Alnus

Alnus is a genus of about 35 deciduous and evergreen tree species belonging to the birch family (Betulaceae). Commonly known as alders, these trees are characterized by their conical or rounded shape, smooth bark (often with lenticels), and toothed, alternate leaves. Alders typically thrive in moist environments, such as along riverbanks, wetlands, and other areas with access to water. A key feature is their ability to fix nitrogen in the soil through a symbiotic relationship with Frankia bacteria. This makes them important pioneer species and soil improvers, making them valuable for ecological restoration and forestry. Alder trees also have distinctive cone-like female catkins that persist through winter and shed their seeds in spring. The wood is often used for carpentry and woodworking as it's a medium-density hardwood.

Alnus meaning with examples

• The riparian buffer along the creek was dominated by alnus glutinosa, the common alder. Its presence helped stabilize the banks and provide habitat.
• Forest managers carefully monitored the health of the alnus rubra population, knowing its importance in creating suitable conditions for conifer seedlings to establish.
• When analyzing soil samples, scientists noted the high nitrogen content in areas populated by alnus, confirming the tree's nitrogen-fixing capabilities.
• The skilled woodworker chose the wood from an alnus incana tree due to its attractive grain pattern and ease of use for carving intricate designs.
• During the spring, the small seeds shed from the old, cone-like catkins of the alnus serrulata are dispersed by the wind to help populate new environments.