4 
Uyi 
. 18 
. . Yar. y. brevispinus : aculeis gracilioribus radialibus 8-11, cen- 
/, ~/~-fralibus 4 teretibus cum infimo hamato radiales vix superantibus. 
East of El Paso, near the Pecos and San Pedrb Rivers, and 
along the middle course of the Rio Grande : var. a. south of the Rio 
Grande. FI. July and August. — Plants from \ - 2 feet high; the 
larger ones ovate ; areolse distant; spines very different in size, in the 
different varieties ; radial spines 1 -3|, central spines 1| - 6J inches 
long ; flowers 2-J - 3| inches long ; seeds similar to the last, but with 
much larger pits. .* 
§ 2. Cornigeri. 
A. Heteracanthi. 
9. E. Wislizeni, E. in Wisl. Rep.: giganteus, globoso-ovatus; 
costis 21 compressis crenatis; areolis elongatis; aculeis radialibus 
summis infimisque 6 robustis rectis seu curvatis, lateralibus 14 - 20 
(additis subinde-summis brevioribus fasciculatis) tenuibus elongatis 
flexuosis; centralibus 4 robustis angulatis annulatis rubellis, 3 supe- 
rioribus rectis, inferiore canaliculato deorsum hamato ; floribus flavis ; 
bacca ovata squamosissima; seminibus reticulatis. 
Valley of the Rio Grande about El Paso, and thence to the Upper 
Gila: fl. July and August. — Plant 2-4 feet high ; diameter smaller; 
radial spines 1-2, central ones 1^-3 inches long. Flowers 2J- 
) inches long. 
10. E. Lecontei, E. in P. R. R.: giganteus, obovato-clavifor- 
mis; costis 20 - 30 compressis crenatis ; areolis elongatis ; aculeis 
radialibus- summis infimisque 6 - 10 robustis angulatis plus minus 
curvatis, lateralibus 10 -16 (addidis subinde summis brevioribus fas¬ 
ciculatis) tenuibus elongatis flexuosis, centralibus 4 robustis com¬ 
pressis annulatis corneis, 3 superioribus sursum inferiore subinde 
subhamato deorsum curvatis; floribus flavis ; bacca ovata squamosa; 
seminibus scrobiculatis. 
On the lower parts of the Gila and Colorado Rivers, and in Sonora: 
fl. August and September. Very similar to the last, but a more slen- 
* d er > °f ten quite clavate plant; larger specimens 3-4 feet high, and 
pf only one third that diameter ; arrangement of spines similar, but 
generally 5 (not 3) radial spines below the lowest central one ; cen- 
* tral spines more compressed, upper ones curved, lower one rarely 
somewhat hooked; flower, fruit, and seed smaller; seed more ob¬ 
long and pitted. 
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