the male catkin on a willow branch in early spring before leafing

aches acid active ament aspirin bark biofuel biomass bodhisattva branches buddhism buds catkin catkins charcoal china coppices deciduous dioecious energy europe extract festival fever flower forestry honey jewish medical moist nectar osier palm petioles plant qingming remedy roots salicin salicylic salix sallow sap shrub slender soil stipule stoloniferous sukkot sunday tree twig watery willow withe withy