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Hypericum tenuifolium
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. Centrosperma
Species:	H. tenuifolium
Binomial name
	Hypericum tenuifolium; Pursh
Synonyms
	Hypericum coris Walter ; Hypericum fasciculatum var. laxifolium Choisy ; Hypericum galioides var. reductum Svenson ; Hypericum reductum (Svenson) P.B.Adams ;

Hypericum tenuifolium, known as Atlantic St. John's-wort^[3] and sandhill St. John's-wort,^[4] is a species of flowering plant in the St. John's wort family, Hypericaceae. It is native to the Southeastern United States.^[5]

Description

Atlantic St. John's-wort is a small, spreading shrub, growing 10–50 cm (3.9–19.7 in) tall and forming mats.^[5]^[6] The leaves are very narrow, hence its name tenuifolium (from Latin tenuis 'thin' and folium 'leaf'), and are only 0.4–0.8 mm (0.016–0.031 in) broad and 4–11 mm (1⁄8–3⁄8 in) long, with rounded tips and revolute margins. The flowerheads are narrowly cylindric, producing 1-7 flowers. Each flower is 10–14 mm (3⁄8–1⁄2 in) broad with 5 sepals, 5 bright yellow petals, and 50-90 stamens. The ovaries are three-parted, forming cylindric capsule fruits. It flowers in the summer, typically June through September, but sometimes as late as December.^[4]

Distribution and habitat

Hypericum tenuifolium occurs in the Atlantic coastal plain in the southeastern United States, in Alabama, Florida, Georgia, North Carolina, and South Carolina.^[5] Its habitat includes dry, open, sandy areas such as pine flatwoods, pine savannas, and sandhills.^[5]^[4]

References

^ "Hypericum tenuifolium Pursh". ipni.org. International Plant Names Index. Retrieved 2018-10-13.
^ "Hypericum tenuifolium Pursh". Plants of the World Online. Royal Botanical Gardens Kew. Retrieved 2018-10-13.
^ NRCS. "Hypericum tenuifolium". PLANTS Database. United States Department of Agriculture (USDA). Retrieved 2018-10-13.
^ ^a ^b ^c Weakley, Alan S. (2018), Flora of the Southern and Mid-Atlantic States, working draft of 20 August 2018, University of North Carolina Herbarium, North Carolina Botanical Garden, University of North Carolina at Chapel Hill
^ ^a ^b ^c ^d Robson, Norman K. B. (2015). "Hypericum tenuifolium". 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 2018-10-13 – via eFloras.org, Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
^ "Hypericum tenuifolium". hypericum.myspecies.info. Retrieved 2018-10-13.