OF ARTS AND SCIENCES. 



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20 cum superioribus 5-10 setaceis plerumque albidis ; centralium 

 3-5 superioribus 2 brevioribus purpurascentibus, inferioribus 1-3 

 longioribus deflexis albidis ; floribus in caule inferiors lateralibus e 

 flavo virescentibus minoribus ; baccis parvis ; seminibus tuberculato- 

 scrobiculatis. 



Common about El Paso: fl. April. — Stems 3-10 inches high, 

 1| - 2 inches in diameter ; radial spines 2-5, central ones 9 - 15, 

 lines long. Flowers very similar to those of the last species, but 

 seeds different. 



* * Flavijlori. 



3. C. DASYACANTHUS, E. in Wisl. Rep. : subcylindricus, simplex 

 vel e basi ramosus ; costis 16-21; areolis ovatis ; aculeis 20-30 

 patulis cinereis apice saepe rubellis, interioribus 3-8 pauUo robustio- 

 ribus deflexis ; floribus subterminalibus magnis ; bacca subglobosa ; 

 seminibus tuberculatis. 



Var. /3. MINOR : aculeis paucioribus ; bacca minore. 



Common about El Paso : fl. April. — Plant 5-12 inches high, 

 densely covered with numberless spines. Flowers 3 inches wide, yel- 

 low, an uncommon color in Cerei. Fruit an inch in diameter ; in 

 var. j3. only half as large. 



4. C. CTENOiDES, E. in B. C. E.. : subsimplex, ovatus, 15-costatus ; 

 areolis lanceolatis ; aculeis albidis, radialibus 14-20 pectinatis, cen- 

 tralibus 2-3 uniseriatis brevibus ; floribus magnis. 



Eagle Pass on the Rio Grande : fl. June. — Plant 2 -4 inches high, 

 thick in proportion ; spines 1-4 lines long. Flower large. — Simi- 

 lar to the last, but distinguished by the characters given, which, with 

 the exception of the yellow flower, bring it close to C. pectinatus. 



* * * Ruhriflori. 



5. C. PECTINATUS, E. (Echinocactus pectinatus, Sclieid.) : ovato- 

 cylindricus, 18 - 23-costatus ; areolis lanceolatis ; aculeis radialibus 

 16 - 20 subrecurvis pectinatis apice roseis, centralibus 2-5 brevissi- 

 mis uniseriatis; tubo floris purpurei pulvillis 60-70 aculeolos rigidos 

 10-15 gerentibus stipato. 



Var. jS. ? AEMATUS, Poselg. : costis 15 - 16 ; aculeis radialibus 

 16-20, centrali singulo cseteris longiore. 



Var. y. ? RiGiDissiMus, E. in B. C. R. : costis 20 -22; aculeis e 

 basi bulbosa subulatis rigidissimis albidis seu rubellis 15-22 centrali- 

 bus nuUis; florum subverticalium tubo pulvillis 80 - 100 dense stipato. 



