II 
JL-. tr.CL< 
I ^. <r: rty.jrGrJ-- / • A 
yihy-'j- . (<M*J\ 
™_ fh~. V >1. iv.CLrf-. y 
I (A.C. <%y>.2r(2^-. y>. ^ 
From north and east of Santa Fe and the Llano Estacado, to Zuni; 
extending southward deep into Mexico : fl. May-July.—Northward 
5-6, south 10-20 or more, feet high ; easily characterized by the 
horizontal and verticillate branches, etc. 
43. O. acanthocarpa, E. & B. in P. R. R.: arborescens; 
alternis adscendentibus; articulis cylindricis ; tuberculis elongatis; 
aculeis 8-25 stellato-divaricatis ; bacca subglobosa tuberculata acu- 
leata; seminibus multangulatis. 
Mountains of Cactus Pass, between Santa Fe and the Western Col¬ 
orado. — Stems 5 - 6 feet high; branches few, alternate, and separat¬ 
ing from the stem at an acute angle. Joints, (as in the preceding) 
4 - 6 or 8 inches long, about 1 inch in diameter ; tubercles 9-10 lines 
long ; interior spines 1 - 1£ inches, exterior ones 4-10 lines, long. 
Spines of fruit on the depressed tubercles 3-6 lines long. Seeds 
large, unlike those of any other Opuntia seen by me. 
44. 0. mamillata, A. Schott in litt., B. C. R.: arborescens, divari- 
cato-ramosissima ; articulis crassis abbreviatis perviridibus ; tuberculis 
tumidis ; aculeis 4-6 brevibus plerisque deflexis ; flore parvo purpu- 
reo ; bacca obovata inermi; seminibus parvis. 
Sonora, on the Sierra Babuquibari, in fertile soil: fl. July and Au¬ 
gust. — Stems 5-6 feet high ; joints 3-4 inches long, 1£ inches in 
diameter; the swelling tubercles very prominent; spines 3-9 lines 
long, sometimes almost wanting. Flowers an inch or less in diameter. 
45. O. Thurberi, E. in B. C. R.: frutescens, erecta ; articulis cylin¬ 
dricis gracilibus elongato-tuberculatis; aculeis 3-5 brevibus diver- 
gento-deflexis; flore miniato. 
Bacuachi, Sonora : fl. June. — Much more slender than any spe¬ 
cies yet enumerated in this subgenus. Joints £ inch in diameter; 
tubercles 9 lines long; spines 3-8 lines long, the lowest one the 
stoutest. Flower 1| inches in diameter. 
# * Monacanthoz: lignum densum: articuli graciliores obscure tu- 
berculati: aculei singuli: flores flavi seu rubri; semina plus minus 
marginata. 
46. O. Wrightii, E. 1. c.: frutescens, erecta ; articulis cylindricis 
gracilibus elongato-subtuberculatis ; aculeis subsingulis porrectis vel 
subdeflexis; flore miniato. 
On steep mountain-sides, from the Limpio to the Pecos, and in 
Northern Mexico : fl. June and July. — Shrub 2-4 feet high, 1 - \\ 
IV 
o 1 
cm 
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