io6 



THE CACTACEAE. 



more), somewhat undulate; spines several, subulate, unequal, brown to blackish, the longest 5 to 

 6 cm. long; flowers small, about 4 cm. long, yellow; scales on ovary and flower-tube small, 3 to 4 

 mm. long, acute, bearing felt and spines in their axils; fruit 2 cm. in diameter, reddish. 



Type locality: Cordilleras de Tacna, Chile (formerly Peru), 600 meters altitude. 



Distribution: Northern Chile and near Arequipa, Peru. 



Dr. Rose found this plant (No. 18801) very common on the dry hills just below Are- 

 quipa, Peru, growing mostly underground. The separated branches at first seemed to 

 represent distinct plants; it is inconspicuous, its purple stems with black spines resem- 

 bling a dead plant. 



Meyen's Travels is usually cited as the original place of publication for this species, 

 but it was published a year earlier as Cereus aureus. This last combination has usually 

 been credited to Schumann (Gesamtb. Kakteen 124. 1897). The -name assigned to this 

 plant being a homonym, we have renamed it for its discoverer, Franz Julius Ferdinand 

 Meyen (1 804-1 840), a celebrated traveler and writer. 



Figure 156 shows a branch collected by Dr. Rose near Arequipa, Peru, in 19 14. 



Fig. 157. — Erdisia spiniflora. 



4. Erdisia spiniflora (Philippi). 



Opunlia spiniflora Philippi, Linnaea 30: 211. 1859. 



Opuntia bicolor Philippi, Linnaea 33: 83. 1864. 



Opunlia clavata Philippi, Anal. Univ. Chile 41: 722. 1872. Not Engelmann, 1848. 



Cereus hypogaeus Weber in Regel, Gartenflora 31: 165. 1882. 



Echinocereus hypogaeus Riimpler in Forster, Handb. Cact. ed. 2. 784. 1885. 



Eulychnia clavata Philippi in Engler and Prantl, Pflanzenfam. 3 ca : 185. 1894, as synonym. 



Echinocereus clavatits Schumann, Monatsschr. Kakteenk. 5: 123. 1895. 



