FEROCACTUS. 139 
Echinocactus pfersdorffii Hortus may be referable here. It is probable that EF. pfers- 
dorffii Hildmann Catalogue (Monatsschr. Kakteenk. 5: 92. 1905) is the same, but neither 
was accompanied by a description. 
In cultivation this plant is simple, depressed-globose, 4.5 dm. in diameter, but in the 
wild state sometimes cylindric and up to 6 dm. high, and described as proliferous; ribs 20, 
perhaps even more, acute; areoles rather large, distant; radial spines usually 8, subulate, 
somewhat curved, 4.5 cm. long; central spines usually solitary, but as many as 4 reported, 
all yellow. 
We have followed Schumann in refer- 
ring here various synonyms, but the indi- 
cations are that we have more than one 
species. Dr. Rose obtained flowers of this 
species at La Mortola in 1912 and his notes 
were used in drawing up the description. 
Here belongs Cactus multangularis 
Mocifio and Sessé (Mém. Mus. Hist. Nat. 
Paris 17: 38. 1828), but never described 
by them. Echinocactus  electracanthus 
rufispinus (Monatsschr. Kakteenk. 3: 70. 
1893) we would also refer here. 
\, Echinocactus hystrichacanthus Lemaire 
(Cact. Gen. Nov. Sp. 17. 1839) may be of 
this relationship. This species as well as 
E. pycnoxyphus Lemaire (Cact. Gen. Nov. 
Sp. 16. 1839) Weber considered as only 
——_—— 
varieties of EF. hystrix. —- 
Illustrations: De Candolle, Mém. Mus. nt We aa <= 
‘Hist. Nat. Paris 17: pl. 10, as Echtnocactus ie A 
melocactiformis; Monatsschr. Kakteenk. 3: Fic. 146.—Ferocactus melocactiformis. 
158. f. 2; 21: 171; Schumann, Gesamtb. 
Kakteen f. 58, as Echinocactus electracanthus; 
ingens. . 
Figure 146 is copied from the first illustration above cited. 
Blithende Kakteen 1: pl. 22, as Echinocactus 
22. Ferocactus macrodiscus (Martius). 
| 7 i $341. 1832. 
Echinocactus macrodiscus Martius, Nov. Act. Nat. Cur. 163; 341. 1 
Echinocactus macrodiscus laevior Monville in Labouret, Monogr. Cact. 197. 18 53- 
Echinocactus macrodiscus decolor Monville in Labouret, Monogr. act. 197. ae) 3 on 
Echinocactus macrodiscus multiflorus R. Meyer, Monatsschr. Kakteenk. 24: 150. . 
mes short-cylindric, sometimes 4.5 dm. in diameter; ribs 16, 
hat flattened, sometimes acute on the margin, somewhat 
ore or less curved backward; radial spines 6 to 8, 
d flatter than the radials, 3.5 cm. long; flowers 
th-segments linear-oblong, acute; stamens and 
Simple, depressed-globose or someti 
perhaps more in some specimens, somew 
depressed at the distant areoles; spines all yellow, m 
mostly 2 to 3 cm. long; central spines 4, stouter an 
5 cm. long, dark red to purple, obconic; inner perian 
style included. 
Type locality: Not definitely cited but probably on the Cumbre at about 10,000 feet, 
in a place called El Renosco, Mexico. hward 
Distribution: San Luis Potosi and southwarad. ; 
We do not know this species definitely although it is supposed to have a rather wide 
distribution in Mexico. The only specimen which we can rei with any confidence 1s 
one obtained through Professor Conzatti in 1910 from Oaxaca, Mexico. 
