BORZICACTUS. 163 



6. Borzicactus humboldtii (HBK.). 



Cactus humboldtii Humboldt, Bonpland, and Kunth, Nov. Gen. et Sp. 6: 66. 1823. 



Cerens humboldtii De Candolle, Prodr. 3: 467. 1828. 



Cleistocactus humboldtii Weber in Gosselin, Bull. Mens. Soc. Nice 44: 33. 1904. 



Procumbent, cylindric; ribs 10 to 12, low, somewhat tuberculate; spines setose, rigid; flowers 

 red, about 7 cm. long; flower-tube elongated; the scales bearing long greenish gray hairs; perianth- 

 segments lanceolate, acute, red; filaments slender, glabrous; style much longer than the perianth. 



Type locality: Between Sondorillo and San Felipe, Peru. 



Distribution: Northern Peru and probably southern Ecuador. 



The type locality when this species was collected by Humboldt was located in Ecuador, 

 but it is now in northern Peru. 



Dr. Rose while collecting in Ecuador in 1918 did not reach Peru, but he found in 

 southern Ecuador near Loja and again in the Catamayo Valley a species of Borzicactus 

 which seemed to correspond to Cactus liuinboldtii. 



7. Borzicactus plagiostoma (Vaupel). 



Cereits plagiostoma Vaupel, Bot. Jahrb. Euglcr 50: Beibl. in: 20. 1913. 



Columnar, erect, or suberect, about i meter high, attenuated and rounded at apex; ribs 15, low; 

 areoles close together, orbicular; spines numerous, nearly black; flowers numerous, cylindric but 

 somewhat zygomorphic ; ovary bearing many small, ovate, acuminate scales with black felt in axils. 



Type locality: San Miguel, Department of Cojamarca, Peru. 



Distribution: Peru. 



Said to resemble Cleistocactus baumannii, but the relationship is doubtless with the 

 species which we have referred to Borzicactus. It is known to us only from description 

 and illustrations. 



Illustrations: Monatsschr. Kakteenk. 24: 165, 167, as Cercus plagiostoma. 



8. Borzicactus aurivillus (Schumann). (.See Appendix, p. 226.) 



PUBLISHED SPECIES, PERHAPS OF THIS GENUS. 



CLEISTOCACTUS CHOTAENSIS Weber, Bull. Mens. Soc. Nice 44: 47. 1904. 



Cereits clu>l<ic>isis Yaupel, Monatsschr. Kakteenk. 23: 25. 1913. 



Plant 2 meters high; flowers 5 cm. long, orange-colored; limb 2.5 cm. broad; scales on the ovary 

 bearing long black hairs ; stamens as long as the perianth-segments. 



Type locality: On the Rio Chota, Peru. 



According to Weber this species is similar to one of the so-called species of Cercus 

 collected by Humboldt from this same general region. 



CEREUS SEKPENS (HBK.) De Candolle, Prodr. 3: 470. 1828. 



Cactus serpent Humboldt, Bonpland, and Kunth, Nov. Gen. et Sp. 6: 68. 1823. 

 Clcistocactus serpens Weber in Gosselin, Bull. Mens. Soc. Nice 44: 39. 1904. 



Stems creeping; branches somewhat angled; areoles 6-angled, spiny; spines i to 3.5 cm. long; 

 flowers tubular, 5 cm. long, flesh-colored; scales few, the upper ones spreading, glabrous; the lower 

 ones hirsute; inner perianth-segments 8 to 12, lanceolate, acute, arranged in 2 or 3 series; stamens a 

 little shorter than the perianth-segments; ovary ovate; stigma-lobes 8. 



Type locality: Dry barren hills, banks of Rio Guancabamba, near Sondorillo, Ecuador, 

 now Peru. 



Distribution: Known only from the type locality. 



This species was originally described from Bonpland's manuscript notes and no 

 specimens are extant. The type locality is definitely given and it should be re-collected 

 and positively identified. Kunth, who referred all of Humboldt and Bonpland's plants to 

 Cactus, questioned its belonging to the subgenus Cercus, while De Candolle, although 



