Lavandula angustifolia (Miller, 1771) common name, English lavender, though oddly not indigenous to England, rather to the Western Mediterranean. A hybrid of this plant is the lavender that blankets Provence. The oil is deeply and delightfully soporifc as well as a very effective insecticide for killing the larvae of moths such as Tineola bisselliella that consume textiles, hence its ubiquity in linen closets of the past.
The image is by Franz Eugen Köhler, Köhler’s Medizinal-Pflanzen, 1897
I only wish the octogenarians I encounter in this glorious future would use good old fashioned lavender oil to preserve their clothing as opposed to those absolutely loathesome cakes of 1,4-dichlorobenzene, the fumes of which are enough to send me back to the grave.