Cane begonia

The cane begonias are a group of "Begonia" cultivars. Their name derives from their tough, bamboo-like stems. They can grow up to tall, which may necessitate staking. They are often ideal as houseplants when kept under control. 
Classification.
Angel wing.
Angel wing begonias are hybrid cane "Begonia"s which resulted from a cross between "Begonia aconitifolia" and "B. coccinea". The hybridization was made by California plant breeder Eva Kenworthy Gray in 1926. The name derives from their pointed leaves.
The flowers are edible, with a sweet tart taste.
Dragon wing.
The dragon wing cultivars are sterile, cane forming "Begonia × hybrida." They are very similar to Christmas candy begonias and angel wings.
Superba.
The superba begonias are cultivars of "Begonia aconitifolia."