12 THE CACTACEAE. 



lacking in the other species. The distribution of this species is much more restricted than 

 has usually been given for it; it has been reported from Texas to California and as far 

 south as La Paz, Lower California. The plant illustrated on plate 66 of Bliihende Kak- 

 teen as this species must be referred elsewhere. 



Illustrations: Tribune Hort. 4: pi. 139, as Echinocereus polyacanthus var. ; Forster, 

 Handb. Cact. ed. 2. f. 101; (?) Monatsschr. Kakteenk. 15: 41; (?) 17: 169; Schelle, Handb. 

 Kakteenk. 139. f. 67; Shreve, Veg. Des. Mt. Range pi. 24; Bull. Torr. Club 35: 83. f. 1 ; 

 Cact. Journ. 1 : 89. 



Figure 8 shows a flower of an herbarium specimen collected by Dr. Palmer near Madera, 

 Chihuahua, in 1908; figure 12 is from a photograph of a plant collected by Professor Lloyd 

 in the Santa Catalina Mountains, Arizona. 



10. Echinocereus pacificus (Engelmann). 



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

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



Cespitose, growing in clumps 30 to 60 cm. in diameter, sometimes containing 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 or 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. 



Type locality: Todos Santos Bay, Lower California. 



Distribution : Northern Lower California, recorded, apparently erroneously, from farther 

 south. 



Although the type is from the coastal hills we are inclined to refer here Mr. Brande- 

 gee's plant from the San Pedro Martir, collected May 5, 1893; the specimen shows flowers 

 and a spine-cluster. 



Mr. Brandegee's plant from Comondu Cliffs, also referred here by Coulter, may belong 

 elsewhere; it is without flowers, however, and we are uncertain of its relationship. The 

 spines are long and acicular and Mr. Brandegee's notes state that the stems are not dense 

 but sometimes hang from the rocks. 



Figure 9 shows a small flowering branch of an herbarium specimen collected by C. R. 

 Orcutt in northern Lower California in 1883. 



11. Echinocereus acifer (Otto) Lemaire in Forster, Handb. Cact. ed. 2. 798. 1885. 



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

 ? Echinopsis valida densa Regel, Gartenflora 1: 295. 1852. 

 Echinocereus acifer tenuispinus Jacobi in Forster, Handb. Cact. ed. 2. 798. 1885. 

 Echinocereus acifer brevispinulus Jacobi in Forster, Handb. Cact. ed. 2. 798. 1885. 

 Echinocereus durangensis Riimpler in Forster, Handb. Cact. ed. 2. 799. 1885. 

 Echinocereus durangensis nigrispinus Riimpler in Forster, Handb. Cact. ed. 2. 800. 1885. 

 Echinocereus durangensis rufispinus Riimpler in Forster, Handb. Cact. ed. 2. 800. 1885. 

 Echinocereus acifer trichacanthus Hildmann, Monatsschr. Kakteenk. 1: 44. 1891. 

 Echinocereus acifer durangensis Schumann, Gesamtb. Kakteen 287. 1898. 

 Echinocereus acifer diversispinus Schumann, Gesamtb. Kakteen 287. 1898. 



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 (Schumann says 1), stout, purplish 

 brown, the three upper erect, the lower and stouter one subdeflexed; flowers scarlet. 



Type locality: Not cited. 



Distribution: Durango and Coahuila, according to Professor Schumann. 



Professor Schumann recognized three varieties, based chiefly on the differences in 

 the spines. 



We have studied a small plant secured from the Berlin Botanical Garden. 



The illustration in Bliihende Kakteen cited below shows a plant with almost con- 

 tinuous ribs and one stout central spine. It presumably represents a different species. 



