7 a ee = 
SS a a ee 
CORYPHANTHA. 29 
There has been considerable confusion regarding this species, which was first described 
as Mammillaria scheert by Mithlenpfordt in 1847, but this proved to bea homonym. ‘This 
led Poselger in 1853, when he transferred the species to Echinocactus, to publish it as E. 
muehlenpfordtit. 
Dr. Engelmann in 1856 described a variety of Mammillaria scheert, calling it valida. 
Some time afterwards he compared this variety with the type of the species and decided 
that they were the same. We have examined several specimens from near the type locality 
of the variety valida, which is near El Paso, Texas. 
It is possible that Scheer’s plant was a very young one, which might account for the 
differences in form and spines. The Mammillaria scheert of Schumann’s Monograph is 
a complex of 4 or 5 distinct species. 
Illustrations: Allg. Gartenz. 15: 97. pl. 2; Forster, Handb. Cact. ed. 2. 406. f. 44; 
Schumann, Gesamtb. Kakteen 485. f. 80; Monatsschr. Kakteenk. 8: 23; 10: 127; Schelle, 
Handb. Kakteenk. 237. f. 153, as Mammillaria scheert. 
- — bumamma. 
Fic. 28.—Coryphantha muehlenpfordtii. Fic. 29.—Coryphantha bum 
Figure 28 is from a photograph of a plant collected in western Texas by Mrs. 5. L. 
Pattison in 1920. 
7. Coryphantha guerkeana (Bédeker). 
Mammillaria guerkeana Bédeker, Monatsschr. Kakteenk. 24: 52. 1914. 
Plant-body globular, 6 to 7 cm. in diameter; tubercles bluish gree 
thick, bearing a large red gland at base of groove and inant pet a ee 
when young, spreading, bulbose at base, rather stout; centra spines 3 ° 4 
often bent slightly at tip; flowering areoles very woolly; ovary oblong, 
seen. 
n, somewhat broader than 
adial spines 9 to 12, yellow 
rarely one of them stouter, 
aked; flower and fruit not 
Type locality: Mexico. _ 
Distribution: Durango, Mexico. . : : 
This species is near C oryphantha poselgeriana, but 1s smaller and TS ed Pom L 
We have seen photographs of the type and have spine-clusters, 5 °F Palmer nea, 
Quehl of Halle. We would also refer here specimens obtained by Ur. ™ 
Durango City in 1906 (No. 456). 
