acer negundo box elder, boxelder maple, ash-leaved maple flower blooming in early spring

acer acernegundo allergen american ash background bloom blooming blossom botanical botany boxelder branch bud closeup color deciduous elder flora floral flower foliage forest fresh garden green growth leaf leaved life macro maple natural nature negundo new outdoor petal plant pollen season seed spring springtime sprout stem tree twig white yellow young