lemon balm (melissa officinalis). flower closeup

belarus flora labiatae lamiaceae melissa officinalis androecium anther anthesis bilabiate black background botanical science botany calyx campanulate closeup corolla curved didynamous dilated eglandular hair filament flower focus stacking glandular gynoecium indumentum lemon balm macro nature pedicel petal plants pollen sepal stamen stigma style tube virtual herbarium lateral view