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Diphasiastrum tristachyum : ウィキペディア英語版 | Diphasiastrum tristachyum
''Diphasiastrum tristachyum'', commonly known as blue clubmoss or blue ground-cedar, is a North American and Eurasian species of clubmoss. In North America, it has been found from Newfoundland west to Manitoba, and south as far as Georgia and Alabama. In Eurasia, it ranges from Norway south to France and Italy, east to Siberia and the Caucasus.〔〔(Altervista Flora Italiana, ''Lycopodium tristachyum'' Pursh ) includes line drawing, European distribution map〕 Upright stems can be tall or higher, and peduncles often branch two times to form four strobili. It has squarish short branches each are wide. The blue-green leaves are four-ranked and lanceolate to subulate. It can be distinguished from similar species by annual constrictions along these branches. It prefers dry clearings and woods, and is known to grow in sandy soils. Shade forms are more diffusely branched than sun forms, but branchlets are always more rounded than those of either ''D. complanatum'' or ''D. digitatum''. ==References==
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