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Trifolium thompsonii : ウィキペディア英語版 | Trifolium thompsonii
''Trifolium thompsonii'' is a species of flowering plant in the legume family known by the common name Thompson's clover. It is endemic to Washington State in the United States, where it occurs in two counties.〔(''Trifolium thompsonii''. ) Center for Plant Conservation.〕〔(''Trifolium thompsonii''. ) NatureServe.〕 One of the largest populations occurs in the Entiat Slopes Natural Area Preserve in Chelan County.〔Washington State Department of Natural Resources. (Entiat Slopes NAP. ) Accessed April 13, 2014.〕 This is a large clover with a thick stem growing up to 60 centimeters tall. The leaves are divided into three to eight serrated leaflets. The inflorescence is a round head of several bright red-lavender flowers. Blooming occurs in May through July.〔〔 Pollinators include bumblebees and the Greenish Blue, a butterfly.〔 This species grows in several types of habitat.〔 One study identified four plant associations that include the clover. The ''Pseudotsuga menziesii''/''Calamagrostis rubescens'' forest habitat is a cooler, moister area with associated species such as ''Spiraea betulifolia'', ''Penstemon fruticosus'', ''Balsamorhiza sagittata'', and ''Achillea millefolium''. The ''Artemisia vaseyana''/''Agropyron spicatum'' association includes ''Artemisia tripartita'', ''Poa secunda'', and ''Festuca idahoensis''. A third association, the ''Pinus ponderosa''/''Agropyron spicatum'' has sparse tree cover, a grass understory, and no tall shrubs. Associated species include ''Eriogonum heracleoides'', ''Phlox longifolia'', ''Haplopappus stenophyllus'', and ''Antennaria rosea''. The ''Artemisia tridentata''/''Agropyron spicatum'' association is a drier habitat which includes many forbs such as ''Allium acuminatum'', ''Agoseris grandiflora'', ''Lomatium nudicaule'', and ''Lupinus sericeus''.〔Scherer, G., et al. (1996). (Habitat characteristics and morphological differences of ''Trifolium thompsonii'' populations. ) ''Northwest Science'' 70(3) 242-51.〕 A Research Natural Area, the Thompson Clover Research Natural Area, was established in 1977〔 in the Wenatchee National Forest for the study and protection of this species.〔(Thompson Clover Research Natural Area. )〕 ==References==
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