Ree, Dec. 18 

 Ans, Jlan t , 28 



Dyck Nobember 22,185^ 



Your Wellborn 



I take the honor to mail to you by book-post the ^3rd Nb* of the 



Garten Zeitung-, in which you will find remarks about the genus^ Echina* 



gsis» Though this genus belongs to the suuthern part of America; as.. 



however 2 species have been attributed to Mexico, which 1 , aecording tcr 



my opinion belong to the sectionr Echinocerel , the essay may have some 



interest for you the greerrty\uvy proves again to be a good charac- 



ter ; but H put the JEchinocactusr cinnaburinus Hook to the genus' Echi - 



nopsis. . Should these short-tubed species at some time be elevated' to 



their own genus ??The future will decide;;in the raeantime, it suffices,, 



unexpected 



to have them -put together. - What do you say to the jappearance of arr 



entirely abnormal form of flowers, , which gives a new proof of the in - 



completeness of our knowledge, and, by the way, shows simultaneouslyr 



the Utility of the subdivisions of the family into tribus. ~ r did 



not want to create right away a new genus, because I am convnicetf, . that 



the E.formosa and jmrata belong there too,, and I posess of both spe - 



cies old and mature speeimens,, which can come into flower any year.. 



Ifr f ormulating the dia^nosis of a genus it is always desirable, where 



possible, to deduce it from several species.. It is rarely the ccase, 



thatta diagnosis based on a Single species, must not later be modl - 



fied for something* and ,as there is no hurry, it is better to waii?.. 



The genus would by the way be in the tribus cereastreae exactlyr that,, 



which- Nopalea is in the tribus Opuntlae; : it would differntiate itself 



from the other genus- througft- its "" gentalia ultra limbuBr coaretator ~ 



the Ist 3 tribus would be composed of 

 erectumUonge producta« . . Ac^ordTng to this in the Fut^fEF^H^o^ 



wi ng genera« 



