214 PIONEERS OF SCIENCE IN AMERICA. 



preciation by attaching his name to a beautiful genus of the 

 Rosacea. Elias Durand said of him immediately after his 

 death : " No other explorer of the botany of North America 

 has personally made more discoveries ; no writer on American 

 plants, except perhaps Prof. Asa Gray, has described more new 

 genera and species." 



