CACTACE. 7 
have counted from 50-60 radial spines. The upper central spines in my specimens are mostly 
5-7 lines long; sometimes I find 1 or 2 of them longer and hooked, and sometimes all 4 are 
said to be regularly hooked ; the lower central spine is stouter and longer than the others, 
6-9 lines long, with the sharp hook always turned upwards. Flower apparently about an inch 
long; fruit clavate or pear-shaped 6-12 lines long, and 4-6 lines in diameter, with a thin 
scarlet-colored integument, torulose from the protrusion of the large seeds ; the withered flower 
falling off leaves a wide circular umbillicus ; seeds large, visible through the thin pericarp, 
attached to conspicuous white funiculi; seed proper 0.6 or 0.7 line in diameter, with the append- 
age 1.2—1.5 line long. The curious spongy or corky appendage is larger than the seed 
itself, and buries its lower part as it were ina bluntly 3-lobed cup.* Embryo almost globose, 0.6 
line long, 0.5 line in diameter ; cotyledons small but perfectly distinct and visible; no albumen.— 
Apparently near MM. ancistroides, Lem., with 30-40 radial and 4-5 central spines, flower and 
fruit unknown ; the radial spines are said to be homogeneous, and the axils naked. 
~~ 5, M. Granamr (sp. nov.): globosa seu demum ovata, simplex seu e basi ramosa ; tuberculis 
ovatis basi dilatatis axillis nudis; areolis orbiculatis seu ovato-orbiculatis ; aculeis radialibus 
uniseriatis 15-30 albis saepe apice fuscatis nudis seu puberulis, summis brevioribus, lateralibus 
longioribus ; aculeo centrali singulo robustiore longiore sursum hamato, saepe 2 rectis sursum 
divergentibus adjectis, omnibus e basi pallidiore fusco-atris ; floribus sub vertice lateralibus rubi- 
cundis ; sepalis sub-13 lineari-oblongis obtusiusculis ciliolatis ; petalis sub 13 lineari-oblongis 
roseatis, exterioribus mucronatis, interioribus obtusis retusisve ; stylo stamina brevia longe 
superante ; stigmatibus 6-8 elongatis filiformibus suberectis ; bacca ovata (viridi?) floris rudi- 
mentis coronata ; seminibus oblique obovatis scrobiculatis nigris. (Tab. VI, fig. 1-8.) 
Mountainous regions from El Paso, Charles Wright, southward and westward to the Gila, 
Dr, Parry, and Colorado, A. Schott, and up this latter river as far as Williams’ river and 
Cactus Pass, Dr. Bigelow: fl. from June or July to August.—Stems 1-3 inches high, 1-24 
inches in diameter, simple or somewhat branching from the base, and thereby somettmes slightly 
cespitose ; tubercles 3 lines long, and when old of a corky texture, persistent when dead and dry 
like those of MV. tuberculata, disposed in 13 or 21 spiral rows. Radial spines in some smaller 
specimens 25-30, in larger ones often only 20-25, and in some Sonora specimens only 15-18 
in number ; the lateral ones are the longest, about 3-4 lines, or in the largest specimens even 
5-6 lines long ; lower spines shorter, upper ones the shortest and most slender. In smaller 
specimens only one central spine is observed, generally much longer éhan the radial spines, 
3-9 lines long, with a wide or sometimes a narrower hook, always curved upward. _ In many 
specimens one or two upper spines are found, neither so stout nor so long as the lower hooked 
one, and always straight; flower 9-12 lines long, rose-colored; fruit a small oval berry, about 
half an inch long, apparently green when ripe; seeds among the smallest in this genus, only 
0.4 or rarely 0.5 line long, slightly pitted, with a small and narrow hilum.—This pretty species 
has been named for Ool. J. D. Graham, of the United States Corps of Topographical Engineers, 
under whose auspices many of these species were collected. 2 
6. M. Wrieuti (sp. nov.): globosa seu depresso-globosa, basi obconica, simplex ; tuberculis 
teretibus ; axillis nudis; aculeis radialibug sub-12 albidis summis 3-5 paullo robustioribus 
apice fuscatis, lateralibus sublongioribus, inferioribus gracilioribus ; aculeis centralibus pler- 
umque binis divergentibus uncinatis fusco-atris radiales subasquantibus ; floribus lateralibus (?); 
sepalis exterioribus 13 triangularibus obtusiusculis fimbriatis, interioribus 8 acutis margine 
