alnus glutinosa, the common alder, black alder, european alder or just alder. branch with mature female catkins, blooming male

alder allergens allergy alnus background black botany branch brown bush catkin catkins closeup common cones detail european female flora flowers foliage forest glutinosa green grey healing herbal inflorescence isolated leafy medical medicinal medicine natural nature plant pollen season seasonal seed spring time traditional tree twig white wood yellow