lemon balm (melissa officinalis). flower closeup

androecium anther anthesis axillary bidentate lip bilabiate calyx corolla tube filament flattened upper flower gynoecium inflorescence lateral view pedicel petal pistil pollen sepal stamen stigma style threelobed lower tridentate twolipped verticillaster labiatae lamiaceae melissa officinalis lemon balm officinalis closeup virtual herbarium belarus flora: focus-stacked closeups wild cultivated plants including flowers leaves fruits intended illustrations botanical manuals