Anacamptis pyramidalis (L.) L.C.M.Rich. var. dunensis Londo, Kreutz et Slings nov. var. (Duinhondskruid), een nieuw taxon voor de Nederlandse flora

Anacamptis pyramidalis (L.) L.C.M.Rich. var. dunensis Londo, Kreutz & Slings nov. var. (Dune pyramidal orchid), a new taxon for the Dutch flora In the Netherlands, Anacamptis pyramidalis (L.) L.C.M.Rich. is a rare species, which occurs in the calcareous grasslands in the Province of Zuid-Limburg and in the calcareous coastal dunes. It is striking that flowering in the dunes is later than inland. Also in other aspects the dune type deviates from the type of the calcareous grasslands such as the colour of the flowers and the shape of the spike. When dune type plants were transplanted to an inland location, the characteristics of the dune type were maintained. These features are therefore not an effect of differences in climate. A number of varieties of Anacamptis pyramidalis has been described. None of these varieties correspond with the dune type and nowhere within the species range such a late flowering time is found. Here, the dune type is described as a new variety: Anacamptis pyramidalis var. dunensis (Dune pyramidal orchid). The variety is characterized by a later flowering time, shorter plants with a mostly shorter more spherical spike and by on an average lighter (light purple pink) coloured flowers. Another character is the more or less S-curved stem.