Melampyrum

Species of Melampyrum exhibit a type of variation called pseudoseasonal polymorphism 
(de Soó and Webb 1972). This type of variation is correlated with both the time of germination and flowering, as well as the habitat the plant grows in. These variants demonstrate many different morphologies and create difficulty for recognizing true genetic differences (should any exist). Therefore, no infraspecific taxa are recognized here in our species until further study sorts out phenotypic variation from genetic variation.