40 
CACTACEaE. 
apart, oblong, quite strongty pulvinate, 3 lines long, bearing slender brown bristles; spines in 
the specimens collected east of tbe Colorado sharply angular, pale straw colored or whitish, 
brownish only at the very base, 1—1| inch long; sterile fruit obovate-subglose, 1-lf inch long, 
with large pulvilli crowded toward the upper end of the fruit, covered with grayish-brown wool 
and bright brown bristles. The specimen from Cajon Pass has brighter colored spines, with 
the lower half red brown, not so angular; some erect spines, at the upper end of the joint, almost 
terete. On this specimen a ripe fruit was collected, from which the above description has been 
taken; it is If inch long, nearly one 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 10 along the rim; seeds 3 lines or more in diameter, much compressed, with the 
broad rim almost curled. Some of the seeds have germinated, and the young plants grow 
vigorously. 
This plant cannot be confounded with any others of one species ; some southern Opuntice have 
similar, or even more elongated joints, but are erect and almost unarmed, such as 0. structa, 
0. iulerculatus, 0. lanceolata, etc. 0. polyantha from South America, seems to be similar, but 
has smaller and more spiny joints, etc. 
7. Op. PHiEACANTHA, var. major E. in PI. Fendl. Mem. of American Acad. IV, page 52. 
Near Zuni.—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 0. Camanchica. 
Op. Mojavensis, E. & B. : prostrata, articulis grandibus suborbiculatus, pulvillis remotis, 
setis grandibus fulvis, aculeis 2-6 validis compressis acute angulatis elongatis plus minus cur- 
vatis, fuscis versus apicem pallidioribus annulatis, adjectis infra 1-3 minoribus tenuioribus 
pallidis ; bacca pulvillis 20-25 fusco-setosis stipata. (Plate IX, fig. 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 l-2f inches long, stout, bright-brown ; fruit If inch long, oblong ; pulvilli 
crowded towards the upper end. It is possibly a distinct species, but the material too incom¬ 
plete to permit us more than merely to indicate it. 
8. Op. Camanchica (sp. nov.): articulis adscendentibus majusculis obovato-orbiculatis pulvil¬ 
lis remotis orbiculato-ovatis tomentum griseum setasque paucas stramineas fulvasve (in pulvillis 
terminalibus demum elongatis rigidiores) gerentibus plerisque armatis ; aculeis 1-3 s. ad 
marginem pluribus compressis fuscis s. atro-fuscis versus apicem pallidioribus superioribus 
elongatis suberectis ceteris deflexis gracilioribus flore? Bacca ovata late umbilicata atro-rubente 
succosa pulvillis remotis obsoletis seminibus majusculis irregularibus angulatis late marginatis 
(Plate IX, fig. 1-5.) 
On the Llano Estacado, at the base of the hills, in rather fertile soil, from the easten slope of 
that elevated plain to the Tucumcari hills, near the upper course of the Canadian river. A 
large plant, spreading extensively, with large rounded joints 6-7 inches long by 54-7 wide ; 
pulvilli about If inch remote ; bristles dirty-yellowish, greenish or brown, inconspicuous,^ 
except at the upper edge, where they often become elongated and stouter ; only the lowest 
pulvilli are spineless, the others bear 2-3 and the marginal ones 3-6 spines ; larger ones lf-2 
and in some specimens almost 3 inches long. Flower unknown ; fruit very characteristic, dis¬ 
tinguishing this species from the nearly allied 0. phceacantlia. It is oval, not narrowed or 
constricted at base ; l|-2 inches long, 1-1 f inch in diameter, with a large flat umbilicus f-1 
inch in diameter, considerably resembling the fruit of 0. Engelmanni ; of a deep-red color and 
a very sweet juicy pulp. Seeds 2f—3 lines in diameter, very irregular, angular and often 
twisted, with sides impressed, mostly with a broad and thick acute or obtuse rim deeply notched 
at the hilum. 
