CEPHAUKIvKICUS. 



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 19 18. 



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

 Nat. Herb. 12: 415. 1909. 



Pilocercus 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. twecdyanus. X0.5. 



Fig. 81. — Fruit of same. X0.5. 

 Erect, sometimes 5 to 6 meters 

 high, branching from the base; 

 branches rather slender, spreading, 

 12 to 14-ribbed, the ribs some- 

 what tuberculate; spines 10 to 14, j 

 acicular, about 1 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 191 2. 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 1 meter down from the top of the plant; flowers 7 cm. long, 

 smooth, pale pink. 



Type locality: Venticas del Dagua, Colombia. 

 Distribution: Northwestern Colombia. 



Cephalocereus colombiani; 



