of background of dry knotweed herb used in herbal medicine. the concept of herbal treatment. bian xu. the active

medicine illustration natural background nature herbal plant isolate flora organic green botany terry grass knotweed knotgrass pattern abstract light leaf traditional flat carve herb ingredient herbarium flooring leave close health dry chinese food remedy alternative oriental knot medicinal dried yin care asian tea wild folk treatment used concept bian active substance polygoni avicularis herba medicine treatment xu herba