STANDLEY— TREES AND SHRUBS OF MEXICO. 381 



48. Acacia elegans Schlecht. Liunaea 12: 569. 1838. 

 Tepic to Guerrero and Morelos ; type from Regla, Hidalgo. 



Shrub or small tree, 2.5 to 5 meters high, unarmed ; leaflets linear, 3 to 5 mm. 

 long ; flowers white ; fruit thin, flat, straight, about 1 cm. wide. 



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



Chihuahua to Zacatecas and Puebla ; type collected near Mexico City. Texas 

 to Arizona. 



Low shrub, unarmed ; leaflets oblong, 2 to 4 mm. long ; flowers white ; fruit 

 thin, flat, about 6 mm. wide, brown. 



It is not certain that the name cuspidata really belongs to the plant to which 

 it is applied here. 



50. Acacia angustissima (Mill.) Kuntze, Rev. Gen. PI. 3': 47. 1898. 

 Mimosa anffustissima Mill. Gard. Diet. ed. 8. Acacia no. 19. 1768. 

 Acacia ylaltrata Schlecht. Linnaea 12: 569. 1839. 



Acacia elegans Mart. & Gal. Bull, Acad. Brux. l(f: 312. 1843. 



Acacia insignis Mart. & Gal. Bull. Acad. Brux. lO'': 315. 1843. 



Distributed almost throughout Mexico ; type from Campeche. Central Amer- 

 ica ; southern United States. 



Shrub or small tree, 2 to 4 meters high, unarmed, pubescent or glabrate ; 

 leaflets mostly 3 to 5 mm. long ; flowers white, the heads axillary or racemose ; 

 fruit thin, flat, brown. The following names are reported for this and the 

 closely related species (nos. 42^8): " Xaax " (Yucatan, Maya); " timbe " 

 (Baja California, Oaxaca, San Luis PotosI) ; " cantemo " (Tabasco) ; " guajillo " 

 (Sinaloa) ; " palo de pulque" (Oaxaca). 



In Oaxaca the bark is used for tanning skins and for inducing fermentation 

 in tepache, 



51. Acacia laevis Standi. Contr. U. S. Nat. Herb. 20: 185. 1919. 

 Known only from the type locality, near Guadalajara, Jalisco. 



Plants glabrous, unarmed ; leaflets numerous, 4 to 5 mm. long, pale beneath ; 

 flower heads in long racemes. 



52. Acacia penicillata Standi. Contr. U. S. Nat. Herb. 20: 185. 1919. 

 Jalisco and Oaxaca ; type from Cerro de San Felipe, Oaxaca. 



Pinnae 3 to 5 pairs, the leaflets 8 to 13 mm. long ; flower heads racemose, 

 about 2 cm. in diameter ; fruit flat, about 8 cm. long and 1.2 cm. wide, glabrous, 

 glaucescent. 



53. Acacia tequilana S. Wats. Proc. Amer. Acad. 22 : 409. 1887. 

 Durango, Jalisco, and San Luis Potosi ; type from Tequila, Jalisco. 

 Glabrous shrub, 1.5 to 3 meters high, unarmed ; leaflets 0.8 to 2.5 cm. long ; 



flowers white, the heads in long naked racemes ; fruit 4.5 cm. long and nearly 

 1 cm. wide, flat, thin, glaucescent. 



54. Acacia paniculata Willd. Sp. PI. 4: 1074. 1806. 



Acacia picachensis T. S. Brandeg. Univ. Calif. Publ. Bot. 6: 179. 1915. 



Michoacan to Oaxaca. West Indies and South America ; type from Brazil. 



Shrub or small tree, sometimes scandent, armed with short recurved spines ; 

 leaflets very numerous, 3 to 5 mm. long, glabrous ; flowers white ; fruit flat, 

 8 to 15 cm. long, 2 to 2.5 cm. wide, brown, glabrous. " Rabo de iguana " ( Micho- 

 acan, Guerrero) ; "rabo de lagarto," " espino " (Oaxaca) ; " tocino " (Cuba). 



55. Acacia berlandieri Benth. Lond. Journ. Bot. 1: 522. 1842. 

 Acacia tephroloba A. Gray, PI. Wright. 1: 65. 1852. 



Coahuila to Veracruz and Queretaro ; type from Nuevo Leon. Western Texas. 



Shrub, 1 to 4.5 meters high, pubescent, armed with short spines ; leaflets 

 numerous, 3 to 6 mm. long; flowers white, sweet-scented; fruit flat, 9 to 16 cm. 

 long, 2 to 3 cm. wide, straight or curved, very densely velvety-puberulent. 



