3 Prince Salm May 1, l8kB 



what use I could nake of your observations ( in my new editiorr ) 



I 1 ^ the characters of the genera the geminatio can not be used well? 



as tbis should. serve for bisher affirities of the ^e^era thenselves t , 



and for the f ormation o^ fanilies and classes. . Genus characteristics 



could in tum- be taken fron the visible fruitin.gr parts ff and the mi- 



croscopic examination of seeds is not part of tbis», Just that I nrust 



object to your diagnosis of the genus Hob inocereus . It diverges only 



fron the genus Cereus through the tubus abbreviatus ; the length,how- 



ever, is only a very relative character, and tbere are enough $erei t , 



for which the Perigonlitabus is no longer than for Schinoce^eus 



coesuitosus (which I have seen in flower) - In. the genus Echinopsls 



arrannrenent of" the 



in contrast, the generic character is derived" from the ]f ilaments : 

 It says tbere " st am Ina biserialia serie una fundo tubi inserta in- 

 versus perlgonii linbun a nticun fasciculatun convercrente» serie al- 

 tera cum to to tubo connata et orificio tubi * quasi circulatinr inserta" 

 Tbis is a most striking character and of total correctness in the ol- 

 der species, such as Eclr ». opygona , raultirlex , Syriosii . turbinata. 

 zuccarinil : e.a. , which, however, has not been con.fi med for nany new 

 species, which one puts there.. They all come fron northern Brasil 

 and fron Chile». 



I was not able to figure out, if Your Wellborrr takes the Oer ei' 

 § Polylouhi '- witb your Ecbinocerei ? I an inclined to beliebe so, as 

 you put the C, , Roeneri tbere: - but of tbis later, when I get to the 

 genus Cereus- . - My tribus Melocacteae will in future consist of the 

 genera Arhalonium , . Pelecyuhora, Manlllaria , Melocactus , and Disco - 

 cactus . In your area you. have only Manlllaria e , and I walt with impa- 

 tience for your shipnent. . Fron Mr. Otto I reeeived several years ago 

 M* slnills and sulcata in very sickly speeimens, which I have lost. 

 The seeds of tbese species, which you transmitted to ne, germinated 

 welll; only, tbese plant s are still sraalll, and mature speeimens will 

 be very welcome to ne. ■ That mach I was able to judge, that, if the 



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 Botan ical 

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