Guaiacum. MALPIGIIIACE.E. — ZYGOPIIYLLACE.E. 7 



18. Tilia heterophylla, Vent. 

 White Basswood. Wahoo. 



Alleghany Mountains from Pennsylvania, southward to northern Ala- 

 bama and Florida ; west to middle Tennessee and Kentucky, southern 

 Indiana, and southern and central Illinois. 



A tree 15 to 20 metres in height, with a trunk 0.G0 to 1.20 metres in 

 diameter ; rich woods and bottom-lands ; most common and reaching its 

 greatest development along the western slopes of the southern Alleghany 

 Mountains and in middle Tennessee. 



Wood light, soft, not strong, close-grained, compact, easily worked ; 

 medullary rays numerous, obscure; color light brown, the sap-wood 

 hardly distinguishable ; generally confounded with that of Tilia Americana, 

 from which it scarcely differs. 



The young branches are often fed to cattle in winter by farmers in the 

 southern Alleghany Mountains. 



MALPIGHIACE^E. 



19. Byrsonima lucida, HBK. 

 Tallow Berry. Glamberry. 



Southern keys of semi-tropical Florida ; through the West Indies. 



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

 0.25 metre in diameter, or often shrubby and branching from the ground. 



Wood light, soft, weak, close-grained, compact ; medullary rays numer- 

 ous, thin ; color light red, the sap-wood a little lighter. 



Fruit edible. 



ZYGOPHYLLACE^E. 



20. Guaiacum sanctum, L. 



Lignumvita. 



Keys of semi-tropical Florida, not rare ; in the Bahamas, St. Domingo, 

 Cuba, Porto Kico, etc. 



A low, gnarled tree, not exceeding, within the limits of the United 

 States, 8 metres in height, with a trunk sometimes 0.30 metre in di- 

 ameter. 



Wood exceedingly heavy, very hard, strong, brittle, close-grained, com- 

 pact, difficult to work, splitting irregularly, containing many evenly dis- 

 tributed resinous ducts ; medullary rays numerous, obscure ; color rich 

 yellow-brown, varying in older specimens to almost black, the sap-wood 

 light yellow ; used in turnery and for the sheaves of ships' blocks, for 

 which it is preferred to other woods. 



Lignum Guaiaci, Guaiacum-wood, the heart of this and the allied 

 G. officinale, formerly largely used in the treatment of syphilis, is now 



