As a result of nature management measures a number of rare and endangered species reappeared, often after many decades of absence on the site: Apium inundatum, Anagallis tenella, Cicendia filiformis, Echinodorus repens, Eleocharis quinqueflora, Juncus tenageia, Ludwigia palustris, Myriophyllum alterniflorum, Pilularia globulifera and Viola persicifolia; the latest news (summer 1997) being the rediscovery of the presumably extinct Juncus capitatus. New are the alien species Nonea lutea, Salix udensis, and Typha minima. Field botanists are urged to collect more herbarium material and to improve the quality of their collections.