common whitlowgrass (draba verna). inflorescence detail closeup

belarus flora brassicaceae cruciferae draba verna erophila black background botanical science botany closeup common whitlowgrass early whitlow grass focus stacking macro nailwort nature petal pistil plants pollen sepal shadflower spring stamen vernal virtual herbarium calyx verna inflorescence detail flora: focus-stacked closeups wild cultivated including flowers leaves fruits intended illustrations manuals