Oxossia calyptrocarpa
Oxossia calyptrocarpa, a member of  Turneroideae (Passifloraceae), is a shrub native to the wet tropics of eastern Brazil. It is found in the Caatinga, Cerrado, and Atlantic forest. It is 0.2-2.5 meter tall with highly plasticitic leaves and white to lilac flowers. It is a heterostylous species. It was previously classified as Turnera, however, phylogenetic analysis supported its classification as Oxossia. External links 
Images of Oxosia calyptrocarpa from the Brazilian government  Image 1 Image 2

References 

Passifloraceae
Flora of Brazil