Triumfetta rhomboidea

Triumfetta rhomboidea, commonly known as diamond burbark, Chinese bur, or kulutkulutan in Tagalog, is a shrub that is extensively naturalised in tropical regions. It is thought that to have come to Australia from China. Its bark—sometimes called burbark--makes a kind of jute.

The taxon was first formally described in 1760 by botanist Nikolaus von Jacquin.

Description
Various sources give the number of stamens as being between 8 and 15. The fruit is round to slightly ovoid and about 6 mm in diameter with smooth spines which are about 2 mm long. The stems are covered in star-shaped (stellate) hairs. Its embryology was described by Venkata Rao in 1952.