japanese knotweed (reynoutria japonica). inflorescence detail closeup

asian knotweed belarus flora fallopia japonica japanese polygonaceae reynoutria anther black background botanical science botany closeup cyme decurrent filament focus stacking functionally unisexual flower funnelshaped keel macro nature panicle papilliform hair perianth segment plants rachilla rhachis stamen virtual herbarium staminode stigma abortive ovary