The genus Hypericum contains the following 490 species, according to The Plant List, divided by sections.Hypericum species are found most densely in Europe and parts of the Middle East. They are a rather unusual genus in the fact that Norman Robson created a genus-wide monograph in 1977, dividing the genus into distinct sections that are still used today despite the genus's size A phylogenetic study was completed for Hypericum, showing that the genus Triadenum is likely a clade in Hypericum. It also showed that Thornea is sister to Hypericum and that 60% of the sections of Hypericum are monophyletic.
Adenosepalum Spach contains shrubs, shrublets, and soft herbs. Its species grow to 2.5 meters tall and can be found in most of Europe and parts of Northern Africa.
Adenotrias (Jaub. & Spach) R. Keller contains shrubs and shrublets. Its species grow up to 2 meters tall and are found in West Africa and Eastern Europe.
The species in Androsaemum (Duhamel) Godron grow up to 3 meters tall and are shrubs. They are found in the Middle East and around the Mediterranean.
The species in Arthrophyllum Jaub. & Spach grow to be less than a meter tall. They are found in parts of the Middle East.
Ascyreia Choisy contains shrubs, shrublets, and rarely trees. Most species grow to be 4–5 m tall and can be found across Europe.
Brathys (Mutis ex L.f.) Choisy is one of the largest sections of Hypericum. It contains mainly evergreen trees, shrubs, shrublets, and wiry herbs that grow up to 6 m tall.
Bupleuroides Stef. contains only a single species that is a small perennial herb.
Campylopus Boiss. contains only Hypericum cerastioides.
Campylosporus (Spach) R. Keller
Drosocarpium Spach contains small perennial herbs that are found near the Mediterranean.
Elodeoida N. Robson contains 1 m tall perennial herbs.
Graveolentia N. Robson is a diverse section whose type species is H. graveolens.
Heterophylla N. Robson contains a single shrublets measuring up to 25 cm tall.
Hirtella Stef. contains perennial herbs averaging 80 cm in height.