445 
Specimens examined: COAHUILA (Gregg of 1848-49): San Luis 
PoTost (Gregg of 1848; Parry of 1878; Parry and Palmer 282; Bor- 
racte of 1880; Eschanzier of 1891): MEXx1co, with no state given (Bour- 
geau 304 of 1865): CUBA ( Wright of 1860-64): also growing in Mo. Bot. 
Gard. 1893. 
This very widely distributed species is also reported in Mexico from Sonora and 
Raza Island (in northern part of the Gulf of California), 
“* Stems more or less erect, much branched: joints mostly cylindrical : woody skeleton 
solid or tubular and reticulated: larger spines terete and sheathed: flowers purplish 
(mostly yellow in ++), 
+ Wood mostly reticulate-tubular ; joints thick, with distinct tubercles : spines numerous. 
++ Diffusely branched: joints subclavate: flowers mostly yellow : fruit dry and spiny. 
73. Opuntia ciribe Engelm. MSS. 
Short, robust, and arborescent, densely branched, rarely more than 9 
dm, high, but very compact: joints obovate, 5 em. long and 3 em. in 
diameter, with crowded angular obovate tubercles 6 mm. long: pulvini 
sparsely if at all bristly: large spines 3 to 5, pale-yellow, sheathed, 12 
to 16 mm. long; 4 to 6 small dark bristly unsheathed ones on lower 
part of pulvinus: flowers yellow: fruit tuberculate like the joint. 
Type, Gabb 24 in Herb. Mo. Bot. Gard. 
Lower California, “from Comondu and Loreto northward beyond 
Rosario.” 
Specimens examined: LOWER CALIFORNIA (G@abb 24), 
74. Opuntia davisii Engelm. Syn. Cact. 305 (1856). 
Stem spreading and somewhat procumbent, with dense wood and 
divaricate branches, 4.5 dm. high: joints attenuate at base, rather 
slender, 10 to 15 em. long (younger ones erect), with oblong-linear 
tubercles 14 to 16 mm. long: inner spines 4 to 7, subtriangular, diver- 
gent, reddish-brown, in a loose straw-colored sheath, 2.5 to 3.5 em. 
long; lower ones 5 or 6, slender, 6 to 12 mm. long: flower yellowish?: 
fruit ovate, spiny, 2.5 em. long or more. (J/l Pacif. R. Rep, iv, t. 16.)— 
Type, Bigelow of 18535 in Herb. Mo. Bot. Gard. 
From northwestern Texas through New Mexico and southern Colo- 
rado to southern California, 
Specimens examined: TEXAS (Bigelow of 1853, “Staked Plains;” 
Mensebach of 1879 and 1882): NEw Mexico (Rusby 145): CoLORADO 
(Brandegee of 1875): ARIZONA (Palmer 303 of 1870, Bear Springs): 
CALIFORNIA (Parish of 1880): also cult. Mo, Bot. Gard. 1877 and 1882; 
and growing 1893. 
75. Opuntia echinocarpa Engelm. Syn. Cact. 305 (1856), 
A low shrub 1.5 to 4.5 dm. high, with reticulate-woody stem, ereczish 
or partially prostrate, with numerous very spreading branches: joints 
ovate, clavate at base, 2.5 to 6 em. long, less than 2.5 em. thick, with 
prominent ovate crowded tubercles 8 to 10 mm. long: pulvini with few 
