Olneya. 



LEGUMINOS/E. 27 



The bark of the root is tonic, or in large doses purgative and emetic. 

 The locust was formerly widely planted as a timber tree ; its cultivation 

 in the United States is now generally abandoned on account of the de- 

 structive attacks of the locust-borer (Cyllene picta). 



78. Robinia viscosa, Vent. 

 Clammy Locust. 



High Alleghany Mountains of North Carolina. 



A small tree, 9 to 12 metres in height, with a trunk not exceeding 0.30 

 metre in diameter ; very rare and local in a wild state, but now widely 

 cultivated and occasionally naturalized in the Atlantic States. 



Wood (of a cultivated specimen) heavy, hard, close-grained, compact; 

 layers of annual growth clearly marked by many rows of open ducts ; 

 medullary rays numerous, thin ; color brown, the sap-wood light yellow. 



79. Robinia Neo-Mexicana, Gray. 

 Locust. 



Southern Colorado, through western and southwestern New Mexico to 

 the Santa Catalina and Santa Rita Mountains, Arizona, and in southern 

 Utah. 



A small tree, sometimes 6 to 8 metres in height, with a trunk 0.15 

 to 0.25 metre in diameter, or toward its upper limits of growth reduced 

 to a low shrub; reaching its greatest development in the valley of the 

 Purgatory River, Colorado. 



Wood heavy, exceedingly hard, strong, close-grained, compact, satiny, 

 containing many evenly distributed open ducts; medullary rays thin, con- 

 spicuous ; color yellow streaked with brown, the sap-wood light yellow. 



80. Olneya Tesota, Gray. 

 Iron-ivood. Arhol de Hierro. 



California, valley of the Colorado River south of the Mohave Moun- 

 tains, valley of the lower Gila River, southwestern Arizona ; southward 

 in Sonora. 



A small tree, in the United States rarely 9 metres in height, with a 

 trunk sometimes 0.45 metre in diameter ; dry arroyos and canons ; in 

 Sonora more common and of larger size. 



Wood very heavy and hard, strong, brittle, close-grained, compact ; the 

 grain generally contorted, difficult to cut and work, susceptible of a high 

 polish ; medullary rays numerous, thin ; color rich dark brown streaked 

 with red, the sap-wood clear bright yellow ; occasionally manufactured into 

 canes and other small objects. 



