

Tfef. 580-7 





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PREFACE. 



Under direction of the Board of Trustees, the six- 

 teenth annual report of the Missouri Botanical Garden is 

 presented to the puplic. 



The fifteenth volume was issued on April 30th, 1904, 

 which is to be regarded as the date of publication of the 

 scientific papers it contains except that by Professor Coul- 

 ter, separates of which were distributed on March 24th, 

 1904. 



These reports are sent to scientific institutions and jour- 

 nals in exchange for publications or specimens desirable for 

 the Garden, and, when possible, reprints of the botanical 

 articles they contain are presented to botanists occupied 

 with a study of the subjects they refer to. Any of the 

 Garden publications not out of print may be purchased at 

 approximately the cost of publication from Mess. R. 

 Friedlander & Sohn, Berlin, Germany; W. Wesley & Son, 

 London, England; or the undersigned. 



William Trelease. 





St. Louis, Mo., April 24, 1905. 



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