ECHINOMASTUS. 



149 



Dr. Schumann erroneously referred Echinocactus erectocentrus. E. bcguinii is described 

 as having a naked ovary and is a quite different plant of the Cory phanthanae. 



The flowers on various plants differ somewhat in color, the deeper colored flowers 

 being associated with higher colored spines. This difference in color extends also to the 

 stigma-lobes. The flowers give off a delicate odor; they open in the morning and close at 

 night, lasting for four days. 



Echinocactus horripilus erectocentrus is credited by Schumann (Gesamtb. Kakteen 443. 

 1898) to Weber although he never formally published the variety. 



Figure 154 is from a photograph of a plant collected by Kirk Bryan in southeastern 

 Arizona in March 1921. 



2. Echinomastus intertextus (Engelmann). 



Echinocactus intertextus Engelmann, Proc. Amer. Acad. 3: 277. 1856. 

 Cereus pectinatus centralis Coulter, Contr. U. S. Nat. Herb. 3: 386. 1896. 

 Echinocereus pectinatus centralis Schumann, Gesamtb. Kakteen 271. 1898. 

 Echinocereus centralis Rose, Contr. U. S. Nat. Herb. 12: 293. 1909. 



Simple, globular or nearly so, 2.5 to 10 cm. in diameter; ribs 13, somewhat acute, more or less 

 divided into tubercles ; areoles 5 to 6 mm. apart, somewhat elliptic ; spines rigid, red with darker tips ; 

 radial spines 16 to 25, appressed, 8 to 15 mm. long, 3 or 4 of the upper radial spines white or nearly so, 

 more slender than the others, almost bristle-like; central spines 4, subulate, 3 of them turned upward 

 and similar to the radials, 10 to 18 mm. long, the other one very short, porrect; flowers 2.5 cm. long, 

 nearly as broad as long, purplish; outer perianth-segments about 20, broadly ovate, white-margined; 

 inner perianth-segments 20 to 25, oblong, mucronate; fruit nearly globular, 8 to 10 mm. in diameter, 

 with a few scarious scales; seeds black, shining, 2 mm. in diameter. 



Fig. 156. Echinomastus intertextus. 



Type locality: Not definitely cited. 



Distribution: Southwestern Texas, to southeastern Arizona and northern Mexico. 



Engelmann states that the scales on the fruit are with or without some wool in their 

 axils. The fruit is always in a mass of wool, but so far as we have seen the scales are always 

 naked in their axils. 



When Engelmann described this species he also briefly characterized a variety dasya- 

 canthus which we have treated here as a distinct species. He says that Echinocactus 

 intertextus in this broad sense ranges from El Paso to the Eimpio and southward to Chi- 

 huahua and adds that the variety is more common about El Paso. We have seen only 



