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Sagina procumbens
''Sagina procumbens'' is a species of flowering plant in the pink family known by the common names procumbent pearlwort, birdeye pearlwort and matted pearlwort. It can be found throughout the Northern Hemisphere and parts of South America. It is a common weed of many environments. It can be found in wild and disturbed habitat, especially moist areas. It can sometimes be seen growing in lawns or in cracks in the sidewalk. This is a perennial herb forming clumps or mats of hairless green herbage, sometimes vaguely resembling a patch of moss. The leaves are linear and up to 1 or 2 centimeters long. The inflorescence is a solitary flower with four or five sepals and four or five small white petals, but the petals are sometimes absent.
==As an invasive species==
In 1998 numerous well-developed plants were found on the UNESCO World Heritage Site of Gough Island where it is an introduced species. Given the island's remoteness seeds were most likely introduced from visitors' footwear and/or clothing. Without control the plant will very likely transform the ecosystem of the island's uplands - as it has already done on the Prince Edward Islands where it has spread at a rate of 100m to 300m per year and is now considered beyond control.
〔Cooper, J. et al., ("Earth, fire and water: applying novel techniques to eradicate the invasive plant, procumbent pearlwort Sagina procumbenss, on Gough Island, a World heritage Site in the South Atlantic" ), Invasive Species Specialist Group, 2010, Retrieved on 12 February 2014.〕 Eradication programs on Gough Island are ongoing and are expected to require years of 'concerted effort'.
〔Bisser, P. et al., ("Strategies to eradicate the invasive plant procumbent pearlwort Sagina procumbens on Gough Island, 2010" ), Retrieved on 12 February 2014.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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