16 UNITED STATES AND MEXICAN BOUNDARY. 
longioribus robustioribus, centralibus, 3-12, quorum superiores robustiores, radialibus longi- 
ores, inferior robustus porrectus previor ; floribus in vertice demum lateralibus ; sepalis 30-40 
lineari-lanceolatis arachnoideo-fimbratis apice recurvis squarrosis ; petalis totidem linearibus 
sensim acuminatis integris seu exterioribus basi fimbriatis ; stigmatibus 5-10 obtusis purpureis 
tulis ; bacca ovata floris rudimentis coronata viridi ; seminibus obovatis scrobiculatis fulvis, hilo 
erecto parvo lineari ventral. 
Var. a. BOREALIS: ovata seu subglobosa, subsimplex ; aculeis radialibus 12-20, centralibus 
3-6 purpureo-maculatis ; floribus minoribus; sepalis sub-25; petalis sub-30; seminibus 
minoribus ventre concavis. M. vivipara, var. E. in Pl. Fendl. in Mem. Am, Acad. (Tab. 
L&XIV, fig. 4.) 
Var. 8. Nro-Mexicana : ovata seu ovato-cylindrica, sepe e basi ramosa; aculeis radialibus 
albidis sub-30 (20-40), centralibus 6-9 (3-12) infra albidis sursum purpurascentibus apice 
atratis ; floribus majoribus ; seminibus majoribus ventre subconcavis. 
Var. 7. Texana (M. radiosa, E. in Pl. Lindh.) : ovato-cylindrica, subsimplex ; aculeis radia- 
libus 20-30 albidis apice adustis, centralibus 4-5 flavis seu fulvis ; floribus majoribus ; sepalis 
40-50 ; petalis 30-40 ; stigmatibus 7-9; seminibus magnis ventre subconvexis. (Tab. LXXIV, 
fig. 5.) 
Var. a has been collected in Northern New Mexico and about Santa Fé, by Wislizenus and 
Fendler: 8, in the western parts of Texas and the southern parts of New Mexico by Wright and 
Bigelow; by the latter also on the upper Pecos, and in Sonora (a form with more spines than 
any other) by Schott. Var. 7 was sent by Lindheimer from the Pierdenales, a tributary of the 
Guadalupe in western Texas: fl. in May and June.—Var. 7 is the largest form, 2-5 inches 
high, with flowers 14-2} inches in diameter when fully expanded, and seeds fully 1 line long. 
Var. f is an intermediate form, 14 or 2 to 4 inches high, 1-2} inches in diameter ; tubercles 
3-6 lines long; spines very variable in length and number; in smaller, younger specimens, 
the exterior spines are 2-4 lines, and the interior 3-6 lines long; in larger ones the former 
are often 3-8 lines, and the latter 5-10 lines long. Seed 0.7-0.9 line long, almost straight 
on the side of the hilum, or usually somewhat concave.—Var. a. approaches very near to J/. 
vivipara of the north ; the spines, however, are stouter; the flowers smaller ; and the tubercles 
rarely proliferous ; seeds as large as in the last, and of similar shape. 
22. M. macromeris, E. in Wisl. Rep.: simplex, seu ex sulcis tuberculorum inferiorum prolifera 
et demum cespitosa, ovata seu cylindracea, lete viridis ; tuberculis magnis e basi dilatata 
elongatis teretiusculis supra sulco (juniore villoso) ad medium ultrave usque ad areolam floriferam 
tomentosam supra-axillarem producto exaratis adscendentibus patulis laxis seu rarius plus 
minus imbricatis ; aculeis gracilibus elongatis teretibus seu robustioribus sepe angulatis com- 
pressisve rectis seu paullo curvatis, exterioribus sub-12 (10-17) patulis albidis seu junioribus 
subinde rubellis apice sphacelatis, inferioribus seepe paullo brevioribus; aculeis centralibus 4 
(in plantis junioribus seepe 1-3 raro deficientibus,) longioribus robustoribus basi bulbosis 
plerumque nigricantibus, raro roseis fuscisve ; floribus supra-axillaribus magnis e coccineo pur- 
pureis; ovario nudo seu squama una alteraye sepaloidea munito; sepalis tubi 20-30 lan- 
ceolatis, inferioribus fimbriatis, superioribus integriusculis ; petalis 20-25 oblongo-lanceolatis 
versus apicem denticulatis mucronatis ; stigmatibus 7-8 supra stamina longe exsertis ; ae 
ovato-subglobosa nuda seu squamis paucis ciliatis instructa viridi; seminibus globoso- ns scl 
