jesion

Jesion, scientifically known as Fraxinus, is a genus of flowering plants in the olive family, Oleaceae. These deciduous trees are widespread across the Northern Hemisphere, inhabiting temperate and subtropical regions. Jesion species are recognized for their pinnately compound leaves, meaning multiple leaflets attach to a central stem. The trees typically produce male and female flowers, though some species are dioecious, with individual trees bearing only one sex of flower. Their fruit is a samara, a winged seed that aids in wind dispersal.

Several species of jesion are notable. Fraxinus excelsior, commonly called the European ash, is a large tree found throughout Europe. Fraxinus americana, or white ash, is a significant hardwood species in North America. Fraxinus pennsylvanica, or green ash, is also common in North America and is often used for landscaping and reforestation.

Jesion wood is highly valued for its strength, elasticity, and attractive grain. It is commonly used in the manufacture of furniture, tools, sports equipment, and musical instruments. Unfortunately, many jesion populations are currently threatened by pests like the emerald ash borer, which has caused widespread mortality in North America, and ash dieback disease in Europe. Conservation efforts are underway to protect these important trees.