CEPHALOCEREUS. 



55 



Figure 78 shows the type plant as it grows in thickets 

 along the coast at Santa Rosa; figure 79 shows it as it grows 

 in the open below Ayapamba, both from photographs by 

 George Rose; figure 80 shows a flower and figure 81 a fruit 

 collected by Dr. Rose near Ayapamba, Ecuador, in 1918. 



42. Cephalocereus alensis (Weber) Britton and Rose, Contr. U. S. 

 Nat. Herb. 12: 415. 1909. 



Pilocereus alensis Weber in Gosselin, Bull. Mus. Hist. Nat. Paris 



11:508. 1905. 



Cereus alensis Vaupel, Monatsschr. Kakteenk. 23: 23. 1913. FIG. 80. Flower of C. tweedyanus. Xo.5. 



FiG.Si. Fruit of same. Xo-5- 



Erect, sometimes 5 to 6 meters 

 high, branching from the base; 

 branches rather slender, spreading, 

 12 to i4-ribbed, the ribs some- 

 what tuberculate; spines 10 to 14, 

 acicular, about i to 1.5 cm. long, 

 brownish; flowering areoles on one 

 side of the stem, developing white 

 or yellowish hairs 5 cm. long; flow- 

 ers light purple to purplish green; 

 perianth-segments fleshy, usually 

 rounded at apex; ovary nearly 

 naked; fruit not known. 



Type locality: Sierra del Alo, 

 Mexico. 



Distribution: Western Mex- 

 ico. 



The type of the species was 

 collected by Leon Diguet and 

 is preserved in the Museum of 

 Paris, where it was studied by 

 Dr. Rose in 1912. To this spe- 

 cies we would refer specimens 

 collected in Jalisco, Mexico, in 

 1892, by M. E. Jones. 



Illustration: Bull. Soc. Ac- 

 clim. France 52: f. 16, as Piloce- 

 reus alensis. 



43 Cephalocereus colombianus 

 Rose, Contr. U. S. Nat. Herb. 

 12: 416. 1909. 



Cereus colombianus Vaupel, Monats- 

 schr. Kakteenk. 23: 23. 1913. 



Plant 5 to 6 meters high, more 

 or less branched throughout, the 

 branches nearly erect; ribs 8, ob- 

 tuse; spines many, 25 at an areole 

 or more, long and slender; wool of 

 the areoles long and white, produced for i meter down from the top of the plant; flowers 7 cm. long, 

 smooth, pale pink. 



Type locality: Venticas del Dagua, Colombia. 

 Distribution: Northwestern Colombia. 



FIG. 82. Cephalocereus colombianus. 



