72 SILVA OF NORTH AMEIUCA. ' ^ 



The wood of Xanthoxylum crlhrosum is very Iieavy and exceedingly hard, althouo-h britth 

 not strong ; it possesses a clear firm grain and is easily worked, and the surface can be made to ^ 

 a beautiful polish ; it contains numerous thin conspicuous medullary rays and is lio-ht orano-e- ■ 1 *^^^7 

 the thin sapwood being rather lighter colored. The specific gravity of the absolutely diy ^00^"' 

 0.9002, a cubic foot of the dry wood weighing 56.10 pounds. It has, when first cut, the odor of t^ 

 true satinwood, a pecuharity which causes this tree to be called Satinwood by the inhabitants of th^ 

 Florida keys, by whom it is used in the manufacture of various articles of furniture, the handles \ 

 tools, and other objects of domestic use. ' ' 



Xanthoxylum crlhrosum was discovered in San Domingo during the first quarter of the centur ' 

 and was detected in Florida by Dr. J. L. Blodgett. ^^^' 



1 Speeimens collected in San Dommgo by Berterio, and commu- herbarium of the Berlin Botanic Garden, where there are also S^ 

 meated m 1824 by Professor Balbis of Turin, are preserved in the Domingo specimens from Knnth's herbarium. ^ 



EXPLANATIOA' OF THE PLATES. 

 Plate XXX. Xanthoxylum cribrosum. 



1. A flowering branch of a staminate tree, natural size. 



2. A flowering branch of a pistillate tree, natural size, 



3. A flower-bud, enlarged. 



4. A staminate flower, enlarged. 



5. Vertical section of a stamijiate flower, enlarged. 



6. A pistillate flower, enlarged. 



7- Cross section of an ovary, enlarged. 

 8. Vertical section of an ovary^ enlarged. 



Plate XXXI. Xanthoxyltibi cribrosum, 

 1- A fruiting branch, natural size. 



2. The ripe fruit, enlarged- 



3. Vertical section of a ripe carpel, enlarged. 



4. Cross section of a seed, enlarged- 

 5- An embryo, much enlarged. 



