CLASSIFICATION OF ANGIOSPERMS. 587 



RESINS are balsamic resins, of which there are several commercial 

 varieties : Mauritius tacamahaca is obtained from Protium hepta- 

 phyllum of Columbia, and Mexican or West Indian tacamahaca 

 from Burscra tomentosa of Mexico, West Indies, and South 

 America. INDIA BDELLIUM is a resin obtained from the bark of 

 Commiphora Roxburyhiana of Northwestern India and Belu- 



FIG. 325. Myrrh plant (Commiphora abyssinica): A, young branch showing tri- 

 foliate leaves; B, flowering and fruiting stern with thorn-like branches; C, leaf axis in which 

 occur a fruit and staminate and pistillate flowers; D, staminate flower in longitudinal 

 section; E, longitudinal section of pistillate flower; F, longitudinal section of fruit showing 

 arillus-like mesocarp and the easily dehiscent endocarp. After Engler. 



chistan. CopAL-like resins are obtained from Canarium ben- 

 galense (East Indian Copal) and possibly several species of Bur- 

 sera. BLACK DAMMAR resin is obtained from Canarium ros- 

 tratum of the Molucca Islands. OLIBANUM or Frankincense is a 

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

 Somaliland. AMERICAN OLIBANUM or Soft Resin of Cayenne 

 exudes spontaneously from the stems of Protium heptaphyllum 

 and P. guianense. GILEAD BALSAM is obtained from Protium 



