ECHINOCEREUS. 21 
Procumbent; joints slender, 3 to 15 cm. long, 2 to 2.5 cm. in diameter; ribs 5 to 7, strongly 
tuberculate, or when turgid scarcely tubercled; areoles 1 to 1.5 cm. apart; radial spines 6 to 8, 
8 to 10 mm. long, white; central spine solitary, 10 to 50 mm. long, brownish to black; flowers purple, 
5 to 8 cm. long; perianth-segments narrow, oblanceolate, acute. 
Type locality: Near Camargo, state of Tamaulipas, Mexico. 
Distribution: Northeastern Mexico and southern Texas. 
Dr. Rose in 1912 examined specimens labeled E. leonensis in the collection of Mr. 
Haage jr. at Erfurt which seemed to be £. blanckii. 
Echinocereus flaviflorus Hildmann (Schumann, Gesamtb. Kakteen 264. 1898), unpub- 
lished, is referred to EL. leonensis, its flowers not being yellow as the name would imply. 
This species is named for P. A. Blanck, a pharmacist in Berlin and a friend of H. 
Poselger. It is closely related to E. pentalophus. 
Echinocactus leonensis (Schumann, Monatsschr. Kakteenk. 5: 76) seems to have been 
intended for Echinocereus leonensis Mathsson. 
Fic. 21.—Echinocereus blanckii. 
Illustrations: Dict. Gard. Nicholson 4: 511. f. 5; Suppl. 217. f. 227, as Cereus blankii; 
Bliihende Kakteen 1: pl. 37; Cact. Journ. 1: 135; 2: 19; Forster, Handb. Cact. ed. 2. f. 97; 
Monatsschr. Kakteenk. 7: 154; Ann. Rep. Smiths. Inst. 1908: pl. 3, f. 2; Schelle, Handb. 
Kakteenk. 122. f. 55, as Echinocereus berlandiert; Cact. Mex. Bound. pl. 58; Dict. Gard. 
Nicholson 4: 510. f. 4; Suppl. 216. f. 226, as Cereus berlandteri; Monatsschr. Kakteenk. 1: 
opp. 66, as Echinocereus leonensis; Blithende Kakteen 2: pl. 70; Forster, Handb. Cact. ed. 
2. f. 98; Rev. Hort. 36: following 92. 
Plate m1, figure 4, shows a flowering plant sent to the New York Botanical Garden 
from the Berlin Botanical Garden in 1902. Figure 21 is from a photograph taken by 
Robert Runyon at Reynosa, Mexico, July 8, 1921, 
~» 27. Echinocereus pentalophus (De Candolle) Riimpler in Forster, Handb. Cact. ed. 2.774. 1885. 
Cereus pentalophus De Candolle, Mém. Mus. Hist. Nat. Paris 17: 117. 1828. 
Cereus pentalophus simplex De Candolle, Mém. Mus. Hist. Nat. Paris 17: 117. 1828. 
Cereus pentalophus subarticulatus De Candolle, Mém. Mus. Hist. Nat. Paris 17: 117. 1828. 
Cereus pentalophus radicans De Candolle, Mém. Mus. Hist. Nat. Paris 17: 117. 1828. 
Cereus propinquus De Candolle in Salm-Dyck, Allg. Gartenz. 1: 366. 1833. 
