8 
12. M.cumurrera, E. in Wisl. Rep. Similar to the last two, but 
stouter ; flower larger, darker, but otherwise little different. | Radiat 
spines 10-12; the lower ones. ‘much stouter and longer: than the 
—_— ones : central spines 1 or 2, shorter. 
5. Longimamme, Salm 
bi nits fo 13. M. spHmrica, Dietr.: prolifera, cceiepitd & tuberculis ovato- 
7 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 
® "Pr A tenn, 
hemispherical masses. Tubercles 6-8 lines; spines 3—5 lines long. 
Flower 13 -—2 inches long. Fruit not seen. | 
Subgen. 2. CorypHantua. Flores e basi tuberculorum hornotino- 
rum aculeiferorum sulcatorum, vel in vertice ipso oriundi: ovarium 
emersum. as 
* 
2 TIE Tire RE eh Se She te SS a i 
§ 1. Albiflore. 
14, M. paprracantaa, E. in Pl. Fendl. (Mem. Amer. Acad. 1849). 
This interesting plant has been collected only in a single See 
near Santa Fé, which, together with, ‘"e dried flowers, is in my 
session. Shape of tubercles not well:«stinguishable, doubtful shasta 
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. Flavifore. 
« Laziflore. (The originally central flowers are pushed aside by d 
the continuous development of new tubercles.) 
5. M. Nurtariu, E.: simplex s. prolifera, ceespitosa; aculeis ra- 
bia 10-17 setaceis rectis plerumque puberulis albidis, centrali 
_ Singulo robustiore seepius deficiente ; sepalis fimbriatis et petalis : flavi- 
 Buzapice parce denticulatis lanceolatis, s. lineari-lanceolatis acutis ; x 
tigmatibus 2-8 erectis vel patulis; bacca subglobosa tuberculis : 
is (M. Nuttallii, E. 2. c. Cobsin mamillaris, Nutt: 
Linn.) : oo aenleis setaceis 13-17 cum 
ea i. eect 
