Till M.ivi'lll.Y Hi LLETIN. 



■17 



Sneozeweed (Ililan'tim pubervlum . 



[odine Bush, or Kith Greasewood (Spirostachys occidental! 



Hop Sage Grayia spinosa). 



In addition to these few species there are perhaps a hundred others 

 which need investigation. Among them are many of the showy insed 

 pollinated sorts which may be more important than we think or which 



Fig. '.'. Spiny clotliur. Xanthium spinosum, a very prolific weed 

 certain sections of California. Known also as Spanish 

 needles. (Newman Mo. Bui., Cal. Com. Hort.) 



may cause hay fever by direct inhalation or under special circumstances. 

 The results will be reported in the medical journals and elsewhere, but 



in the meantime thus.- es] ially interested in the subjed should consult 



the reports of Dr. W. Scheppegrell, president of the American Hay- 

 Fever-Prevention Association. The most available of these is Keprint 

 No. 349 from the Public Health Reports of the United States Public 

 Health Service. This deals with the subject in a general way. but I 

 understand that the author is soon to issue a report dealing more 

 specifically with hay fever plants of the Pacific states. 



