. fili- 

 cioides Texensis : \_Acacia Texcnsis T. & G. Fl. N. A. 1 : 



404. 1840]. 



3. Acacia cuspidata Schlecht. 



Acacia cuspidata Schlecht. Linnaea, 12 : 573. 1838. 

 In dry soil, Texas to Arizona. 



4. Acacia constricta Benth. 



Acacia constricta Benth. ; A. Gray, PI. Wright. 1 : 66. 

 1852. 



On gravelly terraces and slopes, southern Texas to New 

 Mexico and adjacent Mexico. 



5. Acacia Roemeriana Scheele. 

 Acacia Roemeriana Scheele, Linnaea, 21 : 456. 1848. 

 On limestone hills, southern Texas, New Mexico and 



Mexico. 



6. Acacia Wrightii Benth. 



Acacia Wrightii Benth. ; A. Gray, PI. Wright. 1 : 64. 

 1852. 



