47 
scabrellis, interioribus 4-—'7 complanatis, inferioribus deflexis latioribus 
supra striatis subtus carinatis, superiore triangulato erecto; aculeis 
exterioribus 8—10 gracilioribus undique radiantibus ; bacee pulvillis 
setosissimis ; seminibus rostratis. 
Santa Fé and Albuquerque, on the plateaux: fl. in June and July. 
— Dense spreading masses, with joints 11-2 inches long; tubercles 
6-8 lines long ; larger spines 6 — 15 lines long, and the broadest one 
- 2-13 lines wide. Flower 2 inches in diameter. Fruit yellow, 13 - 
12 inches long, an inch in diameter, covered with 30-50 large pul- 
villi. Seed 24-3 lines in the longest diameter. Cotyledons mostly 
oblique, or, as in most other Opuntia, incumbent. (The expression is 
not etymologically correct, but I use it to designate the direction of the 
face of the cotyledons towards the radicle.) 
30. O. Parry, E. in Sillim. Journ. 1852: prostrata ; articulis ova- 
tis basi clavatis ; tuberculis oblongo-elongatis; setis paucis ; aculeis 
angulatis scabris rubellis demum cinereis, interioribus sub-4 validi- 
oribus compressis, exterioribus 4—8 divergentibus, extimis 6-10 
gracilibus radiantibus ; bacca ovata pulvillis sub-40 setosissimis stipa- 
ta ; seminibus erostratis. ; 
On the Mojave, west of the great Colorado. — Joints 24-3 or 4 
inches long, attenuated below and somewhat so above; tubercles 9 
lines long ; inner spines 12-16 lines long, and the larger ones some- 
what flattened, but less than a line wide; exterior spines 3-8 lines 
long, in two series. Fruit 14 inches long. Seeds about 2 lines in 
diameter. — The original specimens of Dr. Parry were found farther 
south, near San Felipe. He describes the joints as 4 — 8 inches long, 
with shorter whitish spines or tubercles 6 ~— 12 lines long, and the 
flower as greenish-yellow. The Mojave plant is nearly allied to the 
last species, but may be distinguished by the shape of the joints, the 
narrower, darker-colored, more numerous spines, and the smaller and 
more regular seeds. 
. 31. O. Emory:, E. in B. C. R.: articulis cylindricis basi clavatis 
glaucis ; tuberculis oblongo-linearibus elongatis; setis paucis; aculeis 
plurimis rufis, interioribus 5-9 validioribus triangulatis, compressis, 
exterioribus 10-20 pluriseriatis undique radiantibus ; floribus flavis 
extus rubellis ; bacca pulvillos 35—50 setosissimos inferiores aculeo- 
latos gerentibus ; seminibus valde inzequalibus irregularibus. 
Arid soil, from El Paso through Sonora to the desert of the Colo- 
rado: fl. August and September. — The stoutest species of this sec- 
