Flowers actinomorphic, white to pale pink, sepals equal with entire margin; stamens 5, in one whorl, anthers dehiscing by longitudinal slits; style short
Flowers zygomorphic, pink to violet, sepals unequal with fimbriate margin; stamens 10, in two whorls, anthers dehiscing by terminal pores; style elongate (to be expected in Guyana)
