ECHINOCEREUS. 
19 
23 . Echinocereus dasyacanthus Engelmann in Wislizenus, Mem. Tour North. Mex. 100. 1848. 
Cereus dasyacanthus Engelmann in Gray, PI. Fendl. 50. 1849. 
Cereus dasyacanthus neo-mexicanus Coulter, Contr. U. S. Nat. Herb. 3: 384. 1896. 
Echinocereus spinosissimus Walton, Cact. Journ. 2: 162. 1899. 
Echinocereus rubescens Dams, Monatsschr. Kakteenk. 15: 92. 1905. 
Plants usually simple, cylindric, 1 to 3 dm. high, very spiny; ribs 15 to 21, low, 2 to 3 cm. high; 
areoles approximate, 3 to 5 mm. apart, short-elliptic; radial spines 16 to 24, more or less spreading, 
1.5 cm. long or less, at first pinkish but gray in age; central spines 3 to 8, a little stouter than the 
radials, never in a single row; flowers from near the apex, often very large, often 10 cm. long, yellow¬ 
ish, or drying reddish; outer perianth-segments linear-oblong, 4 to 5 cm. long, acute; inner perianth- 
segments oblong, 5 cm. long; ovary very spiny; fruit nearly globular, 2.5 to 3.5 cm. in diameter, 
purplish, edible. 
Type locality: El Paso, Texas. 
Distribution: Western Texas, southern New Mexico, and northern Chihuahua. It 
has been reported from Arizona, but doubtless wrongly. 
Echinocereus papillosus rubescens (Monatsschr. Kakteenk. 15: 92. 1905) was only a 
garden name for E. rubescens. 
Echinocereus degandii (Monatsschr. Kakteenk. 5: 123. 1895), only a catalogue name 
from Rebut, is here referred by Schumann in his monograph. 
This is undoubtedly the plant which Walton calls the “true E. spinosissimus” (Cact. 
Joum. 2: 162. 1899), although we do not find the name referred to elsewhere. 
Illustrations: Cact. Mex. Bound, pi. 39, 40, 41, f. 1, 2; Gard. Chron. III. 32: 252; 
West Amer. Sci. 13: 10, as Cereus dasyacanthus; Monatsschr. Kakteenk. 15: 89, as 
Echinocereus rubescens; Bliihende Kakteen 2: pi. 81; Forster, Handb. Cact. ed. 2. f. no; 
Gartenwelt 7: 290; Schelle, Handb. Kakteenk. 130. f. 61; Cact. Journ. x: 89; 2: 19. 
Figure 19 is from a photograph of a flowering plant collected by Elmer Steams at 
Juarez, Mexico, in 1906. 
24 . Echinocereus ctenoides (Engelmann) Riimpler in Forster, Handb. Cact. ed. 2. 819. 1885. 
Cereus ctenoides Engelmann, Proc. Amer. Acad. 3: 279. 1856. 
So far as known simple, cylindric, elongated, 10 to 40 cm. long, 8 to 10 cm. in diameter, decidedly 
banded with pink and gray as in the rainbow cactus; ribs 15 to 17, low; areoles crowded together, 
short-elliptic; radial spines often as many as 20, not spreading but standing out at an angle to the 
ribs; central spines 8 to 10, arranged in a single row or sometimes a little irregular; flowers up to 10 
cm. long, about as wide as long when fully expanded, bright to reddish yellow; filaments yellow; 
style white; ovary and fruit very spiny. 
Type locality: Eagle Pass, Texas. 
Distribution: Southern Texas and Chihuahua. 
This species is near Echinocereus dasyacanthus ; it differs somewhat in its spines and it 
has a more southern range. It may not be specifically distinct. 
Echinocactus ctenoides (Index Kewensis Suppl. 1. 476) is a mistake for Echinocereus 
ctenoides. 
Illustrations: Cact. Mex. Bound, pi. 42*; Diet. Gard. Nicholson 4: 511, f. 7; Suppl. 217. 
f. 229; Watson, Cact. Cult. 73. f. 20, as Cereus ctenoides; Forster, Handb. Cact. ed. 2. 
820. f. 109. 
Figure 20 is a copy of the first illustration above cited. 
25 . Echinocereus papillosus Einke in Forster, Handb. Cact. ed. 2. 783. 1885. 
Echinocereus texensis Riinge, Monatsschr. Kakteenk. 4 : 61. 1894. Not Jacobi, 1856. 
Echinocereus ruengei Schumann, Monatsschr. Kakteenk. 5: 124. 1895. 
Cereus papillosus Berger, Rep. Mo. Bot. Gard. 16 : 80. 1905. 
All the additional illustrations cited here are copied from this plate. 
