i6 



TH^ CACTACBA^. 



white, with black tips; central spines i to 3, brown, stouter than the radials; flowers nocturnal, 10 

 to 12 cm. long; inner perianth-segments white, lanceolate, acuminate, 10 cm. long, the margins 



ovary 



green 



Type locality: Brazil. 

 Distribution: Brazil. 



The illustration of Schumann, here cited, resembles the species of Argentina more 







those of Brazil. 



eported growing in the Hanbury Garden at La Mortola 



York 



m 1915. 



Illustration: Schumann. Gesamtb 



Fig. 15. — Cereus obtusus. 



i:f 







- -f-: 





n 



/■ 



-vJ 



I ^ 



> 



Fig. 16. — Cereus aethiops. 



W 



20. Cereus chalybaeus Otto in Forster, Handb. Cact. 382. 



't 



■i 



1846. 



r i 



Piptanthocereus chalybaeus Riccobono. Boll. R. Ort. Bot. Palermo 8: 227. 



1909 



intervals 



but on old stems much more numerous centLT' "''''"^ ""' \^'' P^'P"'^ = ^^^^^1 spines usually 7 

 dark brown; perianth large, abouT2 dm Ion. .„d ?!f '^''^^^^^ "."^^ ^°"Ser than the radiSsfaH 

 about I dm. long, purplfsh, bearing Lgf.be^^^^^^^^ 



segments pmkish, narrowly oblong the innrr w??f f ^/^^ned by mmute scales; outer perianth- 

 long-exserted beyond theVoa"^but Sefthan^tr '""^'l]^'' toothed; filaments nSr^erous, 

 longer than the filaments, weak; 's^^^^ ^ Z^^^^:^^;^^^ -ch 



Type locality: Not 



Distribution: Northern Argent 



5? 



