CACTACE OF WHIPPLE’S EXPEDITION. 169 
numerous slender radiating spines, and always has spiny fruits— that we feel obliged to sic this plant as a 
distinct species. The seeds brought home by the expedition have germinated, and are growing vigorously. 
15. O. ERINACEA, sp. nov.: diffusa, adscendens ; articulis tumidis ovatis s, teretiusculis, pulvillis confertissimis 
ovato-orbiculatis albo- eee demum stramineo-setosis omnibus armatis; aculeis 3-5 gracilibus elongatis e 
cinereo-rubellis 1-3 superioribus brevioribus sursum porrectis, centrali longiore patulo vel declinato, ceteris deflexis, 
additis 2-4 minoribus inferioribus ; bacca ovata umbilico infundibuliformi pulvillis 30-40 setas stramineas et aculeolos 
12-20 gerentibus ; seminibus magnis subregularibus late acuteque marginatis, (Plate XIII. figs. 8-11.) 
West of the great Colorado, near the Mojave Creek. Joints 2-2} inches long, 1-1} inches wide, and about 
4-3 inch thick, sometimes elongated, almost cylindric, densely covered with the lange ‘wile pulvilli, which are only 
2-3 lines apart, and numerous roddinh-ctily spines with red points bristling hadsohupclike (whence the specific name) 
in every direction. Spines 6-14 or in old joints even 20 lines long, with smaller ones very slender, flexible, but stiff. 
Young plants cylindric, covered with bunches of 15 or 20 or more white hair-like spines. Bristles dirty-yellow, even 
in young joints ° in old ones densely crowded and 2-3 lines long; in a dead flower a 6-parted stigma was 
noticed. Fruit 1-1} inches long, about } an inch in diameter, with a deep funnel-shaped umbilicus; pulvilli 
crowded, prominent, white-tomentose with yellowish ee and numerous, mostly deflexed spines, 3-6 lines long. 
Seed nearly 3 lines in diameter, much compressed, more regular than in the three foregoing species. 
Pp 
ee 
16. O. BRACHYARTHRA, sp. nov.: prostrata s, adscendens, articulis ovatis s. orbiculatis tumidis seepe sub- 
giohoeite tuberculatis ; pulvillis eaaieaisn: magnis vere parce setulosis plerisque armatis ; aculeis 3-5 sero 
s. fuscatis patulis ; 1-2 validioribus sursum versis, ceteris minoribus minimisque subdeflexis ; floris parvi; ovario 
subgloboso, pulvillos 12-15 — setosos euperiores aculeolatos gerante, sepalis tubi pS ee hae 
geen stigmatibus 5. (Plate XII. fig. 
e foot of the Inscription Rock 1 near Zuni, under pine-trees; only seen in that single locality. 
A singin WsGhcng plant, with short tumid joints (10-15 lines long, 10-12 wide and nearly the same in thick- [48] 
ness), one growing on the top of the other, so as to resemble somewhat a jointed finger. In the absence of 
ripe fruit we are unable with certainty to class this species. The shape of the joints and the somewhat spinulose 
fruit seem to bring it very near to 0. fragilis, and it may possibly be a small and compact form of this species, 
though the appearance is very different ; on the other hand, the subglobose joints seem to refer it to the section 
Glomerate, Salm. 
villi 2-4 lines apart, large, white or when old grayish tomentose, with very few short yellowish bristles, even 
in the old joints ; spines 9-12 lines long, rather stout, terete, often with 1 or 2 short ones not more than 1-2 lines i 
No ripe fruit was found (November), — which is also often the case with 0. fragilis, — but many remains of flow 
with globose-ovate fleshy sterile red ovaries, 3-4 lines long, some of them becoming larger and probably proliferoas ; 
generally only some of the upper pulvilli bear a few short spines. The flower seems to have been about 1 inch in 
diameter, with about 5 sepals, 8 or 9 petals, and style with 5 stigmata. 
Lis, Haw., — the seed of which we give a figure of (Pl. XXIV. fig. 5), — grows on the upper Missouri 
and Yellowstone, and pcobalily down to Santa Fé. The joints are small, ovate, c conipreiied or turned, or even terete ; 
4 larger spines on the upper fully developed pulvilli cruciate, the upper one suberect, stouter and longer than the 
others, mostly yellowish-brown ; on the lower margin 4-6 small white radiating spines ; bristles few. Fruit appar- 
ently somewhat fleshy, getting dry much later, with 20-28 pulvilli, almost naked, only the upper ones with a few 
short spines. Seeds few, large, re 
Subgen. 2. CyziinpRopuntta, Engelm. 
§ 1. Clavate. 
17. O. cLhavata, E. in Wisliz. Rep. (Pl. XXII. fig. 1-3). shen: cer Santa Fé to Albuquerque, — where 
Wislizenus and Fendler had already collected it, and nowhere else arkable and well-characterized species, 
the type of this section. We add to the characters previously ance (Wislizenus s Report, note 12, and Plante 
Fendleriane in Mem. Amer. Acad. Vol. IV. p. 49), that the leaves are long and subulate, 2-2} lines long; the 
broadest spines were 14 lines wide ; fruit 13-1} inch long, lemon-yellow, almost covered with 30-50 hemispherical 
pulvilli, which bear innumerable white ne so peeatix g ray-like in every direction. Seeds large for this 
section, and, as in all the allied species, transverse or broader than high, 2}-3 lines in the longest diameters, rostrate, 
somewhat angular; commissure Cwhiich in the indise and clavate opuntiz replaces the rim of the flat-jointed ones), 
impressed, linear or a little wider ; cotyledons, in several seeds examined by me, oblique. 
18. O. Parryt, E. in Sillim. Journ. Nov. 1852: articulis ovatis basi clavatis, tuberculis oblongo-elongatis 
pulvillis slbo-tenpenteadl setas paucas rigidas gerentibus; aculeis angulatis scabris rubello-ctnereis, interioribus vali- 
. dioribus sub-4 t triangulato-compressis, exterioribus 5-8 — supra infraque divergentibus, extimis 6-10 gracilibus 
