Duma florulenta

Tangled lignum
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Order:	Caryophyllales
Family:	Polygonaceae
Genus:	Duma
Species:	D. florulenta
Binomial name
Duma florulenta (Meisn.) T.M.Schust.
Synonyms
Muehlenbeckia cunninghamii (Meisn.) F.Muell. Muehlenbeckia florulenta Meisn. Muehlenbeckia juncea (Mitch.) Druce Polygonum cunninghamii Meisn. Polygonum junceum Mitch.

Duma florulenta (synonym Muehlenbeckia florulenta), commonly known as tangled lignum or often simply lignum, is a shrub in Australia and is the nomenclatural type of genus Duma.