18 
Var. y. BREVISPINUS: aculeis gracilioribus radialibus 8-11, cen- 
tralibus 4 teretibus cum infimo hamato radiales vix superantibus. 
East of El Paso, near the Pecos and San Pedro Rivers, and 
along the middle course of the Rio Grande: var. a. south of the Rio 
Grande. Fl. July and August. — Plants from 4-2 feet high; the 
larger ones ovate ; areole distant ; spines very different in size, in the 
different varieties ; radial spines 1-34, central spines 14 — 64 inches 
long ; flowers 24 — 34 inches long; seeds similar to the last, but with 
much larger pits. 
§ 2. Cornigeri. 
A. Heteracanthi. 
9. E. Wistizeni, 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 14-3 inches long. Flowers 23 
inches long. 
10. E. Leconrer, 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- 
der, often quite clavate plant; larger specimens 3-4 feet high, and 
of only one third that diameter ; arrangement of spines similar, but 
generally 5 (not 3) radial spines below the lowest central one ;°¢en- 
tral spines more compressed, upper ones curved, lower one rarely 
somewhat hooked ; flower, fruit, and seed smaller ; <r more ob- 
long and pitted. 
