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 E. blanckii. 
Echinocereus flaviflorus Hildmann (Schumann, Gesamtb. Kakteen 264. 1898), unpub¬ 
lished, is referred to E. 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. 
Fig. 21. — Echinocereus blanckii. 
Illustrations: Diet. Gard. Nicholson 4: 511. f. 5; Suppl. 217. f. 227, as Cereus blankii; 
Bliihende Kakteen 1: pi. 37; Cact. Journ. 1: 135; 2: 19; Forster, Handb. Cact. ed. 2. f. 97; 
Monatsschr. Kakteenk. 7: 154; Ann. Rep. Smiths. Inst. 1908: pi. 3, f. 2; Schelle, Handb. 
Kakteenk. 122. f. 55, as Echinocereus berlandieri; Cact. Mex. Bound, pi. 58; Diet. Gard. 
Nicholson 4: 510. f. 4; Suppl. 216. f. 226, as Cereus berlandieri; Monatsschr. Kakteenk. 1: 
opp. 66, as Echinocereus leonensis; Bliihende Kakteen 2: pi. 70; Forster, Handb. Cact. ed. 
2. f. 98; Rev. Hort. 36: following 92. 
Plate hi, 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, Mem. Mus. Hist. Nat. Paris 17: 117. 1828. 
Cereus pentalophus simplex De Candolle, Mem. Mus. Hist. Nat. Paris 17: 117. 1828. 
Cereus pentalophus subarticulatus De Candolle, Mem. Mus. Hist. Nat. Paris 17: 117. 1828. 
Cereus pentalophus radicans De Candolle, Mem. Mus. Hist. Nat. Paris 17: 117. 1828. 
Cereus propinquus De Candolle in Salm-Dyck, Allg. Gartenz. 1: 366. 1833. 
