Hypericum prolificum Britton Hypericum densiflorum, also known as bushy St. John's wort or dense St. John's wort, is a perennial herb in the flowering plant family Hypericaceae native to North America.

The specific epithet densiflorum is Latin, meaning "densely flowered", referring to the many-flowered cymes.

[2][3] The plant flowers from July to September and fruits from early October to the end of autumn.

It prefers sandy clay loam and occurs from sea level to 1,000 m (3,300 ft) of elevation.

[4][5][6] The shrub occurs throughout the eastern and southern United States though it grows far west as Texas and as far north as New York.