Type : Bolivie, vallée du rio Bopi, on a cliff of the river bank, in partial shade. c. 900 m [3000 ft.], 12/09/1921, fleurs. Slender shrub. Fls green yellow. Stamens white, turning yellow with age. H.H. Rusby 666 (HT:
NY00386736; IT:
BKL00004045, MICH1109803,
NY00386735).