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Sphaerophysa salsula : ウィキペディア英語版 | Sphaerophysa salsula
''Sphaerophysa salsula'' is a species of flowering plant in the legume family known by the common names alkali swainsonpea, Austrian peaweed, and red bladder-vetch. It is native to Asia but it is known in many other parts of the world as an introduced species and often a noxious weed. It grows in cultivated land and disturbed habitat, easily tolerating alkaline substrates. It is commonly seen in areas where alfalfa is grown, because the seeds of the two species look similar and the weed seed is easily imported with the crop seed.〔(CDFA EncycloWeedia )〕 This is a long-lived perennial herb growing up to 1.5 meters tall. It reproduces via seed as well as by sprouting vigorously from its creeping root system. The stems are coated in short white hairs. The leaves are made up of many oval leaflets each up to two centimeters long. The inflorescence is a raceme of several pea-like flowers each just over a centimeter wide. They may be brick-red to deep pink to brownish or red-orange in color. The fruit is a legume pod up to 3.5 centimeters long. It is inflated and bladderlike, hairless, translucent, shiny, and papery when dry. It is mottled greenish or reddish. It contains several seeds each about two millimeters long. Like other legumes, this plant contains endophytes. These include the bacterium ''Paracoccus sphaerophysae'', which was recently isolated from the roots of this species, and named for it.〔Deng, Z., et al. (2010). ''Paracoccus sphaerophysae'' sp. nov., a siderophore-producing, endophytic bacterium isolated from root nodules of a ''Sphaerophysa salsula'' growing in northwestern China. ''Int J Syst Evol Microbiol''.〕 Other rhizobia in this species include ''Shinella kummerowiae'' and species of the genera ''Rhizobium'', ''Agrobacterium'', and ''Mesorhizobium''.〔Xu, L., et al. (2008). Genetic diversity in rhizobia isolated from ''Sphaerophysa salsula'' in several regions of northwestern China. ''Acta Entomologica Sinica'' 51:5 1017-98.〕 ==References==
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