J 
fl. March and April. — Heads 5-10 inches high, 2| - 4 in diameter; 
upper radial spines lateral and lower ones f - 1 inch long; central 
spines hardly longer, or the lower sometimes - 2J inches long. 
Flowers 2-3 inches long, profusely covering the plant for four or 
six weeks. Seed the largest of any Echinocerei known to me, 0.8 
- 0.9 of a line long. 
20. C. Rcemeri, E. in PI. Lindh. 1850 : ovatus, csespitosus, lsete viri- 
dis ; costis 7-9 tuberculatis interruptis ; areolis orbiculatis, junioribus 
breviter tomentosis; aculeis teretibus robustis albidis seu junioribus 
flavidulis demum cinereis, radialibus sub-8, centrali singulo robustiore' 
porrecto ; floribus lateralibus infundibuliformibus limbo erectiusculo ; 
pulvillis ovarii tubique 16- 18 albo-tomentosig aculeolos 3-5 geren- 
tibus ; sepalis interioribus 7 -8 ovato-oblongis carinatis obtusis mu- 
cronatis; petalis 9-12 obovato-spathulatis obtusis integris concavis 
rigidis suberectis; stylo longe supra stamina albida sursum rosea ex- 
serto; stigmatibus 6-7 petala sequantibus erecto-patulis viridibus acu- 
tiuseulis. 
In the granitic region about the Llano River, Western Texas: fl. 
May : fruit unknown. — Often 5-12 from the same base, densely 
csespitose ; single heads 3-4 inches high, 2- 2^- in diameter ; areolae 
6 - 8 lines apart; radial spines 5-12 lines long, upper ones usually 
a little shorter than the rest; central spine 10- 15 lines long. Flower 
2 inches long and only one in diameter, remaining open day and 
night for a whole week, if the weather is not toe warm. — Allied to 
the last species ; but distinct by the shorter heads, fewer ribs, fewer 
and paler spines, and smaller flower, with less numerous parts. 
21. ? C. paucispintjs, E. in B. C. R.: ovato-cylindricus, parce ramo- 
sus vel simplex, 5-7-costatus ; areolis remotis ; aculeis robustis 3-6 
radiantibus fuscatis^, centrali nullo vel raro robusto subangulato. . 
Western Texas, from the San Pedro to the mouth of the Pecos. — 
Stem 5-9 inches high, 2 - 3 in diameter; spines 9-16 lines long, 
dark-colored, the central one almost always wanting. Flower and 
fruit unknown. 
22. ? C. hexaedrus, E. & B. in P. R. R.: ovatus subsimplex, 6- 
costatus ; areolis remotis; aculeis rectis rigidis tenuibus angulatis, ra¬ 
dialibus 5-7 flavo-rubellis, inferiore breviore, centrali paullo robusti¬ 
ore (juniore fuscato) ssepe deficiente. 
Near Zuni, in Western New Mexico. — Heads few in each pldnt, 
or single, 4-6 inches high, 2 -2£ inches in diameter. Radial spines 
