oblong, elliptic, lanceolate
June - August
0.2 - 0.9
May be distinguished from the many other species of Hypericum by its papery textured leaves with a clasping base and keeled midnerve that continues into a wing along the stem. The leaves are distinctive with edges that are rolled down. Does not have an articulation at the base of leaf. Leaves not linear.
Seed germination is improved by cold/moist stratification (Steffen 1997).
Not common in Louisiana (see range map) and extremely rare in southeast Texas. Round-pod St. John's wort ranges from Texas to Florida and north to North Carolina (Correll and Johnston 1979).
Savannahs, ditches, and low pinelands, sandy soils.