Henoonia is a monotypic genus of flowering plants belonging to the family Solanaceae.

[2] It is a stiff bush, with a whitish bark, red-pubescent branches, alternate papery leaves of 3.0-3.8 cm long and 1.0-1.3 cm wide that grow from thickened nodes, with a very short leafstalk, shortly spade-shaped to oblong, the tip sharp or pointed, margin entire, veined, glabrous above, initially with soft rufous felty hair below but becoming glabrous with age except near the main vein.

The rufous, velvety calyx of 2.5 mm long consists of 5 sepals, finally splitting under the fruit.

Ovary superior, unilocular, stigma simple and nearly seated.

[3] The genus name of Henonia is thought to be in honour of Jacques-Louis Hénon (1802–1872), a French republican politician.