WOOTON AND STANDLEY—FLORA OF NEW MEXICO, 455 
Spines 3 to 6, mostly 3, shorter and not so stout. 9. E. triglochidiatus, 
Spines more slender though rigid, mostly terete, 
more numerous in the areole (except in E. 
paucispinus). 
Centrals none or sometimes 1; radials 3 to 6; . 
spines all terete or but slightly flattened, 
stout for the group.........-------------10. E. paucispinus. 
Centrals 1 to several, mostly 3 to 5 or 6; radials 
8 to 16, mostly 10 to 13; spines often flat- 
tened or angled. 
Centrals mostly 6; flowers small, the petals 
UCULC. 0... eee eee eee eee eee 11. E. neomexicanus. 
Centrals 3 to 5, mostly 4; flowers larger; 
petals obtuse. 
Centrals stout, terete, usually gray or 
pinkish gray when young, dark 
eray in age, 15 to 20 mm. long.. 12. E. roset. 
Centrals more slender, yellowish to 
gray or darker. 
Spines short, mostly yellowish; 
centrals 14 to 40 mm. long, 
mostly about 25 mm.; plants 
rounded or somewhat de- 
pressed at the apex......-- 13. E. coccineus. 
Spines much longer, mostly dark, 
the centrals 25 to 80 mm. 
long, commonly about 50 
mm.; plants conic at the 
APCX. 22. ee eeeee eee eee eee 14. E. conoideus. 
Echinocereus hexaedrus (Engelm.) Riimpl. from near Zuni, known only from the 
type locality, is probably only a form of EF. gonacanthus, orginally from the same 
region, where it is fairly common. What the plant may be which Doctor Coulter 
refers to E. octacanthus (Fendler’s 272, in part, from Santa Fe) we are unable to say, 
but it is likely to be either a form of FE. paucispinus or an aberrant £. coccineus. 
Schumann is certainly incorrect in reducing EZ. gonacanthus and E. triglochidiatus to 
E. paucispinus; the two angular-spined species may be the same, although this is 
doubtful, but E. paucispinus is more closely related to the E. polyacanthus group, not- 
withstanding its few spines. 
1. Echinocereus chloranthus (Engelm.) Riimpl. in Férst. Handb. Cact. ed. 2. 
814. 1886. 
Cereus chloranthus Engelm. Proc. Amer. Acad. 8: 278, 1856. 
Type LocALity: ‘Stony hills and mountain sides near El Paso.” 
Rance: Southern New Mexico, trans-Pecos Texas, and adjacent Mexico. 
New Mexico: Tortugas Mountain; Organ Mountains; San Mateo Peak; Queen; 
Cooks Peak; Rincon; Lake Valley. Limestone hills, in the Lower Sonoran Zone. 
2. Echinocereus viridiflorus Engelm. in Wishiz. Mem. North. Mex. 7. 1848. 
Cereus viridiflorus Engelm. in A. Gray, Mem. Amer. Acad. n. ser. 4: 50. 1849. 
TypE LOCALITY: Prairies on Wolf Creek, New Mexico. Type collected by Wislize- 
nus in 1846. 
Rance: Southern Wyoming to New Mexico and western Texas. 
New Mexico: Pecos; Colfax; west of Santa Fe; Organ Mountains; White Moun- 
tains; Sierra Grande; Nara Visa. Upper Sonoran Zone. 
