Stemonaceae is a family of flowering plants, consisting of three or four genera with between 25-35 species. The APG II system

APG II system

The APG II system of plant classification is the second, now obsolete, version of a modern, mostly molecular-based, system of plant taxonomy that was published in April 2003 by the Angiosperm Phylogeny Group. It was a revision of the first APG system, published in 1998, and was superseded in 2009...

 places it in the order Pandanales

Pandanales

Pandanales is an order of flowering plants, with a pantropical distribution.The APG III system places the Pandanales in the monocots. Both the APG III and APG II systems include five families in this order:* Cyclanthaceae* Pandanaceae* Stemonaceae...

, in the monocots. The family is native to southeastern Asia

Asia

Asia is the world's largest and most populous continent, located primarily in the eastern and northern hemispheres. It covers 8.7% of the Earth's total surface area and with approximately 3.879 billion people, it hosts 60% of the world's current human population...

 and northern Australasia

Australasia

Australasia is a region of Oceania comprising Australia, New Zealand, the island of New Guinea, and neighbouring islands in the Pacific Ocean. The term was coined by Charles de Brosses in Histoire des navigations aux terres australes...

, with one species in North America

North America

North America is a continent wholly within the Northern Hemisphere and almost wholly within the Western Hemisphere. It is also considered a northern subcontinent of the Americas...

.

Genera

• Croomia
  Croomia
  Croomia is a genus of primitive angiosperm herbs in the Stemonaceae Family. Three species are known. Croomia heterosepala and C. japonica are found in Japan; C. pauciflora occurs in the southeastern United States. They grow in moist shady woods. Their small flowers are borne under the...
  
  Torr.
• Stemona
  Stemona
  Stemona is a genus of about 27 species of flowering plants in the family Stemonaceae, native to eastern and southeastern Asia and northern Australasia.Selected species*S. angusta I.Telford*S. australiana C.H.Wright...
  
  Lour.
• Stichoneuron
  Stichoneuron
  Stichoneuron is a genus in the family Stemonaceae. It includes two species native to southeastern Asia....
  
  Hook.f.
• Pentastemona
  Pentastemona
  Pentastemona is a genus in the family Stemonaceae. It includes two species native to Sumatra....
  
  Steenis (sometimes placed in its own family, Pentastemonaceae)

The placement of the genus Pentastemona

Pentastemona

Pentastemona is a genus in the family Stemonaceae. It includes two species native to Sumatra....

is a matter of some controversy; it may or may not form its own family.