Differences in the climatic adaptation of silver birch (Betula pendula) and downy birch (B. pubescens) in Finland based on male flowering phenology - Luomajoki, Alpo (FI, 1999)
Keywords: Betula; ekofysiologia; fotoperiodismi; hybridisaatio; kausivaihtelu; kukinta; lämpösumma; siitepöly; sopeutuminen