514 | CACTACEZ. 
132. Mamillaria ludwigii, Ehrb. in Linnea, xiv. p. 376; Labour. Cact. p. 112. 
Mexico, Las Ranas (Ehrenberg). | 
This has been united with I. phymatothele, Bergm.; but Ehrenberg says it is 
distinct, and found in a different locality. 
133. Mamillaria macromeris, Engelm. Sketch Bot. Wislizenus’s Exped. p. 18. 
Norts Mexico, near Dofiana. 
134. Mamillaria macrothele, Mart. ex Pfeiff. Enum. p. 24. 
SourH Mexico, near Actopan, in meadows at an altitude of 6000 to 7000 feet, near 
Pachuca, Zimapan, Los Bafios de Atotonilco el Grande, &c. (Hhrenberg). 
135. Mamillaria magnimamma, Haw. Phil. Mag. Ixiii. p. 14. 
Mamillaria ceratophora, Lehm. in Dietr. & Otto, Allg. Gartz. 1835, p. 228, ex Pfeiff. Enum. p. 14. 
Soura Mexico, a rather widely dispersed and very variable species, occurring on the 
tablelands near Mexico, San Mateo, Pachuca, Sinquiluca, Apam, Zacualtepan, &ec., 
7000 to 8000 feet (Hhrenberg). Hort. Kew. 
Var. arietina. 
Rocks of Pedregal, near San Angel (Bourgeau, 266). Hort. Kew. 
136. Mamillaria maschalacantha, Monv. Cat. p. 77. 
Mamillaria leucocarpa, Scheidw. ex Labour. Cact. p. 106. 
Mamillaria mutabilis, Scheidw., y. levior, Salm Dyck, Cact. ed. 2, p. 120. 
Norra Mexico, San Luis Potosi (ex Labouret); Sourh Mexico, Oaxaca (Ehrenberg). 
137. Mamillaria megacantha, Salm Dyck, Cact. ed. 2, p. 123. 
MExico. 
138. Mamillaria meiacantha, Engelm. Cact. U.S. et Mex. Bound. Surv. p. 9, 
t. 9. figg. 1-3. 
New Mexico.—Norte MExico. 
139. Mamillaria melaleuca, Karw. ex Salm Dyck, Cact. ed. 2, p. 108, et 
Labour. Cact. p. 83. 
Mexico, Oaxaca (Karwinshi). 
140. Mamillaria micans, Dictr. in Otto & Dietr. Allg. Gartz. xvi. p. 330; 
Walp. Ann. ii. p. 674. : 
MEXxIco. 
141. Mamillaria microceras, Lem. Cact. aliq. Nov. Hort. Monv. p. 6; Walp. 
Rep. i. p. 293. 
MEXICO. 
142. Mamillaria micromeris, Engelm. Cact. U.S. et Mex. Bound. Surv. p. 1, 
t. let t. 2. figg. 1-4. 
