ZAR. Y219: 
MAMMILLARIA prismatioa. 
Native of Mezico. 
Nat. Ord. Cactex. Tribe Ecu1nocactTEs. 
Genus Mammitiaria, Haw. ; (Benth. et Hook. f. Gen. Pl. vol. i. p. 84). 
Mammuityiarta (Anhalonium) prismatica ; acaulis, tuberculis radicalibus 1 poll. 
latis spiraliter imbricatis crusta cartilaginea tenui opace glauco obductis 
late deltoideis obtusis v. retusis marginibus rotundatis, superioribus basi 
foliaceo-applanatis superne incrassatis trigonis acutis deltoideo retusis 
integerrimis apicibus in plantis juvenculis (rarissime in maturis) pul- 
verigeris, axillis lanatis, floribus terminalibus basi lana copiosa velatis. 
M. (Anhalonium) prismatica, Hemsl. in Biol. Centr. Amer. Bot. vol. i. p. 519 
(exel. citat.). 
M. aloides, Monv. Cat. 1846, ex Labour. Monog. Cact. p. 153. 
M. (Anhalonium) retusa, Mittl. Man. Amat. Cact. p. 11, ex Labour l. ec. 
Anhalonium prismaticum, Lem. Cact. Hort. Monv. 1839, p-1; im Hortic. 
Univers. t. 30; in Berlin Gartenz. (1835), p. 541, fig. 126; Les Cactees, 
p. 41; Labouret. Monog. Cact. (1847), p. 158; Salm. Dyck. Cact. Hort. 
Dyck. pp. 5, 77. 
A. retusum, Salm Dyck. l. c. p. 5. ee OF : 
Ariocarpus retusus, Scheidw. in. Bull. Acad. Bruel vi. (1839), p.88|; in Hortic. 
Belg. (1838)), p. 377 ; et in Ann. Se. Nat. vol. x. (1838), p. 1 
The genus Anhalonium, founded by Lemaire (Cact. Gen. 
Nov. and sp. Hort. Monv. p. 1) in 1839, on certain species 
of Mammillaria with naked tubercles, and the flowers 
formed on the terminal tubercles, was reduced by Engel- 
mann, the most learned author on Cactex, to a section of 
the latter genus, in his account of the species of the Order 
collected during the progress of the United States and 
Mexican boundary survey under the command of Lieut- 
Col. Emory. Under the only species there described, M. 
Jissurata, Engelm., p. 18, t. 17, Dr. Engelmann says of 
the Anhalonia: ‘* These very curious plants, some of them 
looking more like some Aloe than like a Cactus, can never- 
theless not be separated from Mammillaria. The seed is 
the only part of the organs of fructification which seems 
to me to offer any character, by having a hard roughly 
tubercled testa in ours, as well as in another Mexican 
species which I had the opportunity to examine. Our species 
FEeBrvuary 1st, 1893. 
AX. (/838) p 492, — eHe) 
