ECHINOMASTUS. 
151 
Type locality: About Pelayo, Chihuahua, between Chihuahua City and Parras. 
Distribution: States of Chihuahua and Zacatecas, Mexico. 
This species was described by Dr. Engelmann in 1848 from a single specimen collected 
by Dr. Wislizenus in Pelayo, Chihuahua. No other material was known to Dr. Coulter in 
1896 when he wrote his monograph and the species was not in cultivation in this country 
in 1900. In 190S Professor F. K- Floyd sent material from the state of Zacatecas, and since 
then both Dr. Elswood Chaffey and Dr. C. A. Purpus have sent living plants from central 
Mexico. 
Illustrations: Cact. Mex. Bound, pi. 35, f. 6 to 8; Schumann, Gesamtb. Kakteen f. 61, 
C; Mo’natsschr. Kakteenk. 5: 185; Knippel, Kakteen pi. 12, f. 1, as Echinocactus ungui- 
spinus; Balt. Cact. Journ. 2: 147; Orcutt, Rev. Cact. 54, as Echinocactus trollietii; West 
Amer. Sci. 8: 119, as Echinocactus No. 79. 
Figure 155 is from a photograph of a specimen sent in by Dr. C. A. Purpus from Cerro 
de Movano, Mexico, which has more slender and less curved central spines than the type. 
Fig. 157.—Echinomastus dasyacanthus. Fig. 158.—Echinomastus macdowellii. 
5. Echinomastus macdowellii* (Rebut). 
Echinocactus macdowellii Rebut in Quehl, Monatsschr. Kakteenk. 4: 133. 1894. 
Simple, globular or a little depressed, about 7 cm. high, 12 cm. in diameter, covered with a mass 
of interlocking spines; ribs 20 to 25, pale green, 5 to 7 mm. high, divided into tubercles; radial 
spines 15 to 20, white, spreading, up to 1.8 cm. long; central spines 3 or 4, dark colored, the longest up 
to 5 cm. in length; flowers rose-colored, up to 4 cm. long; ovary globose, said to be scaly. 
Type locality: Not cited. 
Distribution: Northern Mexico. 
We have had this species in cultivation, but it has never flowered in this country. 
According to Mr. McDowell, it comes from Nuevo Feon near the border of Coahuila, 
Mexico. 
In addition to the synonyn cited above the Index Kewensis cites a homonym, 
credited to C. R. Orcutt (West Amer. Sci. 8: 118. 1894). Perhaps both names refer to 
the same plant since they appeared in the same year, the first in September and the 
second in November. 
Illustrations: Knippel, Kakteen pi. 9; Cact. Journ. 1: pi. for March; Monatsschr. 
Kakteenk. 4: 134; West Amer. Sci. 8: 118; Sehelle, Handb. Kakteenk. 199. f. 131; Orcutt, 
Rev. Cact. 54, as Echinocactus macdowellii. 
Figure 158 is from a photograph obtained by Dr. Rose from F. Quehl in 1912. 
*The original spelling of the specific name was E. mcdowellii, but Schumann has corrected it to E. macdowellii. 
