Hypericum gymnanthum

Hypericum gymnanthum
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Malpighiales
Family: Hypericaceae
Genus: Hypericum
Section: H. sect. Trigynobrathys
Subsection: H. subsect. Knifa
Species:
H. gymnanthum
Binomial name
Hypericum gymnanthum
Engelm. & Gray[1]
Synonyms[1]
  • Hypericum canadense var. cardiophyllum R.Keller
  • Hypericum mutilum var. gymnanthum (Engelm. & A.Gray) A.Gray
  • Sarothra gymnantha (Engelm. & A.Gray) Y.Kimura

Hypericum gymnanthum, the small-flowered St. John's wort[2] or clasping leaf St. John's wort,[3] is a species of flowering plant in the St. John's wort family Hypericaceae. It was first formally described in 1845.[4]

Description

H. gymnanthum ranges in height from 0.3 to 1 meters (approximately 1 to 3 feet) in height. Each yellow flower has five petals, each being 3 to 6 millimeters long.[5][6] Its lower leaves are significantly smaller than its upper leaves, which are 1.5 centimeters long and 1 centimeter wide.[6]

Distribution and Habitat

This species' range encompasses the eastern United States, from Florida to New York, and it also occurs in Guatemala.[7][8] It has been introduced to Poland.[7]

It is commonly found in wet habitats such as sinkhole ponds, wet pine flatwoods, bogs, swales, and pine savannas.[9][10] The United States Department of Agriculture classifies H. gymnanthum as a facultative wetland species.[8]

References

  1. ^ a b "Hypericum gymnanthum Engelm. & Gray". Plants of the World Online. Royal Botanical Gardens Kew. Retrieved 20 December 2018.
  2. ^ Robson, Norman K. B. (2015). "Hypericum gymnanthum". 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 20 December 2018 – via eFloras.org, Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
  3. ^ "Hypericum gymnanthum Species Page". floraofalabama.org. APA: Alabama Plant Atlas. Retrieved 20 December 2018.
  4. ^ "Hypericum gymnanthum Engelm. & Gray". ipni.org. International Plant Names Index. Retrieved 20 December 2018.
  5. ^ "Lady Bird Johnson Wildflower Center - The University of Texas at Austin". www.wildflower.org. Retrieved 2025-08-01.
  6. ^ a b Godfrey, Robert K. (1981). Aquatic and Wetland Plants of Southeastern United States: Dicotyledons. Jean W. Wooten. Athens: University of Georgia Press. ISBN 978-0-8203-0532-5.
  7. ^ a b "Hypericum gymnanthum Descriptions". hypericum.myspecies.info. Retrieved 20 December 2018.
  8. ^ a b "USDA Plants Database". plants.usda.gov. Retrieved 2025-08-01.
  9. ^ Weakley, A. S. (2015). Flora of the Southern and Mid-Atlantic States. Chapel Hill, NC, University of North Carolina Herbarium.
  10. ^ "NatureServe Explorer 2.0". explorer.natureserve.org. Retrieved 2025-08-01.


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