Birko esas arboro di familio betulacei.
Ul esas ordinara en Europa e kreskas generale en povra ed ofte silica sulo, til 2000 m alteso. Lua blanka kortico, glata e blilanta portas kelka nigra makuli, ofte akompanas kun krevisuro.
Birko esas pionira planti qua konstitucas ofte l'unesma arboreti lore di rikonquesto od erikeyo-kolonio da foresto.
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