Literature
An. Mus. Hist. Nat. Buenos Aires 32:477-500 (1925)
An. Prim. Reun. Sul-Amer. Bot. Rio de Janeiro 3:5-30 (1940)
CSJ(USA) 33:11
Succulenta 61(8):176, (10):225; 67(7-8):152; 77(1):9"; 96(6):270"
Adansonia 12:433-445 (1972)
Bradleya 4:65; 13:43-79
Bravo 1: 525, 526'
Ritter 1:36-40
KuaS 13(5):65-68", (6):86-89, (7):114-117, (11):187; 23(2):49-51; 25(4):86"; 50(10):242
Epiphytes 8-32:86-90; 11-43:66; 12-46:31
EPIG 9(4):131-140; 10(1):3-12; 11(1):14-20
Cacti of Eastern Brazil 225-228
NCL 253
CEB 205
Pl. Syst. Evol. 276:271-276 (2008)
Mol. Phylogenetics and Evol. 58:456-468 (2011)
Syst. Bot. 37(4):983-988 (2012)
Bot. J. Linn. Soc. 180(4):491-503 (2016)