922 CONTRIBUTIONS FEOM THE NATIONAL HERBAEIUM. 



7. Echinocereus leeanus (Hook.) Lem. ; Forst. Handb. Cact. ed. 2. 828. 1885. 

 Cereus leeanus Hook, in Curtis's Bot. Mag. 75: pi. M17. 1849. 

 Echinocereus multicostatus Cels; Forst. Handb. Cact. ed. 2. 828. 1885. 

 Native of Mexico, but the range unknown. 



Plant erect, about 30 cm. high, 10 cm. thick at base, tapering gradually to- 

 ward the top, simple so far as known ; ribs 12 to 14, acute, bearing rather 

 closely set areoles; spines about 12, acicular, very unequal in length, the cen- 

 tral and longest about 2.5 era. long; flowers brick-red, 5 to 6 cm. long; inner 

 perianth segments somewhat spreading, spatulate to obovate, 3 cm. long, acute. 



8. Echinocereus polyacanthus Engelm. in Wisliz. Mem. North. Mex. 104. 1848. 

 Cereus polyacanthus Engelm. in A. Gray, PI. Fendl. 50. 1849. 

 Chihuahua and Durango ; type from Cosihuiriachi, Chihuahua. Arizona. 

 Cespitose, forming clumps of 20 to 50 stems, pale green but often tinged 



with red; ribs usually 10, low; areoles approximate; spines gray when old, 

 at first pale yellow, becoming more or less purplish; radial spines about 12; 

 centrals 4, straight, elongate ; flowers crimson, 6 cm. long ; spines on ovary and 

 flower tube yellow, intermixed with cobwebby wool. " Pitahaya." 



9. Echinocereus pacificus (Engelm.) Britt. & Rose, Cactaceae 3: 12. 1922. 



Cereus phoeniceus pacificus Engelm. West Amer. Sci. 2: 46. 1886, 



Cereus pacificus Coulter, Contr. U. S. Nat. Herb. 3: 397. 1896. 



Northern Baja California ; type from Bahfa de Todos Santos. 



Cespitose, growing in clumps 30 to 60 cm. in diameter, sometimes con- 

 taining 100 stems, these 15 to 25 cm. long, 5 to 6 cm. in diameter ; ribs 10 

 to 12, obtuse ; spines gray, with a reddish tinge ; radial spines 10 to 12, 5 

 to 10 mm. long; central spines 4 to 5, the longest sometimes 25 mm. long; 

 flowers deep red, rather small, about 3 cm. long ; areoles on ovary and 

 flower tube bearing long tawny wool and reddish brown bristly spines ; fruit 

 spiny, 



10. Echinocereus acifer (Otto) Lem.; Forst. Handb. Cact. ed. 2. 798, 1885. 

 Cereus acifer Otto; Salm-Dyck, Cact. Hort. Dyck. 1849. 189. 1850. 

 Echinocereus durangensis Riimpler; Forst. Handb. Cact. ed. 2, 799, 1885, 

 Reported from Durango and Coahuila, 



Cespitose, glossy green, erect ; ribs 10, strongly tubercled ; radial spines 

 5 to 10, 10 to 16 mm. long, pale brownish, bulbose and purplish at base; 

 centrals 4, stout, purplish brown, the three upper erect, the lower and stouter 

 one subdeflexed ; flowers scarlet. 



11. Echinocereus rosei Woot. & Standi. Contr. U. S. Nat. Herb. 19: 457, 1915. 

 Chihuahua. Western Texas and southern New Mexico ; type from Agricul- 

 tural College, New Mexico. 



Cespitose, forming small compact clumps, the stems 10 to 20 cm. long, 5 to 

 8 cm. in diameter, sometimes as many as 40; ribs 8 to 11, obtuse; areoles 

 rather closely set; spines pinkish to brownish gray; radial spines about 10, 

 spreading ; centrals 4, 4 to 6 cm. -long ; flowers 4 to 6 cm. long, scarlet ; inner 

 perianth segments broad, obtuse ; spines on ovary and flower tube brownish or 

 yellowish, intermixed with short hairs; fruit spiny. 



12. Echinocereus maritimus (Jones) Schum. Gesamtb. Kakt. 273. 1898. 

 Cereus maritimus Jones, Amer. Nat. 17: 973. 1883. 



€ereus flaviflorus Engelm.; Coulter, Contr. U. S. Nat. Herb. 3: 391. 1896. 

 Echinocereus flaviflorus Schum. Gesamtb. Kakt. 274. 1898. 

 West coast of Baja California ; type from Ensenada. 



Decidedly cespitose, often forming clumps 60 to 90 cm. broad and 30 cm. 

 high, sometimes containing 200 joints; individual joints globose to short-cyl- 



