Hypericum tetrapetalum, the fourpetal St. Johnswort,[3] is a species of flowering plant in the St. John's wort family, Hypericaceae.[4] It is found in the Southeastern United States and Cuba.[4] It was first described by Jean-Baptiste Lamarck in 1797.[1][2]
| Hypericum tetrapetalum | |
|---|---|
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Scientific classification 
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| 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
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| Binomial name | |
| Hypericum tetrapetalum | |
| Synonyms[2] | |
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Description
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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.[5][6] The capsules are three-parted.[5]
It is distinguished from the closely related Hypericum crux-andreae by its broader leaves with clasping bases.[5] Their distribution overlaps in southern Georgia and northern Florida, but apparent hybrids have not been observed.[4]
Distribution and habitat
editIn 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.[5][4]
References
edit- ^ a b "Hypericum tetrapetalum Lam". ipni.org. International Plant Names Index. Retrieved 2018-11-04.
- ^ a b "Hypericum tetrapetalum Lam". Plants of the World Online. Royal Botanical Gardens Kew. Retrieved 2018-11-04.
- ^ NRCS. "Hypericum tetrapetalum". PLANTS Database. United States Department of Agriculture (USDA). Retrieved 2018-11-04.
- ^ a b c d "Hypericum tetrapetalum Lam. Descriptions". hypericum.myspecies.info. Retrieved 2018-11-04.
- ^ a b c d 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.
- ^ "Hypericum tetrapetalum (Fourpetal St. Johnswort): Plant Phenology". iNaturalist.org. Retrieved 2018-11-04.