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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 underside of the leaves is a blue-green color and in the fall, the leaves take on a purple color. [5] The flowers are 3–5 cm in diameter, a rich yellow, with five petals and numerous yellow stamens. Its flowers can be described as "rose-like" and tend to be single or in units of two or three, [4] flowering in June to September. [6]
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 mutilum is a species of St. John's wort known by the common name dwarf St. John's wort. It is native to parts of North America and is present in other parts as an introduced species . It is an annual or perennial herb taking a multibranched erect form up to about 60 centimeters tall.
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.
Chrysolina hyperici is most often known in English by the common names "St. Johnswort Beetle", "Saint John's Wort Beetle" or close variations. [3] In the United States C. hyperici is also known by the common name "klamathweed beetle" from one of the common names of Hypericum perforatum.
Triadenum fraseri, commonly known as bog St. John's wort, Fraser's St. John's wort, and Fraser's marsh St. John's wort, is a perennial flowering plant in the family Hypericaceae that grows in wetlands of Canada and the northern United States. [2] [3] [4] It is named after John Fraser (1750–1811), a Scottish botanist and widely travelled plant ...
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 .