WOOTON AND STANDLEY——FLORA OF NEW MEXICO, 447 
31. Opuntia filipendula Engelm. Proc. Amer. Acad. 3: 294. 1856. 
Opuntia ballit Rose, Contr. U. 8. Nat. Herb. 13: 309. 1911. 
Tyre Locauity: ‘‘Alluvial bottoms of the Rio Grande near El Paso, and eastward 
on the Pecos,’’ Texas, 
Rance: Western Texas and southern New Mexico. 
New Mexico: Knowles; Redlands; Queen; Lakewood; Jornadadel 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. P cyclodes Engelm. & Bigel. Proc. Amer. Acad. 3: 291. 1856. 
Type Locauity: ‘‘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.' 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 acombination. The region contains two, and possibly three, 
species of Cylindropuntiae with such fruit. It seems best to omit the name from our 
list until itis 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 O. 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.? and Opuntia microcarpa Engelm.,? both of 
which came from New Mexico, are uncertain. The latter was described only froma 
pencil drawing. 
2. MAMILLARIA Haw. PINcusHION CACTUS. 
Mostly small, solitary, proliferous or cespitose, globose to short-cylindric planta 
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 numercus small white spines. 
Spines glabrous; plants depressed to umbilicate at the 
apex; spines of the upper tubercles often elon- 
pated... cece cece cece cece cece eee e cece eee e ee eee 1. M. micromeris. 
Spines pubescent; plants oval, rarely cespitose; upper 
spines.not elongated.........--.----..-e--20-e eee 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. 1856. 
2 Proc. Amer. Acad. 3: 296. 1856. 
3 In Emory, Mil. Reconn. 157. /. 7. 1848. 
