284 PROCEEDINGS OF THE AMERICAN ACADEMY 



gulatis compressis rectis seu curvatis laxe radiantibus ; floris coccinei 

 staminibus petala obtusa subsequanlibus ; stigmatibus 8 - 10. 



Northern New Mexico, at Santa Fe, and to the east and westward : 

 fl. June. — Stems 4-6 inches high, 2-3 in diameter, with sharp 

 ridges and very shallow grooves; spines 6-15 lines long. Flower 

 2-3 inches long ; petals rigid. Fruit unknown. 



18. C. PHCENicEUS, E. in P. R. R. (C, coccineus, E. in Wish Rep. 

 non Sahn.) : ovatus seu subglobosus, obtusus, ccespitosus, 9— 11-cos- 

 tatus ; areolis ovato-orbiculatis subconfertis ; aculeis setaceis rectis, 

 radialibus 8-12 albidis, superioribus cseteris pauUo brevioribus, cen- 

 tralibus 1-3 basi bulbosis teretibus paullo robustioribus ; staminibus 

 petalis brevioribus ; stigmatibus 6-8. 



Northern New Mexico, from the Upper Pecos to Santa Fe, Zuni, 

 and the San Francisco mountains : fl. May and June. — Heads 2-3 

 inches high, 2 inches thick, generally forming dense hemispherical 

 masses, often of a foot or more in diameter ; radial spines 3-6, 

 central ones 5-10 lines long. When there are several, the lowest one 

 longest. Fruit unknown. 



C. CONOIDEUS, E. & B. 1. c. : ovatus, versus apicem acutatus, co- 

 noideus, e basi parce ramosus 9-11 costatus ; aculeis radialibus 

 10-12 gracilibus rigidis, summis brevioribus, centralium 3-5 in- 

 fimo 4-angulato elongato demum deflexo. 



Rocky places on the Upper Pecos, and perhaps San Francisco 

 mountains. — Heads 3-4 inches high, few, of unequal 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 similar, but is a higher plant, with much stouter 

 spines. C. Rcemeri, 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. plixniceus^ 

 where for the present it is perhaps best to leave our plant, as a variety 

 or sub-species. 



19. C. poLYACANTHUS, E. in Wish Rep. : ovato-cylindricus, crespi- 

 tosus, subglaucescens, 9-13 costatus ; aculeis robustis rigidis rectis 

 albidis seu rubello-cinereis, centralibus 3-4bulbosio paullo robusti- 

 oribus Ecquilongis seu longioribus, junioribus ssepe fusco-variegatis ; 

 stigmatibus 8. 



Common about El Paso, and thence to the mountains of Chihuahua: 



