EXOGENOUS SERIES— BROADLEAF IVOODS. ii7 



Greenheart. Nectandra rodiali. 



Nomenclature. 



Greenheart (local and common name). 



Locality. 



British Guiana and adjacent portions of South America and the 

 West Indies. 



Features of Tree. 



Twenty-five to sometimes seventy feet in height, two to four 

 feet in diameter. A straight tree. 



Color, Appearance, or Grain of Wood. 



Heartwood dark green to chestnut or nearly black, sapwood 

 similar. Clean, straight, compact structure, free from knots. 

 Numerous pores, annual layers hardly distinguishable. 



Structural Qualities of Wood. 



Exceptionally heavy, strong, and durable, tough, hard, elastic, 

 receives high polish, breaks suddenly. 



Representative Uses of Wood. 



Ship-keels, frames, rollers, turnery, also beams, planks, and 

 piles (Europe). In America tops of fishing-rods and very 

 occasionally veneers. 



Weight of Seasoned Wood in Pounds per Cubic Foot. 

 72 (Lazlett). 



Modulus of Elasticity. 

 1,090,000 (Lazlett). 



Modulus of Rupture. 

 10,000 (Thurston). 



Remarks. > 



Excessive weight unfits it for many purposes. Placed in first 

 class of ship-building woods by Lloyd's Register. Formerly 

 supposed to repel teredo. Generally exported through 

 Demerara to England. 



