Hypericum tetrapetalum

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Hypericum tetrapetalum
Hypericum tetrapetalum.jpg
Status TNC G5.svg
Secure  (NatureServe) [1]
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Malpighiales
Family: Hypericaceae
Genus: Hypericum
Section: H. sect. Myriandra
Subsection: H. subsect. Ascyrum
Species:
H. tetrapetalum
Binomial name
Hypericum tetrapetalum
Synonyms [3]
  • Ascyrum amplexicauleMichx.
  • Ascyrum cubenseGriseb.
  • Ascyrum tetrapetalum(Lam.) Vail

Hypericum tetrapetalum, the fourpetal St. Johnswort, [4] is a species of flowering plant in the St. John's wort family, Hypericaceae. [5] It is found in the Southeastern United States and Cuba. [5] It was first described by Jean-Baptiste Lamarck in 1797. [2] [3]

Contents

Description

Fourpetal St. John's wort flower Fourpetal St. Johns-wort (Hypericum tetrapetalum) (6316227601).jpg
Fourpetal St. John's wort flower

Fourpetal St. Johnswort is a perennial herb or small shrub with a woody base, growing 20–100 cm (7.9–39.4 in) tall. Young stems are two- or four-lined, becoming two-lined or terete as they age. The leaves are oblong to triangular-ovate, 5–35 mm (0.20–1.38 in) long, 4–15 mm (0.16–0.59 in) across, with heart-shaped, clasping bases. The terminal flowerheads produce one to three flowers, each flower 20–30 mm (0.79–1.18 in) in diameter with 4 bright yellow petals and about 100 stamens. It produces flowers throughout most of the year. [6] [7] The capsules are three-parted. [6]

It is distinguished from the closely related Hypericum crux-andreae by its broader leaves with clasping bases. [6] Their distribution overlaps in southern Georgia and northern Florida, but apparent hybrids have not been observed. [5]

Distribution and habitat

In the United States, H. tetrapetalum is found in Alabama, Georgia, and Florida. It is also found in western Cuba.

H. tetrapetalum occurs in wet pinelands and ditches in sandy soil. [6] [5]

References

  1. ↑ "Hypericum tetrapetalum". NatureServe Explorer. Retrieved 8 June 2025.
  2. 1 2 "Hypericum tetrapetalum Lam". ipni.org. International Plant Names Index. Retrieved 2018-11-04.
  3. 1 2 "Hypericum tetrapetalum Lam". Plants of the World Online. Royal Botanical Gardens Kew. Retrieved 2018-11-04.
  4. ↑ NRCS. "Hypericum tetrapetalum". PLANTS Database. United States Department of Agriculture (USDA). Retrieved 2018-11-04.
  5. 1 2 3 4 "Hypericum tetrapetalum Lam. Descriptions". hypericum.myspecies.info. Retrieved 2018-11-04.
  6. 1 2 3 4 Robson, Norman K. B. (2015). "Hypericum tetrapetalum". In Flora of North America Editorial Committee (ed.). Flora of North America North of Mexico (FNA). Vol. 6. New York and Oxford: Oxford University Press. Retrieved 2018-11-04– via eFloras.org, Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
  7. ↑ "Hypericum tetrapetalum (Fourpetal St. Johnswort): Plant Phenology". iNaturalist.org. Retrieved 2018-11-04.
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