CACTACEZ OF WHIPPLE’S EXPEDITION. 163 
Joints 8-10 inches long by 6-8 wide, always of a very pale glaucous, or rather more yellowish-green color, which 
is strikingly characteristic, even at a distance, and which has procured our name for the plant ; pulvilli about 1 inch 
apart, strongly pulvinate. Bristles twofold and distinct, the upper and outer, and by far the most numerous ones are 
shorter and thinner, and cover the upper semi-lunar area of the areola; inside of them is a semicircular row of 
stouter and longer bristles, 4-6 lines long, which unite with the outer and shorter spiues of the outer and lower 
margin of the areola. This arrangement is most distinct on the upper and more fully developed pulvilli ; among 
our Opuntie@ it is only seen again, as far as known, in the obscure O. dulcis from Presidio del Norte. Spines 
proper 1-1} inches long, pale straw color, with faint transverse markings, hardly darker at base; shorter spines 
4-9 lines long. 
The description of the flower was drawn from an old withered specimen gathered in winter. It seems pale 
yellow, between 2 and 3 inches in diameter ; sepals and petals remarkably narrow, the latter about 1 inch long, and 
not half as wide. The ovary and fruit (all the specimens found were sterile) are quite tuberculous; pulvilli crowded, 
bearing brown wool and short yellow bristles. Specimens of sterile fruit seen 1j-14 inches long. 
O. PROCUMBENS, sp. nov.: prostrata, articulis orbiculato-obovatis grandibus pallide viridibus, pulvillis 
remotissimus griseo-tomentosis, actia flavis robustis valde inequalibus, aculeis validis 2-4 subinde (in articulis 
vetustioribus ?) 7-9 we angulatis inequalibus, stramineis s. pallidioribus versus basin obscurioribus, seepe rufis 
— nied a (Plate gs. 4-5, 
e San ae mountains to the Cactus Pass, at the head of Williams’s River, in rocky localities. 
Joints aa pai long, 7-9 broad, prostrate, always on edge; pulvilli 1j-2 inches apart; bristles 2-4 lines long, | 
comparatively stout ; spines 1-2 inches long. No flower or fruit seen. Very similar to O. Engelmanni, but prostrate, 
with even more distinct pulvilli, and stouter and often more numerous spines. 
O. anaustara, E. & B.: prostrata s. adscendens, articulis elongato-obovatis versus basin sensim angustatis 
eet ; pulvillis remotis griseo-tomentosis, setis fulvis gracilibus ; aculeis paucis (2-3) validis compressis albidis 
mineis, versus basin rufis s. fulvis, adjectis seepe infra 1-2 debilioribus omnibus deflexis ; bacca obovata, 
‘ihertulate rubella, late profundeque umbilicata pulvillis 24 stipata seminibus magnis siitistiacciniocs late marginatis. 
(Plate VII. figs. 3-4 
From the foot af the ae Rock, near Zuiii, to Williams’ s River, and westward as far as the Cajon Pass of 
the California mountains. Pros in the first and last Se localities, but sub-erect in the bottoms of 
Williams’s River. Joints 6-10 pater long, and at the upper third 3-4 inches wide, gradually narrowed 
downwards, rounded above ; ; pulvilli over 1 inch apart, oblong, iad strongly pulvinate, 3 lines long, — [40] 
slender brown bristles ; spines in the specimens collected east of the Colorado sharply angular, pale s 
colored or whitish, brownish only at the very base, 1-14 inch long; sterile fruit obovate-subglobose, 1- Bs ack long, 
with large pulvilli crowded toward the upper end of the fruit, covered with grayish-brown wool and bright ions 
bristles. The specimen from Cajon Pass has brighter colored s eg with the lower half red-brown, not so angular ; 
some erect spines, at the upper end of the joint, almost ter On this speciinen a ripe fruit was collected, from 
which the above description has been taken. It is 14 inch 3 g, nearly 1 inch in diameter, with the wide and flat 
umbilicus immersed about half an inch ; pulvilli on tubercular elevations about 14 on the upper part of the fruit and 
” along the rim ; seeds 3 lines or more in diameter, much compressed, with the broad rim almost curled. Some of 
e seeds have germinated, and the young plants grow vigorously. 
This plant cannot be confounded with any other single species. poms lin a8 Opuntie have similar or even 
more elongated joints, but are erect and almost unarmed, such as QO. structa, Q. tuberculata, O. lanceolata, ete. 
O. polyantha, from South America, seems to be similar, but has smaller sin more spiny joints, ete. 
7. O. PH@HACANTHA, var. MAJOR, E. in Plant. Fendl. Mem. American Acad. IV. p. 52. 
Near Zuiii.— As both Mr. Fendler and ourselves failed to collect the fruits of this form, it remains doubtful 
whether it has been justly referred here, or whether it is more closely allied to O, Camanchica. 
O. Mosavensis, E. & B.: prostrata, articulis grandibus pitta pulvillis remotis, setis grandibus 
fulvis, aculeis 2-6 validis compressis acute angulatis elongatis plus minus curvatis, fuscis versus apicem orgie 
annulatis, adjectis infra 1-3 minoribus tenuioribus pallidis ; bacca pulvillis 20-85 fusco-setosis stipata. (Pla 
- 6-8 
On Mojave Creek. At the time it was considered identical with the following species, and no further notice 
taken of it; only a few fragments were brought home, together with a sterile fruit. Spines 1-2} inches long, stout, 
bright brown ; fruit 13 inch long, oblong; pulvilli crowded toward the upper end. It is possibly a distinct species, 
but the material too incomplete to permit us more than merely to indicate it. 
. O. CAMANCHICA, sp. nov.: articulis adscendentibus majusculis obovato-orbiculatis pulvillis remotis orbiculato- 
at tonieiiain griseum setasque paucas stramineas fulvasve (in pulvillis terminalibus demum elongatis rigidiores) 
