polygonum arenastrum family polygonaceae or equal-leaved knotgrass, knotweed, prostrate knotweed, mat grass

annual arenastrum background black bloom blossom botany bouquet bud diversity door environment equal equalleaved family flora floral flower frame garden grass green isolated knotgrass knotweed leaf leaved leaves macro mat natural nature oval ovalleaf petal plant polygonaceae polygonum prostrate stem stone summer weed wiregrass