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, Alexico. 



Distribution: Common in the state of Chihuahua, IMexico. 



Mammillaria 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 

 S'STion\Tn of Jl/. scheeri, but we believe that it must be distinct and that M. dclaetiana 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 Mammillaria dclaetiana. 



Figirre 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- 





Fig. 38. — Coryphantha palhda. 



Fig. 39. — Coryphantha pycnacantha. 



pressed; centrals usually 3, but sometimes more, the two upper more or less ascending, the lower 

 porrect or cur\'ed downward, with tip black, or sometimes black tliroughout; flowers very large, 

 often 7 cm. long and nearly as broad; outer perianth -segments narrow, greenish vellow, with a red- 

 dish stripe on back ; inner perianth-segments pale lemon-yellow, broader than outermost, acuminate ; 

 ovar}- 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 Tehuacan, Mexico. Collected by J. N. Rose in 1901 

 (^'^- 5583' t^'pe), in 1905 (Nos. 99972 and loooi), and in 1906. Living specimens were 

 also obtained and these have flowered repeated!}^ in cultivation. It was also collected 

 by C. G. Pringle in 1901 (No. 8573) and distributed as Mammillaria pycnacanthaf . 



