146 



Wood hard, heavy, strong, brittle, cross and fine grained, 

 easily worked, taking a fairly good polish, and said to be 

 durable in contact with the soil, Annual rings of grov/th 

 not clearly defined and visible only under the microscope. 



Pores (transverse section) n.imerous, (.166 mm, in dia- 

 meter), round, open or sometimes closed in the heartwood, 

 and arranged either singly or in small groups. Vessel walls 

 (longitudinal sect iOHr) with numerous, small, slightly bor- 

 dered pita, with transitious simple pits. .There two vessels 

 are in contact, the pits are bordered, but where wood paren- 

 chyma and pith ray cells are adjacent the pits are larger, 

 simple, and usually transversely elongated. Perforations 

 simple. Wood fibers about 1.046 mm. long, the walls modera- 

 tely thick and the lumina relatively large, with few simple 

 pits. Wood fibers often septate and occasionally with spiral 

 markings. V/ood parenchyma sparingly developed, liays nume- 

 rous and quite conspicuous under hand lena, from 3 to 6 cells 

 wide and from 5 to 10 times as high.) 



Distribution, common names and uses 



In common with Mason's Vitex, this species is known to 

 the natives by the name of cua Jado or cua j^ and the wood, 

 which is of a light brown color and father hard and lasting, 

 is generally used as building material. It is said to keep 

 long in earth, ITone of the two species have been found, 

 so far, outside of the Isthmus, where they are not unfre- 

 quent in the forests of the lower belt. 



Apocynaceae 

 The arboreous Mountain Jessamine 



Tabem a emontana arborea Rose, Bot, Gaz. 18: 206. 1903 



Description of the tree 

 A tree 10 to 15 m. high, 25 to 35 cm. in diameter at the 



