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12. M. gummifera, E. in Wish Rep. Similar to the last two, but 
stouter; flower larger, darker, but otherwise little different. Radial 
spines 10-12; the lower ones much stouter and longer than the 
upper ones : central spines 1 or 2, shorter. 
§ 5. Longimammce , Salm. 
' 13. M. SPH2ERICA, Dietr.: prolifera, csespitosa; tuberculis ovato- 
elongatis acutatis ; aculeis setaceis radialibus 12 - 14, centrali singulo 
subbreviore vix robustiore; floris magni tubo supra ovarium emer- 
sum constricto elongato ; petalis flavis acuminato-aristatis. 
Hill-sides on the Rio Grande near Eagle Pass; also Corpus Christi, 
on the Gulf. — Single specimens clavate, but often forming dense 
hemispherical masses. Tubercles 6-8 lines; spines 3-5 lines long. 
Flower 1J--2 inches long. Fruit not seen. 
Subgen, 2. Coryphantha. Flores e basi tuberculorum hornotino- 
rum aculeiferorum sulcatorum, vel in vertice ipso oriundi: ovarium 
emersum. 
§ 1. Albijlorce. 
14. M. papyracantha, E. in PI. Fendl. (Merp. Amer. Acad. 1849). 
This interesting plant has been collected only in a single specimen, 
near Santa Fe, which, together with the dried flowers, is in my pos¬ 
session. Shape of tubercles not well distinguishable, doubtful whether 
sulcate or not; the lower ones proliferous. Spines compressed, flex¬ 
ible, of the consistency of stiff paper; 8 radiating and 3 or 4 central; 
the lowest one of these longest and broadest. Flowers white, central, 
an inch or more in length and width. Fruit not seen. 
§ 2. Flaviflorce. 
* Laxiflorce. (The originally central flowers are pushed aside by 
the continuous development of new tubercles.) 
15. M. Nuttallii, E.: simplex s. prolifera, csespitosa; aculeis ra¬ 
dialibus 10 - 17 setaceis rectis plerumque puberulis albidis, centrali 
singulo robustiore ssepius deficiente ; sepalis fimbriatis et petalis flavi- 
dis apice parce denticulatis lanceolatis, s. lineari-lanceolatis acutis; 
stigmatibus 2-8 erectis vel patulis; bacca subglobosa tuberculis 
breviore coccinea;; seminibus globosis scrobiculatis nigris. 
Var. a. borealis (M. Nuttallii, E. l.c. Cactus mamillaris, Nutt. 
Gen., 1818, non Linn.) : subsimplex ; aculeis setaceis 13-17 cum 
centrali ssepe deficiente puberulis;, stigmatibus 2 - 5 ; baccis semini- 
busque minoribus. ; • 
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