Costus erythrophyllus is species of flowering plant in the family Costaceae. It is a tropical rhizomatous perennial plant native to Colombia, Ecuador, Peru, and northern Brazil. It was first described in 1929. The most common form in cultivation grows to about 1 meter in height, with waxy leaves that are dark green on top, and deep purple underneath. In Huambisa, Costus erythrophyllus is known as untuntu.
References
Notizbl. Bot. Gart. Berlin-Dahlem 10: 707 1929. JSTOR GingersRus