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MISSOURI BOTANICAL GARDEN. 



tion was issued by Engelmann and Gray as Plantae Lind- 

 heimerianae * Part I, in 1845, while the collections of 1845 to 

 1848 were in part described in 1850 as Part II of the same. 

 The collaboration of Engelmann and Gray in this publication 

 led to a life-long friendship between them and proved of the 

 greatest advantage to both in the prosecution of their scien- 

 tific work. Gray with his larger herbarium and library did 

 many of the critical determinations for Engelmann, while the 

 latter kept more in touch with the various exploring expedi- 

 tions, which made St. Louis their outfitting point, and sup- 

 plied many of the field botanists to accompany them, and 

 his critical studies in some of the most difficult genera are 

 still regarded as classics in botany. Indeed the influence of 

 Engelmann in the study of the flora of the Middle West is 

 marked and the great work done in America by the German 

 botanists of the last century deserves more than passing 

 notice. 



No one can do much in systematic botany in America with- 

 out soon becoming acquainted with the names of Engelmann, 

 Lindheimer, Geyer, Fendler, Wislizenus, Gattinger, Hilgard,' 

 Liiders, Riehl, Rugel, Eggert and a host of others of German 

 origin. Many of these, like Engelmann and Lindheimer, 

 were trained in the German universities and came to America 

 to secure the freedom denied them in their native land. 

 Others, as Maximilian and Roemer, simply made scientific 

 expeditions into unexplored regions of the United States and 

 published the results of their work on their return to Germany, 

 while many others devoted their spare moments to botany 

 through mere love of Nature, without intention of publica- 

 tion or hope of reward, and it was these that turned to Engel- 

 mann for encouragement and assistance in their work. Geyer, 

 Fendler and Lindheimer did practically all their work in co- 

 operation with Engelmann, while many other botanists of 

 German descent looked to him for assistance in their botanical 



* Plantae Lindheimerianae, Part I, was issued about Sept. 23, 1845 

 and Part II about May 27, 1850; as shown by Gray's unpublished letters 

 to Engelmann: the names given in part I therefore antedate those of 

 Scheele in vols. 21 and 22 of Linnaea and in Part II all those of Scheele 

 subsequently published. 



