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29. M. macromeris, E. in Wisl. Rep. (M. dactylothele, Lab.): 
simplex s. e basi ramosa, ovata; tuberculis magnis patulis, laxis, tenu- 
iter ultra medium sulcatis ; aculeis tenuibus elongatis rectis s. paullo 
curvatis exterioribus 10 - 17 albidis, centralibus sub-4 longioribus 
robustioribus subangulatis, fuscis s. nigricantibus; floribus ex areolis 
supra-axillaribus in tuberculo ipso oriundis magnis; bacca subglo- 
bosa viridi; seminibus parvis lsevibus fuscis. 
In the valley of the Rio Grande, from Southern New Mexico to the 
middle course of the river near Presidio, and even lower down: fl. 
July and August. — A most remarkable species in many respects, 
and forming a transition to Echinocactus, though the mamillate form 
is so very striking. Plant 2-4 inches high; tubercles variable, 6-8 
or 10-12 and even 15 lines long. Radial spines £-1% inches 
long; central ones often 1£ - 2£ inches in length. Axils always 
naked. Flower springing from the lower end of the groove, which 
runs down about two thirds of the tubercle, 2J - 3 inches in diame¬ 
ter, rose-colored or purple ; not rarely with a few sepaloid scales on 
the ovary (and fruit). Seeds thick, but only 0.6- 0.8 line long. 
Subgen. 3. Anhalonium. (Gen. Anhalonium, Lem. ; Ariocarpus, 
Scheidw.) Flores e basi tuberculorum hornotinorum triangularium 
subinermium vel in vertice ipso oriundi: ovarium emersum. 
30. M. fissurata, E. in B. C. R.: simplex, deprefiso-globosa s. ap-. 
planata; tuberculis e basi applanata crassis extus infraque lsevibus, 
supra sulco centrali villoso lateralibusque glabris profunde quadripar- 
titis sulcisque transversalibus superficialiter multifidis, inermibus; 
floribus e villo longo sericeo centralibus roseis; baccis ovatis vires- 
centibus in lana densa occultis ; seminibus nigris tuberculatis. 
On the limestone hills, near the junction of the Pecos with the Rio 
Grande : fl. October. Heads 2-4^ inches in diameter; tubercles 6 - 
10 lines long, and a little less broad ; central longitudinal groove in the 
very young ones bearing dense silky wool over half an inch long, 
which by age becomes dirty and matted, and finally disappears entirely 
in the very old ones. The lower end of the. groove, which only extends 
down as far as the rough or verrucose part of the tubercle goes (about 
two thirds downward), bears the flower and fruit, very much like the 
floriferous areola of the last-mentioned species. Flower about one 
inch long and wide. Seed very roughly tuberculated, different from 
that of any other Mamillaria examined by me, but quite similar to 
that of other Anhalonia. 
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