Byttnerioideae

Byttnerioideae is a subfamily of the flowering plant family Malvaceae.

Byttneria is the type genus for the subfamily. Byttneria is now treated as synonym of Ayenia.

Tribes and genera
Four tribes are recognised by the Germplasm Resources Information Network:

Byttnerieae

 * Abroma Jacq.
 * Ayenia L.
 * Byttneria Loefl. (synonym of Ayenia)
 * Kleinhovia L.
 * Leptonychia Turcz.
 * Megatritheca Cristóbal
 * Rayleya Cristóbal (synonym of Ayenia)
 * Scaphopetalum Mast.

Hermannieae

 * Dicarpidium F.Muell.
 * Gilesia F.Muell.
 * Hermannia L.
 * Melochia L.
 * Waltheria L.

Lasiopetaleae

 * Commersonia J.R.Forst. & G.Forst.
 * Guichenotia J.Gay
 * Hannafordia F.Muell.
 * Keraudrenia J.Gay (synonym of Seringia)
 * Lasiopetalum Sm.
 * Lysiosepalum F.Muell.
 * Maxwellia Baill.
 * Rulingia R.Br.
 * Seringia J.Gay
 * Thomasia J.Gay

Theobromateae

 * Glossostemon Desf.
 * Guazuma Mill.
 * Herrania Goudot
 * Theobroma L.