Seed grown and at least one authority believes this to be a form of Begonia mendumae, from Sulawesi. This species is quite variable and bears rather thin textured foliage in clumps with ether pale pink or white blooms.
Out of the seedlings I grew, I selected (kept) the best four to be offered as prime examples of this stunning species. They represent the most dramatically color patterned and strong growing of their lot. "Select form 1" bears the most darkest leaf base color - almost a blue tint overall with silvery marbling/stippling around its perimeter with reddish stems and hairs. Flower color is a medium-dark pink.
Culturally, It seems that this species responds well to high humidity that so suits others of its ilk - so is likely best grown under-glass (terrarium). That being said, so far it appears to be a reliable and trouble-free grower and is fairly quick to propagate. The only aspect to watch for - is its thin leaf substance makes it easy to wilt/rot if in too low a humidity or is kept too wet.
Offered here as a husky blooming sized plant in 2 1/2-3" pot.
View Terrarium / Begonia Culture Sheet