This attractive multi-year Caritas charity series from Luxembourg features exquisitely illustrated European wildflowers and orchids, issued between 1975 and 1977. Printed by Courvoisier in vibrant, finely detailed photogravure, each stamp combines botanical precision with elegant color backgrounds. The series includes species such as Scilla bifolia, Gentiana ciliata, Narcissus pseudonarcissus, Anemone pulsatilla, Convallaria majalis, Ophrys apifera, Daphne mezereum, Dactylorhiza maculata, Ophrys fuciflora, and Anacamptis pyramidalis.

The “+” denominations indicate surtaxes benefiting Caritas charitable programs, making this both a thematic flora collection and a social welfare issue. With striking pastel tones and scientific naming along the margins, these stamps are highly desirable for flora, orchid, and charity stamp collectors. A visually cohesive and educational set ideal for botanical thematic exhibits.