WOOTON AND STANDLEY FLORA OF NEW MEXICO. 447 



31. Opuntia filipendula Engelm. Proc. Amer. Acad. 3: 294. 1856. 

 Opuntia ballii Rose, Contr. U. S. Nat. Herb. 13: 309. 1911. 



Type locality: "Alluvial bottoms of the Rio Grande near El Paso, and eastward 

 on the Pecos," Texas. 



Range: Western Texas and southern New Mexico. 



New Mexico: Knowles; Redlands; Queen; Lakewood; Jornada del Muerto ; Lower 

 and Upper Sonoran zones. 



Doctor Griffiths reports having seen this about Alamogordo. 



32. Opuntia cyclodes (Engelm. & Bigel.) Rose, Contr. U. S. Nat. Herb. 13: 309. 

 1911. 



Opuntia engelmanni var. ? cyclodes Engelm. & Bigel. Proc. Amer. Acad. 3: 291. 1856. 



Type locality: "On the upper Pecos, in New Mexico." The type was collected 

 about the mouth of the Gallinas River, near Anton Chico. 



Range: Known only from the vicinity of the type locality, in the Upper Sonoran 

 Zone. 



What Opuntia angustata Engelm. 1 from Zuni may be, we are unable to determine. 

 Britton and Rose are of the opinion that there is some mixture passing under this 

 name, and Doctor Engelmann's description and illustrations suggest this possibility, 

 for a tuberculate fruit of the character drawn is an anomaly when attached to a flat- 

 jointed Opuntia, although of course such a thing might exist. So far, however 

 we have never seen such a combination. The region contains two, and possibly three 

 species of Cylindropuntiae with such fruit. It seems best to omit the name from our 

 list until it is better known. As figured and described, the joints are narrowly obovate 

 15 to 25 cm. long and half to two-thirds as wide, with yellowish or whitish spines much 

 like those of 0. engelmanni. The plant is prostrate; the flower is not known. One of 

 the spiny fruits figured suggests those of Opuntia polyacantha, somewhat enlarged; 

 the other looks like that of Opuntia arborescens. 



Opuntia cymochila montana Engelm. 3 and Opuntia microcarpa Engelm.,' both of 

 which came from New Mexico, are uncertain. The latter was described only from a 

 pencil drawing. 



2. MAMILLARIA Haw. Pincushion cactus. 



Mostly small, solitary, proliferous or cespitose, globose to short-cyUndric plants 

 with spines borne on the ends of conic teatlike tubercles; flowers borne in the axils 

 of the tubercles; ovary smooth; fruit neither scaly nor spiny; seeds smooth or pitted. 



KEY TO THE SPECIES. 



Tubercles not grooved on the upper side; spines sometimes hooked. 

 Central spines wanting; plants small, 3 to 5 cm. high, with 

 very numerous small white spines. 

 Spines glabrous; plants depressed to umbilicate at the 

 apex; spines of the upper tubercles often elon- 

 gated 1 . M '. in icrmturit. 



Spines pubescent; plants oval, rarely cespitose; upper 



spines not elongated 2. M. lasiacantha. 



Central spines present, 1 or more; plants larger. 



At least one of the central spines hooked; plants small, 

 globose or oval, not flat-topped; spines all slender, 

 the radials white, numerous, the centrals dark- 

 colored, brown or black. 



1 Proc. Amer. Acad. 3: 292. 1866. 

 a Proc. Amer. Acad. 3: 296. i- 



8 In Emory, Mil. Reconn. 157./. 7. 1848. 



