Species of aquatic plant
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Camptotheca acuminata is a species of tree in the "Camptotheca" genus that is native to north Vietnam and southern China. It is also cultivated in the southern United States. 
A eudicot, it is a flowering deciduous tree with light gray bark. It can grow to a height of . Its large, papery leaves are somewhat oval in shape, usually long and wide. The flowers, which bloom from May through July, produce a gray-brown fruit with one seed in September. 
Uses.
"Camptotheca acuminata" is a source of camptothecin chemicals, which have been tested for potential use as treatments for cancer and HIV. The modern chemotherapy drugs topotecan and irinotecan are derived from it, though now the molecules are produced in a lab environment rather than extracted from the leaves and bark of the tree. Because of this, it is sometimes called the "cancer tree".
In traditional Chinese medicine, the tree is called xi shu ("tree of joy" or "happy tree") and was considered a relatively unimportant medicinal plant.
The tree is also grown for shade and ornamental value.