Issued by Luxembourg in 1976, this attractive Caritas charity set highlights native European wildflowers rendered in detailed botanical illustration. The stamps depict Ophrys fuciflora (Bee Orchid), Scilla bifolia (Alpine Squill), and Gentiana ciliata (Fringed Gentian), combining vibrant colors with scientific accuracy. As semi-postal issues, each stamp carries an added surtax to support charitable welfare programs under the Caritas initiative. Printed by Courvoisier, the series is admired by both thematic flower collectors and European charity stamp specialists. Well-centered mint examples with bright original colors are especially desirable for botanical thematic collections.