A RUBBER PLANT SURVEY 



OF 



WESTERN NORTH AMERICA 



I. CHRYSOTHAMNUS NAUSEOSUS AND ITS VARIETIES 



HARVEY MONROE HALL 



11. CHRYSIL, A NEW RUBBER FROM CHRYSOTHAMNUS 

 NAUSEOSUS 



HARVEY MONROE HALL and THOMAS HARPER GOODSPEED 



III. THE OCCURRENCE OF RUBBER IN CERTAIN 

 WEST AMERICAN SHRUBS 



HARVEY MONROE HALL and THOMAS HARPER GOODSPEED 



