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Hypericum perforatum, commonly known as St John's wort (sometimes perforate St John's wort or common St John's wort), is a flowering plant in the family Hypericaceae.It is a perennial plant that grows up to 1 metre (3 ft 3 in) tall, with many yellow flowers that have clearly visible black glands around their edges, long stamens (male reproductive organs), and three pistils (female reproductive ...
The beetles Chrysolina quadrigemina, Chrysolina hyperici and the St. John's-wort root borer (Agrilus hyperici) feed on common St. John's-wort (H. perforatum) plants and have been used for biocontrol where the plant has become an invasive weed. [13] Hypericum species are the only known food plants of the caterpillar of the treble-bar, a species ...
Hypericum densiflorum, also known as bushy St. John's wort or dense St. John's wort, is a perennial herb in the flowering plant family Hypericaceae native to North America. The specific epithet densiflorum is Latin , meaning "densely flowered", referring to the many-flowered cymes .
Hypericum punctatum, the spotted St. John's wort, is a perennial herb native to North America. [2] The yellow-flowered herb occurs throughout eastern North America into southern Canada. The process of microsporogenesis carried out by this plant is prone to errors in chromosomal segregation. It has a diploid number of 14 or 16.
Hypericaceae is a plant family in the order Malpighiales, comprising six to nine genera and up to 700 species, and commonly known as the St. John's wort family. Members are found throughout the world apart from extremely cold or dry habitats. Hypericum and Triadenum occur in temperate regions but other genera are mostly tropical.
Hypericum elodes, commonly known as marsh St John's-wort, [3] is a species of flowering plant in the St. John's wort family Hypericaceae. It is native to Western Europe.