Type : Guyana, monts Kanuku, partie nord-ouest, mont Iramaikpang, 700 m, forêt dense, 22-23/04/1938, fleurs. Shrub 2 m high. Petals white. A.C. Smith 3608 (HT:
NY00221589; IT:
A00072144,
F0063483F,
K000536940,
LIL001037,
MO-313711,
S05-3758,
U0003992,
US00123649).