Germination of four Central European Bolboschoenus species (B. yagara, B. koshewnikowii, B. maritimus and B. laticarpus) was studied. The need for stratification and the influence of temperature and water regime on seed germination were tested in the laboratory. Cold wet stratification in the laboratory as well aswater stratification in the field enhanced the germination of all species. Germination was facilitated by increasing stratification length, but differed between species. Field stratification in water improved the germination of all species compared to stratification in soil. Germination requirements of the four Bolboschoenus species, despite the broader ecological amplitude of B. laticarpus, were similar. The best germination occurred after four months of field stratification in cold water. All species germinated best in aerobic conditions when the day/night temperature fluctuations were high (30/10 °C). These conditions correspond to those occurring where the seedlings tend to establish themselves in the field: exposed pond bottoms or wet soil in field depressions.
Ve střední Evropě se vyskytují čtyři druhy kamyšníků (Bolboschoenus), které byli dříve považovány za jediný široce definovaný druh kamyšník přímořský (B. maritimus). Současná klasifikace spočívá v morfologii květenství a hlavně tvaru a anatomii nažek. Kamyšník širokoplodý (B. laticarpus) je na základě jeho přechodných znaků, chromozomového počtu a ekologie považován za hybridní druh. Taxonomická klasifikace středoevropských kamyšníků byla ověřena molekulární analýzou a rovněž se potvrdil i hybridní původ kamyšníku širokoplodého, jehož rodiče jsou kamyšník vrcholičnatý (B. yagara) a kamyšník polní (B. planiculmis)., Four taxa of the genus Bolboschoenus (Cyperaceae), formerly included in the broadly conceived species B. maritimus are distributed in Central Europe. Their current determination is based on the morphological characters of the inflorescence and especially the shape and anatomy of achenes. On the basis of intermediate morphology, chromosome numbers and ecological amplitude, B. laticarpus has been supposed to be a hybridogenous taxon. Taxonomical classification of Central European Bolboschoenus species was verified by genetic analyses and hybrid origin of B. laticarpus was verified, with the parentage B. yagara × B. planiculmis., and Soňa Píšová, Zdenka Hroudová, Tomáš Fér, Michal Ducháček, Petr Zákravský.