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. 32370. 1896. 
Echinocactus setispinus mierensis Schumann, Gesamtb. Kakteen 340. 1898. 
Echinocactus setispinus orcuttii Schumann, Gesamtb. Kakteen 340. 1898. 
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 8 mm. 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 
ality, 
Fics. 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, fhamatis an 
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 raed 
Berlandier as Cactus bicolor and Schumann refers to it as Echinocactus bicolor Ber andier 
(Gesamtb. Kakteen 339. 1898). It is, however, very different from Cactus bicolor Ber- 
landier (Mem. Comm. Limites 1. 1832). we 
Echinocactus cachetianus (Labouret, Monogr. Cact. 202. 1853), although not described 
in the place cited, is probably to be referred here. It 1s described, owe - ” os 
Zeitung (4: 173. 1885). E. cachetianus orcuttii is given as a synonym 2 ; F we ms 
orcutttt by Schelle (Handb. Kakteenk. 159. 1907). At the Same Place wcnene nuscript 
variety FE. setispinus martelii Garde frér. Echinocactus marisianus Galeotti, a manuscrip 
name, is referred here by Schumann (Gesamtb. Kakteen 339. 1898). 
