7 



indefinitely and every year produce young thorns. 



In the Pilocereus Hoppenstedt the flowers grow only from the new born areolas. It flowers & 

 like the Anhalonium and the Echinocactus cephaloidei, for example the Echinocactus ingens. 

 Echinocactus pilosus does not belong to this group and was incorrectly classified by Salm). L 

 us that all the species that have a terminal cephalium have to flower vertically. Now if the flo 

 areolas would not be new born areolas, the cephalium would not be terminal but would be pk 

 contiguous to the top, as is seen in certain Pilocereus for example the jubatus, Houllitianus, h 

 etc. 



The Cereus Tetezo differs from the Cereus Hoppenstedt from the flowering point of view by 

 modifications undergone by the flowering areolas. Its top, when it has flowers and fruits reser 

 exactly the one of the Echinocactus with a bear vertex such as the Echinocactus electrocanthi 

 flowering period seems quite prolongued. Its summit has outside fruits and its interior flowen 

 buds. I regret not having been able to make a drwing of this Observation but at least I will try 

 it photographed by Mr Hoppenstadt himself. 



In summary these Cierges apiciflores, have according to me, a vertical florescence similar to 

 Echinocactus that grow next to them.If you refuse this designation from one you must also rel 

 from the others. One could object and say: Well, why not? However this is not my opinion. 1 1 

 that the vertical or nearly vertical or lateral flowering is nearly indifferent among the Cereus. 



Among the Cereus marginatus and pugioniferus, just as in the Cereus per uvianus, etc. in our 

 collections edulissimus, in my notes) they grow exclusively from the areolas born since the pr 

 flowering season . the flowers grow indistinctly from all the old areolas; whereas in the Pitay 

 Cereus and all the old areolas are sterile, exactly as in the Echinocactus. Is there not a very di 

 difference? I don't agree with the similarity of the florescence with that of the Echinocactus. 



You indicated a differencial characteristic between the Cereus and the Echinocactus, that I re, 

 have not researched more carefully because I was not paying attention. You said that the 

 Echinocactus flower grows from the elongated areola, whereas in the Cereus it grows from a 

 the epidermis.This obervation is true for most of the specimens of this gender but it is not gen 

 will research this subject next spring but I will immediately mention two exceptions. Look at 

 observations of Forster in the Handbook of Cacti at the bottom of page 91, well! That note is 

 applied to the Echinocactus Monvilli. If I recall correctly they are the same in the gibbosus et 

 it is by the way easy to verify this subject. On the other hand I can reaffirm a fact that surprise 

 however I did not include it in the descriptions taht I sent you: In the Cereus marginatus, the i 

 come out of the middle of the oculiferous areola. Because in this species each areola can proc 

 even several flowers between the thorns. 



You can see how many times we have exceptions at each step, whenever we want to generali; 



I want to give you the complete list of the Cereus that I found in Mexico: 

 Cereus ( Echinocereus) pentalophus (Berlandini procumbens) 



Dippei (cinarascens, enneacanthus) 



Straminus (ASaltillo) 



acifre (San Luis Potosi) 



pectinatus (caspitosis) 









in 



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