OF ARTS AND SCIENCES. 277 



depressus ; costis 13 - 27 acutis undulatis ; areolis cordatis ; aculeis 

 robustis annulatis, plus minus curvatis rubellis, radialibus 6-7 infimo 

 deficiente, centrali singulo robustiore compresso decurvato ; floribus 

 roseis dense lanatis ; petalis laciniatis aristatis ; bacca coccinea lana- 

 ta ; seminibus Isevibus lucidis. 



Southern Texas, and Northeastern Mexico, from the Colorado to 

 Saltillo ; not westward beyond the San Pedro River : fl. April and 

 May. — Heads 8-12 inches in diameter, flat, or very old ones some- 

 times globose ; spines from ^-2 inches long. Flowers about 2 inches 

 long. 



^ 3. Theloidei, Salm. 



18. E, BicoLOK, Gal., var. Schottii, E. in B. C. R. : ovatus ; costis 

 8 oblusis interruptis ; aculeis radialibus 15-17 rectis, summis 2-4 

 longioribus latioribus compressis, centralibus 4, summo latiore longi- 

 ore ; floribus majoribus purpureis. 



Mier, on the Rio Grande : fl. September. — Plant 4-6 inches high, 

 2-3 in diameter; upper radial spines about 1 inch, upper central 

 one 1| inches long ; lower radial and central spines reddish variegated. 

 Flower 2-3 inches long, bright purple or rose-colored, — Distin- 

 guished from the Mexican E. hicolor, principally by the larger num- 

 ber of radial spines, and the greater length of the upper central spine, 

 which is carinate underneath. 



§ 4. Intertexti. 



19. E. iNTERTEXTUs, E. in B. C. R. : minor, ovato-globosus ; cos- 

 tis 13 acutis interruptis ; tuberculis sulcatis ; aculeis rigidis rubellis 

 apice fuscatis, radialibus 16-25 arete adpressis, superioribus 5-9 

 tenuioribus subfasciculatis, infimo robusto brevi ; centralibus 4, superi- 

 oribus 3 radiales superiores excedentibus cum iis implicatis, inferiors 

 singulo abbreviato porrecto ; floribus parvis in vertice dense lanato 

 congestis roseis ; bacca vix squamata sicca ; seminibus lucidis sca- 

 phoideis. 



Var. /3. DASYACANTHUS, E. 1. c. : ovatus ; aculeis setaceis longiori- 

 bus purpureo-cfEsiis, radialibus patulis, centrali inferiore ceteris paullo 

 breviore. 



From El Paso to the Limpio, and southward to Chihuahua : var. /3. 

 more common about El Paso : fl. March and April. — Plant 1 to 4, 

 the var. /3. even 6 inches high, 1-3 in diameter; spines 2-6, cen- 

 tral ones 1-9 lines long, in /3. 6 - 8 and central spines 9-11 lines 

 long. Flower about 1 inch long. Fruit 4 lines in diameter. 



