136 



THE CACTACEAE. 



8. Trichocereus macrogonus (Salm-Dyck) Riccobono, Boll. R. Ort. Bot. Palmero 8: 236. 1909. 



Cereus macrogonus Salm-Dyck, Cact. Hort. Dyck. 1849. 203. 1850. 

 Eriocereus tephracanthus Riccobono, Boll. R. Ort. Bot. Palermo 8: 244. 1909. 



Stem probably tall, stout, but in cultivation often slender, bluish green, especially on young 

 orowth; ribs usually 7, low and rounded, 1.5 cm. high, separated by acute intervals; areoles large, 

 1.5 to 2 cm. apart; spines several from an areole, acicular, brown; radial spines 5 to S mm. long; 

 central spine about 2 cm. long; flowers probably large and white; fruit unknown. 



Type locality: Not cited. 



Distribution: South America, but not known definitely in the wild state. 



This species is represented in the New York Botanical Garden by a live specimen from 

 Kew, which we consider typical. Salm-Dyck described it from specimens growing in the 

 Botanical Garden at Berlin, but did not know their origin. Schumann figured what he 

 supposed to be it in the Flora Brasiliensis, referring it to Brazil ; his plant is from the Prov- 

 ince of Rio de Janeiro, collected by Glaziou, and is undoubtedly Cephalocereus arrabidae. 



Cereus tetracanthus Labouret (Rev. Hort. iv. 4 : 25 . 1 855) and C. tephracanthus bolivianus 

 Weber (Schumann, Gesamtb. Kakteen 81. 1897) are probably of this relationship; both 

 forms come from Bolivia. Rumpler (Forster, Handb. Cact. ed. 2. 712. 1885) says the 

 former came from Chuquisaca, Bolivia. An earlier reference (Steudel, Nom. ed. 2. 1 : 336. 

 1840), but of slightly different spelling, cites Link and Otto as authors of this name, but the 

 species was not described. To one of these forms may belong the plant in the New York 

 Botanical Garden (No. 6231), obtained from M. Simon, St. Ouen, Paris, in 1901, which is 

 called Cereus bolivianus. The last name, first credited to Weber (Monatsschr. Kakteenk. 

 12: 21. 1902), is occasionally met in literature. 



Cereus hempelianus Bauer (Monatsschr. Kakteenk. 17: 55. 1907) is, according to F. Fobe, 

 only a stout, bluish-green variety of C. macrogonus. 



9. Trichocereus cuzcoensis sp. nov. 



Plants tall, 5 to 6 meters high, much branched, the 

 branches somewhat spreading, light green when young; 

 ribs 7 or 8, low and rounded; areoles rather close together, 

 1 to 1.5 cm. apart; spines numerous, often 12, very stout, 

 rio-id, sometimes 7 cm. long, swollen at base ; flowers 12 to 

 14 cm. long, doubtless nocturnal but, sometimes at least, 

 remaining open during the morning, fragrant ; flower-tube 

 green, 5 to 6 cm. long ; inner perianth-segments oblong, white, 

 4 to 5 cm. long; filaments weak, declining on the lower side 

 of the throat; scales on the ovary and flower-tube small, 

 bearing a few long hairs in their axils; fruit not known. 



Collected by J. N. Rose below Cuzco, Peru, 



September 1, 1914 (No. 19022). 



10. Trichocereus peruvianus sp. nov. 



Plant 2 to 4 meters high with numerous erect or 

 ascending, stout branches, 15 to 20 cm. in diameter, 

 glaucous when young; ribs 6 to 8, broad and rounded; 

 areoles large, 2 to 2.5 cm. apart, brown-felted; spines 

 brown from the first, about 10, unequal, some of them 4 

 cm. long, rigid and stout, not at all swollen at base; 

 areoles on ovary and flower-tube hairy; mature flowers 

 not seen but evidently large and probably white. 



Collected by Dr. and Mrs. Rose near Matucana, 



Peru, altitude 2,IOO meters, July 9 , 1914(^0. 18658). FlG ' '97-Tnchocereus peruviana. 



This species resembles T. bridge sii but has stouter and darker spines. It is found on 

 the western slopes of the Andes at a much lower altitude than that species. 



Figure 197 is from a photograph taken by Mrs. J. N. Rose at Matucana, Peru, in 1914. 



