40 THE CACTACEAE. 
present ascending and those near top of plant connivent, the lowest central stouter than others, 2 
to 2.5 cm. long, porrect or curved downward; flowers large, 4 cm. long; outer perianth-segments 
greenish or tinged with red, the inner pale yellow; filaments greenish yellow; stigma-lobes 7. 
Type locality: Near Chihuahua, Mexico. 
Distribution: Common in the state of Chihuahua, Mexico. 
Mamamillaria salm-dyckiana was originally collected by John Potts near Chihuahua 
City and sent to Kew; its flowers and fruit were unknown. Schumann referred it as a 
synonym of M. scheeri, but we believe that it must be distinct and that M. delaetiana is the 
same. It was described from plants distributed by de Laet, who probably obtained them 
from C. R. Orcutt. 
In 1908 Dr. E. Palmer collected some fine plants near Chihuahua City, from which our 
flower characters have been drawn. 
Illustrations: Monatsschr. Kakteenk. 18: 59; 20: 92, as Mammiullaria delaetiana. 
Figure 37 is from a photograph of the plant collected by Dr. E. Palmer near Chihuahua 
City in 1908. 
26. Coryphantha pallida sp. nov. 
Plants either solitary or in clusters of about 10 or more, globular, 12 cm. in diameter or less, 
bluish green; tubercles in 13 rows, short and thick, closely set; radial spines 20 or more, white, ap- 
“ 
Fic. 38.—Coryphantha pallida. FIG. 39.—Coryphantha pycnacantha. 
pressed; centrals usually 3, but sometimes more, the two upper more or less ascending, the lower 
porrect or curved downward, with tip black, or sometimes black throughout; flowers very large 
often 7 em. long and nearly as broad; outer perianth-segments narrow, greenish yellow, with a red- 
dish stripe on back; inner perianth-segments pale lemon-yellow, broader than outermost. acuminate: 
ovary bearing a few narrow scales; stamens deep red, numerous; style yellow, longer than stamens: 
stigma-lobes 9; fruit greenish brown, 2 cm. long ; seeds brown, shining, broader at apex than below. 
Common in calcareous soil about Tehuacdn, Mexico. Collected by J. N. Rose in 1901 
(No. 5583; type), in 1905 (Nos. 99972 and r1ooo1), and in 1906. Living specimens were 
also obtained and these have flowered repeatedly in cultivation. It was also collected 
by C. G. Pringle in 1901 (No. 8573) and distributed as Mammillaria pycnacantha?. 
