2 



Echin. Schurri )with fruit) 

 Mami Ilaria Heydeni applanata (common) 

 Main i Ilaria spherica? (Longimammae) 

 Mamillaria macromeris ( in bloom ) 



Three other species of Mamillaria, I have not yet analyzed accurately. The first belong to 

 the very numerous and variable group of the Cornifera. They distinguish themselves 

 mainly by their crepitant stem and the absence of central thorns and secondly that they 

 look like the Mamillaria vetula, but belong to the Coryphanta because of its small central 

 flowers ( small, very small). The third are a part of a group of the conoidea, that has small 

 pockmarked crepitant stems and have a distinct vertical flower with ciliary sepals and 

 white yellow petals with a purpurescent median line with purple streaks and yellow 

 antennae. They have green Stylus and Stigmata. 



Echinocereus crespitosus 



Echinocereus dysnei (various forms) 



Echinocereus leptacanthus (various forms- Berlandini) 



Cereus tubinosus (flowering, common). The flowers come out of the end of ramifications, 

 but not as Poselger says, from the end of the stalk. They appear in the spot were there was 

 Vegetation from the year before. 



Cereus edulissimus (Pitaya), very similar to the Opuntia frutescens ( extremely common). 

 This species is spread in large quantities from San Luis Potosi up to the north. The 

 Opuntia imbricata and tunicata is always found close to the Cereus, all the way to Saltillo 

 but not found here. The Opuntia vaginata that you said had been seen by Gregg, near San 

 Luis Potosi, is evidently the Opuntia frutescens. 



In regards to the other Nopales (Platopuntia), that are by the way less varied here than in 

 the south, I have not yet had the courage of undertaking their study. 



Charco Escondido, April 12. 



Because tomorrow we have to join a column that comes from Matamoros under the 

 command of General Mejia, our letters could be dispatched to Matamoros. I am going to 

 send by this route, the package that I had prepared. It contains a small box with a number 

 of seeds, that I collected in various locations in Mexico. I address it to a business in 

 Matamoros, asking them to send it only by the quiekest and safest route possible. 

 I think that in a few days I again will take the route from Monterrey, rejoining my brigade 

 as it passes by the north of Nuevo Leon, that is to say, Villaldama and Monclova. 

 Today I do not have time to write to you again. On my return to Monterrey, I hope I will 

 find your response to my message from the month of November. If it was definitely lost, I 



