WOOTON AND STANDLEY — FLORA OF XEW 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 



acute 11. E. neomexicanus. 



Centrals 3 to 5, mostly 4; flowers larger; 

 petals obtuse. 

 Centrals stout, terete, usually gray or 

 pinkish gray when young, dark 



in age, 15 to 20 mm. long.. 12. E. rosei. 



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 

 apex 14. E. conoideus. 



Echinocereus hexaedrus (Engelm.) Rumpl. from near Zuni, known only from the 

 type locality, is probably only a form of E. 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 E. paucispinus or an aberrant E. coccii 

 Schumann is certainl) incorrect in reducing E. gonacanthus and /■.'. triglochidiatus to 

 /■;. paucispinus; the two angular-spined species may be the same, although this is 

 doubtful, hut /■.'. paucispinus is more closely related to the E, polyacanthus group, not- 

 withstanding its few spines. 



1. Echinocereus chloranthus (Engelm.) Rumpl. in Forst. Bandb. Cact. ed. 2. 



814. 1886. 

 Cereus chloranthus Engelm. Proc. A.mer. Acad. 3: 278. 1856. 

 Type locautt: "Stony hills and mountain sides near El Paso." 

 Range: Southern New Mexico, trans- Pecos Texas, ami adjacenl Mexico. 

 New Mexico: Tortugae Mountain; Oi □ Mountains; San Mateo Peak; Queen; 

 ('(inks Peak; Rincon; Lake Valley. Limestone hills, in the Lower Sonoran /. 



2. Echinocereus viridifiorus Engelm. in Wisliz. Mem. North. Mex i 18 

 - i us viridifiorus Engelm. in A. Gray, Mem. Amer. Acad. n. ser. 4: ■'><>. I 

 Type looautt: Prairies on Wolf Creek, New Mexico. Type collected byWiali 



nil- in L8 16. 



Rangi : Southern Wyoming to New Mexico and we tarn T( 

 \i;u Mexico: Pe< i [fax; weal of Santa Fe Organ Mountains; White Moun- 

 tains; Sierra Grande; Nana Visa, l pper Sonoran Zone 



