Species of flowering plant in the St John's wort family Hypericaceae
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Hypericum tenuifolium, known as Atlantic St. John's-wort and sandhill St. John's-wort, is a species of flowering plant in the St. John's wort family, Hypericaceae. It is native to the Southeastern United States. 
Description.
Atlantic St. John's-wort is a small, spreading shrub, growing tall and forming mats. The leaves are very narrow, hence its name "tenuifolium" (from la " tenuis" 'thin' and " folium" 'leaf'), and are only broad and long, with rounded tips and revolute margins. The flowerheads are narrowly cylindric, producing 1-7 flowers. Each flower is 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.
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. Its habitat includes dry, open, sandy areas such as pine flatwoods, pine savannas, and sandhills.
References.
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