spring: male inflorescences of hazelnut, corylus avellana

allergic allergies allergy avellana blooming blossom botanical botany brown bush catkin catkins causes corylus count countryside ends female fertilized fever filbert flora flower flowers foliage forest garden gardening have hay hazel hazelnut hazelnuts herb herbal inflorescences male many natural nature nut nutrition organic outdoor people plant pollen pollination pollinosis reproductive season seed spring suffering their tree twig winter wood yellow