SYNOPSIS OF THE CACTACEZ OF THE UNITED STATES. 139 
Rocky places on the Upper Pecos, and perhaps San Francisco mountains. — Heads 3-4 inches high, few, of un- 
equal height from one base; upper radial spines 2-5 lines, lateral ones 6-15 lines long; upper central spines hardly 
longer than the lateral ones; lower one 1-3 inches long, angular and often compressed. The Mexican C. acifer, Otto, 
seems sitilar, but is a higher plant, with much stouter spines. C. Remeri, Muhlenpf. A. G. Z. 1848, from Western 
Texas, may belong here or to C. enneacanthus. A specimen among Dr. Bigelow’s collections seems to unite this form 
with C. pheniceus, where for the present it is perhaps best to leave our plant as a variety or sub-species. 
19. C. ponyacantuHus, E. in Wisl. Rep.: ovato-cylindricus, cxespitosus, subglaucescens, 9-13-costatus; aculeis 
robustis rigidis rectis albidis seu rubello-cinereis, centralibus 3-4 bulbosio paullo robustioribus zequilongis seu longiori- 
bus, junioribus seepe fusco-variegatis ; stigmatibus 8. 
ommon about El Paso, and thence to the mountains of Chihuahua: flowers March and April.— Heads [285] 
5-10 inches high, 23-4 in diameter ; upper radial spines }, lateral and lower ones 3-1 inch long; central spines 
hardly longer, or the lower sometimes 14-2} inches long. Flowers 2~3 inches long, profusely covering the plant for 
four or six weeks. Seed the largest of any Echinoceret known to me, 0.8-0.9 of a line long. 
2 @MERI, E. in Pl. Lindh. 1850: ovatus, czespitosus, lete viridis ; costis 7-9 tuberculatis interruptis ; : 
areolis orbiculatis, junioribus breviter tomentosis ; aculeis teretibus robustis albidis seu junioribus flavidulis demum cine- 
reis, radialibus sub-8, centrali singulo robustiore porrecto ; floribus lateralibus infundibuliformibus limbo erectiusculo ; 
pulvillis ovarii tubique 16-18 albo-tomentosis aculeolos 3-5 gerentibus ; sepalis interioribus 7-8 ovato-oblongis carina- 
tis obtusis mucronatis ; petalis 9-12 obovato-spathulatis obtusis integris enemas rigidis suberectis ; stylo longe supra 
stamina albida sursum rosea exserto; stigmatibus 6-7 petala equantibus erecto- oabales viridibus acutiusculis. 
n the-granitic region about the Llano River, western Texas: flowers May: fruit unknown, — Often 5-12 from 
the same base, densely cxspitose; single heads 3-4 inches high, 2-2} in diameter; areole 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 too warm. — Alli 
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. paucispinus, E. in B. C. R.: ovato-cylindricus, parce ramosus vel simplex, 5—7-costatus ; areolis remotis ; 
aculeis sana 3-6 radiantibus fuscatis, centrali nullo vel raro robusto subangulato. 
from the San Pedro to the mouth of the Pecos. — Stem 5-9 inches high, 2-3 in diameter; spines 
9-16 saa ae Ragen the central one almost always wanting. Flower and fruit unknown. 
22.? C. HExaprus, E. & B. in P. R. R. : ovatus subsimplex, 6-c us ; areolis remotis ; aculeis rectis rigidis 
tenuibus angulatis, radialibus 5-7 havrubelli inferiore breviore, nar paullo robustiore (juniore fuscato) seepe 
deficiente. 
i, in Western. New Mexico. — Heads few in each plant, or single, 4-6 inches high, 2-23 ir 
in diameter. ” Radial spines mostly 6 lines, lower ones 6-10 lines, upper ones 8-15 lines long ; central Oo of [286] 
present, 12-15 lines long. 
§ 3. PENTALOPHI. 
. C. BeriaAnvieri, E.in B.C. R.: humilis, perviridis ; caule diffuso subtereti articulato ramosissimo ; tuber- 
eulis conicis 5-6-fariis ; aculeis 6-8 setaceis brevibus radiantibus albidis, centrali singulo multo longiore fusco; flori- 
bus magnis; petalis angustis recurvatis ; seminibus tuberculatis. 
On the Nueces, in southern Texas: flowers May and June. — Stems 14-6 inches long, one inch thick; redial 
spines 4-5 lines long, central one 6-12 lines long, toward the base of the branches shorter. Flower 2-4 inches long. 
24. C. procumsens, E. in Pl. Lindh. 1850 : humilis, perviridis ; caule diffuso subtereti 4-5-angulato articulato 
ramosissimo ; aculeis 4-6 radiantibus albidis, eatiell nullo vel singulo paullo longiore obscuro; Soxibes magnis ; petalis 
obovato-spathulatis patulis seu subrecurvis ; seminibus tenuissime verrucosis. 
On the Rio Grande, below Matamoras: flowers May and June. — Similar to the last; but more slender, 6-8 lines 
in diameter ; radial spines 1-2 lines long, central one, if present, 2-3 lines long. Flower above 3 inches long. 
§ 4. GRacILEs. 
. C. TUBEROsUS, Poselger : e radice tuberosa tenuissimus, teres, sursum incrassatus, demum articulatus, 8-cos- 
tatus ; a minutis setaceis, 9-12 radiantibus, centrali singulo longiore sursum adpresso ; flore subterminali ; semi- 
nibus =a scrobiculatis 
een Laredo and Mier on the Rio Grande. Tuberous root 4-14 inches thick. Stem above 4-8 lines thick ; 
mee spin hardly 1 line, central ones 2-3 lines long. Seed smaller than in any other Echinocereus, 0.4 line long, 
with the tubercles confluent. 
ie en. 2. Evcrreocs. Caulis elongatus: fasciculi aculeorum steriles et florigeri nt floris tubus elon- 
gatus, sepissime aculeolis capillaceis munitus ; stigmata pallida; semina levia seu raro rugosa : tus. 
