STANDLEY TREES AND SHRUBS OF MEXICO. 377 



Shrub or tree, sometimes 9 meters high, with a trunk 30 cm. in diameter ; 

 pinnae 1 to 3 pairs; flowers yellowish, fragrant, the spikes 3 to 5 cm. long; 

 fruit flat, 8 to 12 cm. long; wood hard, strong, durable, reddish brown, its 

 specific gravity about 0.85. "Una de gato " (Chihuahua, New Mexico, Texas, 

 Arizona) ; " gatuno " (Chihuahua). 



A gum similar to gum arable, which exudes from the trunk, is used locally. 

 The seeds were used for food by some of the Indians of Arizona and Mexico. 



22. Acacia wrightii Benth. ; A. Gray, PI. Wright. 1 : 64. 1852. 

 Tamaulipas to Sonora and Baja California. Western Texas (type locality) 



to southern California. 



Shrub or tree, sometimes 9 meters high, with a trunk 30 cm. in diameter, 

 the bark thin, broken into grayish brown scales ; pinnae 2 or 3 pairs, the 

 leaflets oblong or obovate; flowers light yellow, the spikes 3 to 5 cm. long; 

 fruit flat, 8 to 11 cm. long, fliin; wood hard, close-grained, light brown, its 

 specific gravity about 0.94. " Ufia de gato" (Nuevo Le6n) ; "una de gato 

 negra " (Tamaulipas). 



The wood is of little use except for fuel. 



23. Acacia iguana Micheli. Mem. Soc. Phys. Hist. Nat. Geneve 34: 281. pi. 25. 

 1903. 



Michoacan and Guerrero ; type from La Puerta. 



Tree, 12 to 15 meters high, armed with short, recurved spines ; leaflets 

 oblong, 8 to 15 mm. long ; flowers yellowish white, the spikes short or elongate. 

 " Rabo de iguana." 



24. Acacia macilenta Rose, Contr. U. S. Nat. Herb. 8: 31. 1903. 



Type from Colima; a fruiting specimen from Jalisco also may belong here. 



Tree, 6 meters high, the trunk 7.5 to 12.5 cm. in diameter ; pinnae 25 pairs 

 or fewer, the leaflets numerous, linear, 4 mm. long; flowers sweet-scented, 

 the spikes 10 to 12 cm. long ; fruit flat, about 11 cm. long and 2 cm. wide, very 

 thin. 



25. Acacia millefolia S. Wats. Proc. Amer. Acad. 21: 427. 1886. 



Chihuahua to Sinaloa ; type from Hacienda San Jose, southwestern Chi- 

 huahua. Southern Arizona. 



Shrub. 3 meters high, with very short spines ; leaflets numerous, linear, 3 

 to 7 mm. long; fruit 10 to 15 cm. long. 



26. Acacia rotundata Benth. Trans. Linn. Soc. Bot. 30: 521. 187.5. 

 Type from somewhere in Mexico ; species not seen by the writer. 



Pinnae 1 to 3 pairs; leaflets few, oblong-linear; spikes lax, about 2.5 cm. 

 long. 



27. Acacia gaumeri Blake, Proc. Biol. Soc. Washington 34: 44. 1921. 

 Known only from Yucatan, the t.vpe locality. 



Tree, 8 meters high ; pinnae 4 pairs ; leaflets 9 to 16 pairs, oblong, appressed- 

 pubescent beneath; spikes paniculate, 1 to 1.5 cm. long; ovary pilose. 



28. Acacia dolichostachya Blake, Proc. Biol. Soc. Washington 34: 43. 1921. 

 Type from Yucatan. 



Stems xmarmed, glabrous; pinnae 5 pairs; leaflets 24 to 29 pairs, linear- 

 oblong, about 3.5 mm. long; spikes 3 to 3.5 cm. long; ovary glabrous. 



29. Acacia compacta Rose, Contr. U. S. Nat. Herb. 8: 31. 1903. 

 Known only from the type locality, Tomellfn Canyon, Oaxaca. 



Shrub, 2 to 3 meters high; pinnae 2 to 5 pairs; flowers yellow, the spikes 

 dense, 2.5 to 3 cm. long ; fruit flat, 10 cm. long, 1.5 cm. wide. 



30. Acacia mammifera Schlecht. Linnaea 12: 563. 1838. 

 Known only from the type locality. Barranca de Acholoya. 



