62 FOREST TREES OF NORTH AMERICA. 



MESQUIT. ALGAROBA. HONEY LOCUST. HONEY POD. 



Texas, valley of the Trinity river (Dallas, etc.) to the northern and western limits of the state ; west through 

 New Mexico aud Arizona to the mesas west of the San Bernardino mountains, California, reaching southern 

 Colorado, southern Utah (Saint George), and southern Nevada; southward through southern Mexico ; in Jamaica. 



A tree of the first economic value, sometimes 9 to 15 meters in height, with a trunk 0.90 meter in diameter, 

 or much smaller, often reduced to a low shrub ; on dry prairies and high rocky plains, or west of the Eocky mountains, 

 along desert streams, here often forming open forests, and reaching its greatest development within the United 

 States in the valley of the Santa Cruz and other streams of southern Arizona ; in western Texas (Fort Stockton, 

 etc.), on account of the annual burning of the prairies, rarely 1 meter in height, the roots then enormously 

 developed, often weighing several hundred pounds, forming, as they are here locally known, " underground forests" 

 and furnishing the best and cheapest fuel of the region. 



Wood heavy, very hard, not strong, close-grained, compact, difficult to work, almost indestructible in contact 

 with the soil, containing many evenly-distributed, rather large, open ducts ; medullary rays numerous, distinct ; 

 color, rich dark brown or often red, the sap-wood clear yellow ; specific gravity, 0.7652 ; ash, 2.18 ; of the root, 

 specific gravity, 0.8493 ; ash, 3.02 ; exclusively used for the beams and underpinnings of the adobe houses of New 

 Mexico, Arizona, and northern Mexico; for posts and fencing, and occasionally in the manufacture of furniture, the 

 fellies of heavy wheels, etc. ; the best and often the only fuel of the region, burning slowly with a clear flame, and 

 producing valuable charcoal, but unsuited for the generation of steam on account of its destructive action upon 

 boilers. 



A gum resembling gum arable is yielded by this species ; the unripe and pulpy pods rich in grape sugar, edible, 

 and furnishing valuable and important fodder. 



94. Prosopis pubescens, Bentham, 



London Jour. Bot. v, 82 ; Rev. Mim. in Trans. Linnsean Soc. xxx, 380. Walpers, Ann. i. 259. Watson in King's Rep. v, 420 ; PI. 

 Wheeler, 8. Brewer & Watson, Bot. California, i, 163. Rothrock in Wheeler's Rep. vi, 42, 107. Hemsley, Bot. Am.-Cent. 

 i, 344. 



P. odorata, Torrey in Fremont's Rep. 313, 1. 1 (for fruit). 

 P. Emoryi, Torrey in Emory's Rep. 139. 



Strombocarpa pubescens, Gray in Smithsonian Contrib. iii, 60 ; v, 51 ; Ives' Rep. 9. Torrey & Gray in Pacific R. R. Rep. ii, 

 163. Torrey in Pacific R. R. Rep. iv, 11, 20, 82; v, 360, t. 4; vii, 10; Bot. Mex. Boundary Survey, 60. Cooper in 

 Smithsonian Rep. 1858, 259 ; Scientific Press, San Francisco, Nov. 1871 & f.- Vasey, Cat. Forest Trees, 12. 



Strombocarpa odorata, Torrey in Sitgreaves' Rep. 158. 



SCREW BEAN. SCREW-POD MESQUIT. TORNILLA. 



Valley of the Eio Grande (Presidio), western Texas, westward through New Mexico and Arizona (valley of the 

 Gila and Colorado rivers) to southern California (White Water, Parish Brothers, Vallecito, Thurber), and southward 

 into Mexico; southern Utah (Saint George), and southern Nevada (Ash Meadows). 



A small tree, rarely 9 meters in height, with a trunk sometimes 0.30 to 0.45 meter in diameter, or often a tall, 

 much-branched shrub; sandy or gravelly bottom lands, reaching its greatest development within the United 

 States in the valleys of the lower Colorado and Gila rivers. 



Wood heavy, exceedingly hard, not strong, brittle, close-grained, compact, containing many evenly-distributed 

 open ducts ; medullary rays numerous, thin ; color, light brown, the sap-wood somewhat lighter ; specific gravity, 

 0.7609 ; ash, 0.95 ; used for fuel and fencing. 



The pods used as fodder, and sometimes made into flour by the Indians. 



95. Leucaena glauca, Bentham, 



Hooker's London Jour. Bot. iv, 417 ; Rev. Mim. in Trans. Linnsean Soc. xxx, 443. Walpers, Rep. i, 884. Griaebach, Fl. British Weet 

 Indies, 220. Hemsley, Bot. Am.-Cent. i, 351. Watson in Proc. Am. Acad. xvii, 350. Chapman, Fl. S. States, Suppl. 619. 



Mimosa glauca, Linnaeus, Spec. 2 ed. 1504. 



Acacia glauca, Willdenow, Spec, iv, 1075. De Caudolle, Prodr. ii, 467. 



Acacia frondosa, Willdenow, Spec, iv, 1076. De Candolle, Prodr. ii, 468. 



Acacia biceps, Willdenow, Spec, iv, 1075. De Candolle, Prodr. ii, 467. 



Mimosa leucocephala, Lamarck, Diet, i, 12. 



Acacia leucocephala, Link, Enum. Hort. Berl. ii, 444. De Candolle, Prodr. ii, 467. 



Mimosa biceps, Poiret, Suppl. i, 75. 



Mimosa frondosa, Klein in Poiret, Suppl. i, 76. 



