HAMATOCACTUS. 
105 
Echinopsis nodosa Linke, Wochenschr. Gartn. Pflanz. 1: 85. 1858. 
Echinocactus nodosus Hemsley, Biol. Centr. Amer. Bot. 1: 535. 1880. 
Echinocactus setispinus muhlenpfordtii Coulter, Contr. U. S. Nat. Herb. 3: 370. 1896. 
Echinocactus setispinus mierensis Schumann, Gesamtb. Kakteen 340. 1898. 
Echinocactus setispinus orcuttii Schumann, Gesamtb. Kakteen 340. 1898. 
A 
Plants up to 15 cm. high, with long fibrous roots; ribs usually 13, more or less oblique, thin, 
high, undulate on the margin; radial spines 12 to 16, slender, often 4 cm. long, some white, others 
brownish; central spines 1 to 3, longer than radials; flower 4 to 7 cm. long, yellow, with a red center; 
inner perianth-segments oblong, acute, widely spreading; fruit 8mm. in diameter, nearly naked; 
seeds 1.2 to 1.6 mm. in diameter. 
Type locality: Thickets along the Colorado River, Texas. 
Distribution: Southern Texas and northern Mexico. 
Two species or very distinct forms pass under E. setispinus; both are common about 
Brownsville, Texas, and some very fine plants and photographs have recently been 
sent us by Mr. Robert Runyon. He believes that they are distinct species and the extreme 
forms are certainly very different. The two forms, however, grow at the same locality 
Figs. 113 and 114.—Hamatocactus setispinus. 
under the same conditions and so far as we know have the same flowers and fruits. Engel- 
mann, too, had noted the differences and gave them the varietal names, hamatus and 
setaceus. It will require still further field work before we can reach a definite conclusion 
regarding the limits of this species. 
According to Engelmann (Cact. Mex. Bound. 21), this species was sent to him by 
Berlandier as Cactus bicolor and Schumann refers to it as Echinocactus bicolor Berlandier 
(Gesamtb. Kakteen 339. 1898). It is, however, very different from Cactus bicolor Ber¬ 
landier (Mem. Comm. Limites 1. 1832). 
Echinocactus cachetianus (Tabouret, Monogr. Cact. 202. 1853), although not described 
in the place cited, is probably to be referred here. It is described, however, in Garten- 
Zeitung (4: 173. 1885). E. cachetianus orcuttii is given as a synonym of E. setispinus 
orcuttii by Schelle (Handb. Kakteenk. 159. 1907). At the same place Schelle lists the 
variety E. setispinus martelii Garde frer. Echinocactus marisianus Galeotti, a manuscript 
name, is referred here by Schumann (Gesamtb. Kakteen 339. 1898). 
