He^elmaier 



Ree. Berlin May 27 



Ans. May 30 



'Tubingen, Jan. 21,1869 



Most honored Friend ! 



Asl imagine, that yout return trip from Italy will soon take 

 place, it is about time,that I return those items belonging to you,, 

 which are in my hands., That I am again obliged to you deeplyvyou willl 

 see from a smalllessay, which will be completed in> final print f in the 

 near future, wherein your items besides several others have beere used,, 

 as consciencious and well as I was capable;The systematic treatment 

 of this genus remains difficult, but will become the more possible, 

 the more forms one becoraes aquainted with by and by.. What you may use 

 in America of copies, Dr. Ascherson will deliver. Cömplimentary, of 

 course, to this is the prior essay, of which I have left a conside - 

 rable quantity, which is with pleasure at your Service, if you have any 

 use for it.. 



I send simultaneously mexican duckweeds ( the German word trans- 

 lates ••water-renses" E. D. .) , primarly a mixture of various, which I 

 have identified lately. New of these are only some deviating forms of 

 Wolf f ia ligulata , mostly smaller than previously described" and illus- 

 trated; the one designated as ^ L.yaldiviana yar.abbreviata is a form,, 

 which is very similar to one reeeived from you from New Mexico (Gal- 

 lijo Springs) Between this and the longishr L. valdiviana typtto ( ö.L« 

 Torreyl ) exi st j on the other hand also many between the abbreviata & 

 the still shorter L. minima Phil., as far as one can judge from ve- 

 getative characteristics. (this sentence is not complete ,E?D. ) 

 As long as this one does not exi st in California and L. minima #ets 

 collected in fertile condition, and thereby effects perhaps a dif - 

 ference, I do not know, what to do with it, ; other than to line her 

 up. 



