- Butomus
Taxobox
name = Flowering rush
image_width = 200px
regnum =Plant ae
divisio = Magnoliophyta
classis =Liliopsida
ordo =Alismatales
familia = Butomaceae
genus = "Butomus"
species = "B. umbellatus"
binomial = "Butomus umbellatus"
binomial_authority = L.Butomus is the sole
genus in the monogenetic plant family Butomaceae, containing the single species "Butomus umbellatus", also known as flowering rush or grass rush.Description
The plant is a rhizomatous perennial
aquatic plant . Its name is derived from Greek "bous", meaning "cow", "ox" etc and "tome", a cut (the verb 'temnein' meaning "to cut"), which refers to the plant's swordlike leaves.Other than suggested by its English common name, it is not a true rush. It is native to
Eurasia and grows on the margins of still and slowly moving water down to a depth of about 3 m. It has pinkflower s. Introduced intoNorth America as anornamental plant it has now become a serious invasive weed in theGreat Lakes area. InIsrael , one of its native countries, it is anendangered species due to the dwindling of its habitat.The plant has linear
leaves up to 1 metre long, or more. The leaves are triangular in cross-section and arise in two rows along the rhizome.The
inflorescence is umbel-like consisting of a single terminalflower surrounded by three cymes. Theflowers are regular andbisexual . There are three petal-likesepals which are pink with darker veins. They persist in thefruit . The threepetals are like the sepals but somewhat larger. 6 - 9stamens .Carpels superior, 6 - 9 and slightly united at the base. When ripe they are obovoid and crowned with a persistent style. Ovules are numerous and found scattered over the inner surface of thecarpel wall, except on the midrib and edges.Fruit is a follicle. Theseeds have no endosperm and a straight embryo.Butomaceae
Butomaceae 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 theAPG system , 1998), also recognizes such a family, and places it in the orderAlismatales , in the clademonocots . The family counts a single species, "Butomus umbellatus ".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 subclassAlismatidae , in classLiliopsida [=monocotyledons] .Uses
Frequently cultivated as an attractive ornamental plant. In parts of Russia the rhizomes are used as food.
External links
The species
* [http://www.invadingspecies.com/Invaders.cfm?SID=3&A=Page&PID=9 InvadingSpecies.com]
* [http://plants.usda.gov/java/profile?symbol=BUUM USDA info]
* [http://aquat1.ifas.ufl.edu/butumb.html University of Florida, Center for Aquatic and Invasive Plants]
* [http://www.habitas.org.uk/flora/species.asp?item=2108 Flora of Northern Ireland]
* [http://www.tau.ac.il/~ibs/album/butomus.u.html Tel Aviv Univ. close up of flower]
* [http://www.issg.org/database/species/ecology.asp?si=610&fr=1&sts= Global Invasive Species Database]The family
* [http://delta-intkey.com/angio/www/butomace.htm Butomaceae] in L. Watson and M.J. Dallwitz (1992 onwards) " [http://delta-intkey.com/angio/ The families of flowering plants:] descriptions, illustrations, identification, information retrieval". Version: 27th April 2006. http://delta-intkey.com.
* [http://www.efloras.org/florataxon.aspx?flora_id=1200&taxon_id=10135 "Monocot families" (USDA)]
* [http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=10135 Butomaceae in the "Flora of North America"]
* [http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Tree&id=50234&lvl=3&lin=f&keep=1&srchmode=1&unlock NCBI Taxonomy Browser]
* [http://www.csdl.tamu.edu/FLORA/cgi/gateway_family?fam=Butomaceae links at CSDL, Texas]
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