''Melampyrum nemorosum'' is an

herbaceous Herbaceous plants are vascular plants that have no persistent woody stems above ground. This broad category of plants includes many perennials, and nearly all annuals and biennials. Definitions of "herb" and "herbaceous" The fourth edition of t ...

flowering plant Flowering plants are plants that bear flowers and fruits, and form the clade Angiospermae (), commonly called angiosperms. The term "angiosperm" is derived from the Greek words ('container, vessel') and ('seed'), and refers to those plants th ...

in the family

Orobanchaceae Orobanchaceae, the broomrapes, is a family of mostly parasitic plants of the order Lamiales, with about 90 genera and more than 2000 species. Many of these genera (e.g., ''Pedicularis'', ''Rhinanthus'', ''Striga'') were formerly included in the ...

. It is native to

Europe Europe is a large peninsula conventionally considered a continent in its own right because of its great physical size and the weight of its history and traditions. Europe is also considered a Continent#Subcontinents, subcontinent of Eurasia ...

. In

Sweden Sweden, formally the Kingdom of Sweden,The United Nations Group of Experts on Geographical Names states that the country's formal name is the Kingdom of SwedenUNGEGN World Geographical Names, Sweden./ref> is a Nordic country located on ...

it is called ''natt och dag''. (''Night and Day'')''Melampyrum nemorosum''.
Invasive Species Compendium. CABI. In

Russia Russia (, , ), or the Russian Federation, is a List of transcontinental countries, transcontinental country spanning Eastern Europe and North Asia, Northern Asia. It is the List of countries and dependencies by area, largest country in the ...

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 ''Coleosporium tussilaginis'' is a species of rust fungus in the family Coleosporiaceae. It is a plant pathogen. It is known to infect ''Campanula rotundifolia'', on which it produces urediniospores and teliospore Teliospore (sometimes called ...

'' 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 ''Cronartium'' is a genus of rust fungi in the family Cronartiaceae. They are heteroecious rusts with two alternating hosts, typically a pine and a flowering plant, and up to five spore stages. Many of the species are plant diseases of major ec ...

'' with the associated uredium and

telium Telium, plural telia, are structures produced by rust fungi as part of the reproductive cycle. They are typically yellow or orange drying to brown or black and are exclusively a mechanism for the release of teliospores which are released by wind o ...

.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 Melampyrum nemorosum - Keila.jpg, Flower Atlas_roslin_pl_Pszeniec_gajowy_9408_7395.jpg, Flowers in yellow and red contrast the

purple Purple is any of a variety of colors with hue between red and blue. In the RGB color model used in computer and television screens, purples are produced by mixing red and blue light. In the RYB color model historically used by painters, pu ...

top leaves

References

External links

Orobanchaceae Flora of Europe Plants described in 1753 Taxa named by Carl Linnaeus {{Orobanchaceae-stub