Hypericum myrtifolium

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Common name: Myrtle-leaf St. John's-wort[1]; Polebark St. John's-wort

Hypericum myrtifolium
Hypericum myrtifolium SEF.jpg
Photo by the Southeastern Flora Plant Database
Scientific classification
Kingdom: Plantae
Division: Magnoliophyta - Flowering plants
Class: Magnoliopsida - Dicots
Order: Theales
Family: Clusiaceae
Genus: Hypericum
Species: H. myrtifolium
Binomial name
Hypericum myrtifolium
Natural range of Hypericum myrtifolium from USDA NRCS Plants Database.

Taxonomic Notes

Synonyms: none.[1]

Varieties: none.[1]


H. myrtifolium is a native perennial shrub that is a member of the Clusiaceae family.[2] It is most recognizable by its clasping leaves, which are usually glaucous.[3]


H. myrtifolium is endemic to the southeastern Coastal Plain, found mainly in Florida, and sparingly throughout southern Alabama, Georgia, and Mississippi.[2][4]



H. myrtifolium frequents pond-adjacent habitats, fresh-waterbodies. and the occasional marsh.[5][4] Other natural communities include the sandhills and flatwoods.[6] More specifically, H. myrtifolium can be found in dry loamy sands of open pine woodlands, moist loams of pine woodland swales, sand pine stands, and shaded swamps.[7] It is considered an indicator species of the peninsula savannas in Florida.[8]

Associated species include Hypericum harperi.[7]


H. myrtifolium commonly flowers from April until June.[9] It has been observed flowering from May to July as well as October to December.[10][7].

Fire ecology

This species is commonly found in fire-dependent pineland habitats.[8]

Conservation, cultivation, and restoration

As it is uncommon in its range and depends on endangered habitat types, Hypericum myrtifolium is listed as G4. It is also considered imperiled in Mississippi.[11]

Cultural use

Photo Gallery

References and notes

  1. 1.0 1.1 1.2 Weakley, A.S. 2015. Flora of the southern and mid-atlantic states. Working Draft of 21 May 2015. University of North Carolina at Chapel Hill, Chapel Hill, North Carolina.
  2. 2.0 2.1 USDA Plants Database URL: https://plants.usda.gov/core/profile?symbol=HYMY
  3. Carr, L. G. (1940). "Further notes on coastal floral elements in the bogs of Augusta County, Virginia." Rhodora 42(495): 86-93.
  4. 4.0 4.1 Weakley, A. S. (2015). Flora of the Southern and Mid-Atlantic States. Chapel Hill, NC, University of North Carolina Herbarium.
  5. Hilmon, J. B. (1964). "Plants of the Caloosa Experimental Range " U.S. Forest Service Research Paper SE-12
  6. Platt, W. J., Gregory W. Evans, and Mary M. Davis (1988). "Effects of Fires Season on Flowering of Forbs and Shurbs in Longleaf Pine Forests." Oecologia 76(3): 353-363.
  7. 7.0 7.1 7.2 Florida State University Robert K. Godfrey Herbarium database. URL: http://herbarium.bio.fsu.edu. Last accessed: June 2018. Collectors: Loran C. Anderson, Wilson Baker, R. A. Norris, Robert K. Godfrey, R. Komarek, M. Davis, J. M. Kane, Cecil R. Slaughterm and R. Kral. States and counties: Florida: Leon, Wakulla, Duval, and Madison. Georgia: Thomas and Clinch.
  8. 8.0 8.1 Carr, S. C., et al. (2010). "A Vegetation Classification of Fire-Dependent Pinelands of Florida." Castanea 75(2): 153-189.
  9. [[1]] Lady Bird Johnson Wildflower Center. Accessed: May 28, 2019
  10. Nelson, G. PanFlora: Plant data for the eastern United States with emphasis on the Southeastern Coastal Plains, Florida, and the Florida Panhandle. www.gilnelson.com/PanFlora/ Accessed: 22 MAY 2018
  11. [[2]] NatureServe Explorer. Accessed: May 28, 2019