188 CACTACEA OF THE BOUNDARY. 
ones darker when young, but difference of shade soon lost. Upper central spine 8-10 lines long ; lateral ones usually 
14—22 lines in length, always exceeding the upper and lower one, —this last one is the sbdectent and broadest of all, 
9-14 lines long, mostly yellowish-brown, darker on the upper, lighter on the lower surface, and with the hook brown 
or black ; rarely 1 or 2 additional central spines are noticed. Flower 12-16 lines long, only 9 or 10 lines wide when 
fully open at noon ; petals 7-8 lines long, 2 lines wide, pale rose-colored, with a deeper colored midrib. Fruit and 
seed unknown. — Near the last species ; distinguished by the larger size, the very different root, the smaller number of 
radial spines, the shortness of the upper central spine, and the red color of the flowers. Other differences will no doubt 
be found in fruit and seed. Name from the shortness of the hook, by which the species is distinguished from most 
other allied forms. 
3. E. uncrnatus, Hepf., var.? Wricutir: glaucescens, ovatus ; costis 13 compressis tuberculatis supra usque 
ad basin sulcatis; areolis ovato-orbiculatis, pian albo-lanatis; aculeis radialibus 8, inferioribus 3 brevioribus 
teretibus uncinatis ureo-fuscis, ceteris 5 compressis rectis infra stramineis sursum rubellis apice fuscis, summis 
longioribus latioribusque, centrali singulo complanato basi angulato flexuoso elongato hamato erecto stramineo apice 
usco ; floribus ex areola penitus axillari ortis ; sepalis inferioribus 25-30 imbricatis squameformibus e basi longe 
auriculata triangularibus hyalinis, mediis 15-25 ovato-orbiculatis cordatis acutis purpurascentibus, anes s 18-20 
Sana as obtusis purpureo-fuscis, sepalis omnibus margine membranaceo albido ciliatis ; petalis 20-30 lineari- 
tis py acutiage purpureis, internis mucronatis denticulatis ; id. supra stamina numerosissima exserto 
Saal carneis suberectis; bacca ovata rubella ; seminibus curvatis oblique obovatis tuberculatis ; hilo circulari 
basi ee Tx LXXIV. fig. 10. 
Near El Paso, and on the river below; also at Eagle Springs, on stony hills and nearly to the top of the moun- 
tains, commonly in tufts of grass or hidden among low bushes: Wright, Bigelow. Flowers in March and April. — 
Oval, 3-6 inches high, 2~3} inches in diameter, with a long tuft of the whitish hooked central spines, which are at first 
difficult to distinguish from the surrounding bunches of dead grass. The adult plants have generally 3, very rarely 4, 
lower hooked radial spines, 3-1} inch long ; 5 lateral and upper radial spines, 1-14 inch long, paler and flattened, the 
uppermost one longer, broader, and whiter than the rest. Sometimes I find 6 upper spines, when the 3 outer and 
more slender ones appear radial, and the 3 inner and stouter ones assume the position of 3 upper central spines, — there 
are then 6 radial and 4 central spines ; the hooked central spine is 2-4 inches long, and not annulated. Young plants 
have 6-7 radial and 1 central spine, all terete and purplish, with darker tips, all $-1 inch long ; in older specimens 
the central spine elongates, and finally becomes flattened and whitish. Groove on the tubercles 2-3 lines long, 
so that the axillary flower is distant thus far from the spines. Flower 1-1} inch long, dark purplish-red, opening at 
midday in bright sunshine ; filaments at least 1000, yellow below, orange at tip. Frait ovate, 8-12 lines long, 
pulpy-red, setting off the white membranaceous sepaloid scales, Seed 0.7-0.8 line long, remarkably curved ad [21] 
contracted at the | base, rc rr (more so in the ventral curvature), carinate on the back, tuberculate ; the 
small circular hilum surrounded by a very tumid, smooth, and shining rim; albumen large ; embryo hooked, with 
foliaceous cotyledons. 
e Mexican E. uncinatus — of which I have seen spines and seeds collected by Dr. Poselger between Saltillo 
and San Luis Potosi, and flowers found ise _ pags near Parras — has 7-8 radial spines (the 3 lower ones of which 
are hooked) and 4 central ones, the low flattened and elongated ; lower’ sepals 36, upper ones about 14, 
oblanceolate, aristate, margined ; petals 25, 2 ead acuminate, aristate ; 8-10 stigmata. Seeds 0.6-0.7 line 
long, very much compressed, curved, almost cochleate, a pes and shining ; circular hilum almost eéitcndl albumen 
and embryo same as in the other. (Tab. LXXIV. fig. 
4, E. setisprnus, E. in Plant. Lindh. Many forms have been collected by the Commission, all characterized 
by 13 narrowly compressed ribs, slender flexible spines, small bright-red globose fruit, and globose-obovate oblique 
nae tuberculated seeds, with an almost circular basilar hilum. The heads are globose, or usually length hened and 
almost cylindrical when old, but sometimes depressed. Spines short or long, the central spine usually somew hat 
longer than the others, but in some specimens from the Rio Grande shorter ; in others from Eagle Pass much longer 
than the others, and erect, sometimes hardly curved. Seed usually 0.6 line long ; in the above-mentioned specimen 
from Eagle Pass 0.8 line in len 
The geographical range of this species is from the Brazos south to the Rio Grande — whence Berlandier has sent 
it under the name of Cactus bicolor — and west to near the San Pedro. (Tab. XX. 
5. E. srnvatus, Dietr. (E. setispinus, y sinuatus, Poselg.): globosus, lete viridis ; costis 13 obliquis compress!s 
acutatis interruptis ; tuberculis breviter sulcatis ; areolis orbiculatis, junioribus albo- seu griseo-villosis ; aculeis 
radialibus 8-12 setiformibus flexilibus, 3 inferioribus et 3 superioribus yureo-fuscis rectiusculis, lateralibus 
2-6 tenuioribus longioribus sepe compressis rufis seu interdum flexuosis hamatisve albidis ; aculeis centralibus 
4 quorum 3 superiores graciles compressi seu sub-angulati erecti pleramque recti, infimus latior compressus S° 
canaliculatus flexuosus elongatus stramineus basi purpurascens apice subhamatus ; floribus ab areola aculeifera paulo 
