Wood cow-wheathttps://www.biolib.cz/en/taxon/id40893/ (Melampyrum nemorosum) is an herbaceous flowering plant in the family Orobanchaceae. It is native to Europe. In Sweden it is called natt och dag (Night and Day).Melampyrum nemorosum. Invasive Species Compendium. CABI. In Russia it is called Ivan-da-Marya (Ivan and Maria), a Christianisation of the traditional Slavic Kupalo-da-Mavka (Kupalo-and-Mavka).
This is an annual plant. The new leaves are blue, turning green as they mature. They are usually toothed at the bases.
This plant is a host to the rust fungus Coleosporium melampyri Peter Zwetko: Die Rostpilze Österreichs. Supplement und Wirt-Parasit-Verzeichnis zur 2. Auflage des Catalogus Florae Austriae, III. Teil, Heft 1, Uredinales. (PDF; 1,8 MB). und Cronartium flaccidum with the associated uredium and telium.Kaitera, J. and H. Nuorteva. (2003). Cronartium flaccidum produces uredinia and telia on Melampyrum nemorosum and on Finnish Vincetoxicum hirundinaria. Forest Pathology 33: 205–213. doi: 10.1046/j.1439-0329.2003.00321.x
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