Flowering rush
Butomus umbellatus
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Monocots
Order:	Alismatales
Family:	Butomaceae Mirb.[1]
Genus:	Butomus L.
Type species
Butomus umbellatus L.
Species
See text

Butomus is the only known genus in the plant family Butomaceae, native to Europe and Asia. It is considered invasive in some parts of the United States.^[3]

The Butomaceae family has been recognized by most taxonomists as a plant family; it is sometimes called the "flowering-rush family".

The APG II system, of 2003 (unchanged from the APG system, 1998), also recognizes such a family, and places it in the order Alismatales, in the clade monocots. At the ranks of family and order, this is the same placement as in the Cronquist system. However, Cronquist assumed a much smaller order and assigned the order to subclass Alismatidae, in class Liliopsida [=monocotyledons].

The family counts one species, Butomus umbellatus, or two according to some authorities.

• Butomus umbellatus L. - China, Central Asia, Indian Subcontinent, Middle East, Russia, Europe; naturalized in North America^[4][5]

• Butomus umbellatus var. junceus (Turcz.) Micheli - Central Asia (also known as Butomus junceus Turcz.)^[6]

• Butomaceae in L. Watson and M.J. Dallwitz (1992 onwards) The families of flowering plants: descriptions, illustrations, identification, information retrieval. Version: 27 April 2006. https://web.archive.org/web/20070103200438/http://delta-intkey.com/.
• Monocot families (United States Department of Agriculture)
• National Center for Biotechnology Information Taxonomy Browser
• links at CSDL, Texas A&M University Archived 2008-10-12 at the Wayback Machine

Wikimedia Commons has media related to Butomus.

• Butomaceae of Mongolia in FloraGREIF Archived 2012-02-26 at the Wayback Machine