Blyttia () is a quarterly peer-reviewed scientific journal of botany published by the Norwegian Botanical Association since 1943. It was the successor of the Norsk Botanisk Forenings Meddelelser. The editor-in-chief is Jan Wesenberg. The journal is named after the Norwegian botanists Matthias Numsen Blytt (1789âÂÂ1862) and his son Axel Gudbrand Blytt (1843âÂÂ1898).