| Hypericum tetrapetalum | |
|---|---|
| |
Scientific classification 
| |
| 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[2] | |
| |
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]
Description[edit]
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[edit]
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.[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.
- ^ USDA, NRCS (n.d.). "Hypericum tetrapetalum". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. 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.