CACTACE®. 33 
bulbosa compressis, superioribus tenuioribus brevioribus, inferioribus longioribus, centralibus 
5-7 bulbosis, quorum superiores radialibus vix longiores, 1-3 inferiores elongati divaricati 
deflexi sepe flexuosi. (Tab. XLY.) 
Mountains about Santa Rosa, in Coahuila, Bigelow.—Stems simple, or somewhat branching 
at base, 2-3 inches in diameter, 6-9 inches high; ribs fewer, more distinctly tuberculated, 
and less compressed than in most other species, and easily distinguished thereby. and by the 
orbicular areole, from the otherwise similar-looking, pale-spined forms of 0. chloranthus. Upper 
radial spines 24-3 lines, lowest and lateral ones 6-7 lines long ; upper central spines hardly 
longer than these ; lower central ones always 3 in well-developed plants, 14-2 or even 2} inches 
long. Flower and fruit of this peculiar and pretty plant as yet unknown ; the former said to 
be red. Name from the length and slenderness of the spines. 
8. C. Rerrerr, (sp. nov.): ovato-cylindricus ; costis 10-13 interruptis ; areolis ovato-orbi- 
culatis subconfertis ; aculeis e basi bulbosa subulatis rubellis apice obscuris demum cinereis, 
exterioribus 8-15 additis sepe supra aculeis centralibus, lateralibus longioribus, infimo 
singulo breviore ; aculeis centralibus 2-5 robustioribus plerumque sub-brevioribus ; floribus 
sub vertice lateralibus magnis purpureis; ovarii pulvillis 20-24 aculeolos 10-15 albidos fus- 
catosve gerentibus; sepalis tubi inferioribus aculeoligeris sub-15 triangulari-lanceolatis, 
superioribus 8-10 oblanceolatis spathulatis ; petalis 8-12 spathulatis; tubo intus basi nudo ; 
stigmatibus 10-12 viridibus suberectiq stamina numerosissima brevia longe superantibus ; 
bacca subglobosa ; seminibus oblique obovatis compressis inequaliter tuberculatis subscrobicu- 
latisque, hilo basilari parvo oblongo. (Tab. XLI, fig.3-5.) 
Sand-hills south of El Paso, Bigelow; near El Paso or Frontera, Wright: fl. April.—A 
single living specimen, preserved in the Congressional Garden in Washington, is 5 inches high 
and 24 in diameter, and has 12 ribs; areole in this and the dried specimens are 4-6 lines 
apart ; lower lateral spines 5-7 or 8 lines long, lowest one a little shorter, upper ones 2-3 
lines in length; central spines usually only 4—6 lines long, rarely one or the other longer ; 
always stouter than the others, and with very thick and bulbous bases. Flowers 23-3 inches 
long, purple, very similar to the flower of C. Fendleri or C. enneacanthus ; fruit 8-10 lines 
long, and rather less in diameter ; seeds 0.7 line long, strongly but irregularly tuberculated ; 
tubercles here and there somewhat confluent. In the arrangement of its spines this species 
considerably resembles C. dasyacanthus, and I have formerly taken it for a smaller variety of — 
that species ; but it differs from it by the smaller number of ribs, the fewer and stouter spines, 
which place it almost intermediate between the Pectinati and the Decalophi, the red flower, the 
small fruit, and the larger and irregularly tuberculated seed. I take great pleasure to ac- 
knowledge my indebtedness to the modest and faithful artist, Mr. Paulus Retter, who has 
adorned this memoir by his skillful pencil, by naming this species after him. 
9. O. Fexpiert, E. in Pl. Fendl.: simplex, seu parce e basi ramosus, ovatus seu ovato-cylin- 
dricus, perviridis; costis 9-12 rectis seu obliquis tuberculato-interruptis ; areolis orbiculatis, 
junioribus dense tomentosis subconfertis; aculeis basi bulbosis, radialibus 7-10 rectis seu sepe 
curvatis, inferioribus robustioribus, infimo 4-angulato albido, sequentibus 2 obscuris, ceteris 
albidis seu seepius fusco-variegatis, superioribus tenuioribus pallidis, summo deficiente seu 
robusto elongato curvato; aculeo centrali valde bulboso teretiusculo elongato fusco-atro sursum 
curvato rarissime deficiente; floribus magnis purpureis subverticalibus; ovarii tubique pulvillis 
25-35 aculeolos iis —— seepe adustos gerentibus; sepalis interioribus 12-15 lineari- 
