''Hypericum tetrapterum'' (
syn. ''H. quadrangulum'') is a
herbaceous perennial plant
A perennial plant or simply perennial is a plant that lives more than two years. The term ('' per-'' + '' -ennial'', "through the years") is often used to differentiate a plant from shorter-lived annuals and biennials. The term is also wide ...
species in the
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 ...
family
Hypericaceae
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. '' ...
. Its common names include St. Peter's wort, Peterwort, square stemmed St. John's wort, and square stalked St. John's wort.
Description
''Hypericum tetrapterum'' is a rhizomatous,
glabrous
Glabrousness (from the Latin '' glaber'' meaning "bald", "hairless", "shaved", "smooth") is the technical term for a lack of hair, down, setae, trichomes or other such covering. A glabrous surface may be a natural characteristic of all or part of ...
perennial plant growing up to in height.
[ The flowers are produced in flowerheads of 10–30 flowers (up to 70), each flower in diameter with 5 pale yellow petals and 5 sepals.][ There may be black glands on the petals and sepals, as well as on the leaves.][
]
Distribution and habitat
''Hypericum tetrapterum'' is common in damp habitats such as marshes, streamsides, open ditches, meadows, and springs throughout Europe.[
]
References
{{Taxonbar, from=Q159259
tetrapterum
Flora of Europe
Plants described in 1828