CLASSIFICATION OF ANGIOSPERMS. 



311 



phyllinn of Columbia, and Mexican or West Indian tacamahaca 

 from Bursera touicntosa of Mexico, West Indies, and South 

 America. India Bdellium is a resin obtained from the bark of 

 Commiphora Roxburghiana of Northwestern India and Behi- 

 chistan. CoPAL-Hke resins are obtained from Canarium Ben- 

 galense (East Indian Copal) and possibly several species of 



m 



Fig. 160. Cross-section of the bark of one of the Burseraceas probably Commiphora 

 Myrrha: P, bark made up of sclerotic cells (st) and cork (d) ; o, more or less regular secretion 

 canals, one of which (o) shows the irregular spreading of the gum-resin; m, medullary rays; 

 b, bast fibers; k, crystals of calcium oxalate; p, parenchyma. After Vogl. 



Bursera. Black Dammar resin is obtained from Canaruun ros- 

 tratum of the Molucca Islands. Olibanuim or Frankincense is a 

 gum-resin obtained from several species of BoszveUia of Asia and 

 Somali Land. American Olibanum or Soft Resin of Cayenne 

 exudes spontaneously from the stems of Protiitin heptaphylUim 

 and P. gitianeiisc. Gilead Balsam is obtained from Protium 

 altissimnm and P. carana of Guiana and Brazil. Mexican Lin- 



