150 FIRST JOURNEY IN EUROPE. [1839, 



Britain. He cares little, however, for proper system- 

 atic botany, for which I am sorry. He has shown me 

 some curious things. 



I have learned from Brown the character he ob- 

 served in our species of Rhexia, that is, the true genus 

 Rhexia : the unilocularity of the anthers. . . . 



Tuesday evening, March 12. After a hard 

 day's work I finished on Monday evening with the 

 Linnsean herbarium, which I found more interesting 

 than I expected and more satisfactory, as it is in 

 really good state, carefully taken care of, etc. i had 

 some very good notes to make. I assure you I feel 

 much gratified to have studied this collection, which, 

 with the Gronovian, enables us to start fair as to Lin- 

 naean species. Do you know that Acer saccharinum, 

 Linn., is A. eriocarpum (spec. Kalm) ! Look at Lin- 

 naeus " Species Plantarum " (which you have not, un- 

 fortunately, though it is the most necessary of books ; 

 you will receive it at the same time as this letter or 

 nearly) and you will find that the description is all 

 drawn from Eriocarpum. 



I took what time I could to-day for the Gronovian 

 plants and a few of Plukenet's, etc., but was unable 

 to finish ; will go to-morrow, for I shall work to the 

 last moment. 



I have been tempted to buy a collection of Hart- 

 weg's l very fine Mexican plants, which being col- 

 lected far in the interior of north Mexico are very 

 North American, and quite necessary, I think, for us. 

 They will reach you with the other parcels. Be care- 

 ful about the little labels with the numbers stuck on. 

 Bentham will publish them presently. . . . 



1 Theodore Hartweg, died in 1871. Explored in Mexico and Cali- 

 fornia, 1836 to 1847; later director of the Grand -ducal Gardens, 

 Swetzingen, Baden. 



