Hypericum denticulatum, the coppery St. John's Wort, is a perennial herb in the flowering plant family Hypericaceae.

The large disjunction in the distribution of the two herbs is most likely the result of ancient long distance dispersal.

The H. denticulatum complex has typically been treated as comprising two taxa, regarded in the past as separate species, two varieties, and most recently two subspecies.

The last two varieties encompassed the former species Hypericum virgatum which had narrower leaves and sepals.

[3] The specific epithet denticulatum means "small-toothed", referring to the marginal teeth on the petals.

The slender, herbaceous stems are strict or ascending, usually clumped together and arising from surculose bases.

The four-angled, densely dotted stems reach 25–65 cm (9.8–25.6 in) in height and have four-lined internodes measuring 8–47 mm (0.31–1.85 in).

The nearly erect leaves are ovate, oval, or oboval, have acute tips, and are rounded at their sessile bases.

The terminal, pyramidal to corymbiform inflorescences bear up to 25 scattered racemose flowers on their ascending branches.

The three styles, measuring 2–4 mm (0.079–0.157 in) long, are distinct, short, and have capitate stigmas.

[4][3] H. denticulatum closely resembles Hypericum erythreae but can be distinguished by its shorter stems and more dense foliage.

denticulatum can be distinguished by its shorter stature, growing 0.2–0.7 m (7.9 in – 2 ft 3.6 in) tall, and by its lower internodes.

It can be found in moist ditches, pine barrens, and prairies at elevations between 0–400 m (0–1,312 ft).

[3] Hypericum denticulatum grows in sandy or argillaceous shores, swamps, ditches, gravelly hills, and pine barrens at altitudes between 0–700 m (0–2,297 ft).