112 



THE CACTACEAE. 



5. Echinofossulocactus heteracanthus (Mtihlenpfordt). 



Echinocactus heteracanthus Miihlenpfordt, Allg. Gartenz. 13: 345. 1845. 

 Echinocactus tetraxiphus Otto in Schumann, Gesamtb. Kakteen 363. 1898. 



Globose to short-cylindric, light green, nearly hidden by the closely set spines; ribs 30 to 34, 

 much compressed, somewhat undulate; areoles white, hairy when young; radial spines 11 to 13 

 (16 to 18, according to Schumann), acicular, white, spreading; central spines 4, brownish to flesh- 

 colored, more or less annulate, compressed; flowers and fruit unknown to us, but greenish yellow, 

 according to Schumann. 



Type locality: Real del Monte, Mexico. 



Distribution: Real del Monte, Hidalgo, Mexico. 



We have had this species in cultivation, but it never flowered and the plant has died. 

 Schumann has given a good illustration of it. Rose, No. 8717, in part, from near Real del 

 Monte, may belong here. 



Schumann took up an unpublished name of Otto (Salm-Dyck, Cact. Hort. Dyck. 

 1844. 20. 1845) for this species. 



Illustrations: Schumann, Gesamtb. Kakteen f. 63; Monatsschr. Kakteenk. 15: 160, 

 as Echinocactus tetraxiphus. 



Fig. 118. Echinofossulocactus lloydii. 



6. Echinofossulocactus albatus (Dietrich). 



Echinocactus albatus Dietrich, Allg. Gartenz. 14: 170. 1846. 



Simple, depressed-globose, 10 to 12 cm. in diameter, glaucous, the apex covered with spines; ribs 

 about 35, flat, undulate; spines yellowish white; radial spines 10, setaceous, 1 cm. long; central 

 spines 4, the uppermost flat and annulate (according to Schumann), the central terete, porrect; 

 flowers white, 2 cm. long. 



Type locality: Mexico. 

 Distribution: Mexico. 

 We do not know this species, 

 from the original of Dietrich. 



The plant described by Schumann may be different 



