PRE FACE. 



Under 





Missouri Botanical Garden is presented 



to the public. The 



March 



from 



fixing the date of their publication, were issued as 



follows : 



Jamaica and 



Grand Cayman, March 9, 1893;* Trelease, Further Studies 

 of Yuccas and their Pollination, March 9, 1893. Reprints 

 of papers from the present volume were issued in advance 

 of its publication, as follows: Bay, Bibliography of the 



May 



Study of the Vena 



tion of Salix, October 5, 1893; Trelease, Sugar Maples 

 and Maples in Winter, January 1, 1894; Trelease, North 

 American Species of Gayophytum and Boisduvalia, January 

 5, 1894. The last three articles have been slightly cor- 

 rected before the printing of the volume. 



The reports of the Garden are sent regularly to scientific 

 institutions and journals in exchange for publications de- 

 sirable for the work of the Garden, and, so far as is pos- 

 sible, reprints of the botanical articles which they contain 

 are sent to botanists to whom these papers are directly use- 

 ful in their work. The regular agents for the sale of 

 Garden publications are Dr. A. E. Foote, of Philadelphia, 

 W. Wesley & Son, of London, and R. Friedlander & Sohn, 

 of Berlin. 



St. Louis, Jan. 11, 1894. 



William Trelease 



* An important correction to this article should be made on p. 171, line 10, by 

 substituting 178 for 718. 



(3) 



