Hypericaceae

Great St. Johnswort

Hypericum ascyron L.

Family: Hypericaceae
Genus: Hypericum

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Great St. Johnswort (Hypericum ascyron) — FlowerPhoto: Roman A. Lagazyuk (Роман А. Лагазюк), CC0, from iNaturalist

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Common names

By language (8)

Azerbaijani: İri dazı
Bulgarian: Голяма звъника
Chinese: 連翹, 黄海棠, 八宝茶, 六安茶, 大叶牛心菜, 大叶金丝桃, 大金雀, 对月草
English: Great St. Johnswort
Japanese: トモエソウ
Korean: 물레나물
Russian: Зверобой большой
Ukrainian: Звіробій великий

Synonyms

Ascyrum sibiricum Poir.
Ascyrum tetragonum Moench
Hypericum ascyron var. genuinum Maxim.
Hypericum parviflorum Salisb.
Roscyna ascyron (L.) Y. Kimura
Roscyna gmelinii Spach

Flowers

In flower: July (from 244 flowering iNaturalist observations worldwide)

Characteristics

Growth habit: Forb/herb
Lifespan: Perennial
In the US and Canada: Canada: native, Lower 48 states: native

Photos

FlowerPhoto: Roman A. Lagazyuk (Роман А. Лагазюк), CC0, from iNaturalist
FlowerPhoto: Timofey Shiryaev, CC0, from iNaturalist
FlowerPhoto: aarongunnar, CC BY 4.0, from iNaturalist
FlowerPhoto: pobrito, CC0, from iNaturalist
FruitPhoto: Chase Mathey, CC BY 4.0, from iNaturalist
Photo: Qwert1234, CC BY-SA 3.0, from Wikimedia Commons
Photo: Ryan Heaney, CC BY-SA 4.0, from Pl@ntNet via GBIF
Photo: Alpsdake, CC BY-SA 4.0, from Wikimedia Commons
Photo: Beef, CC BY-SA 4.0, from Pl@ntNet via GBIF
Photo: Roman A. Lagazyuk (Роман А. Лагазюк), CC BY 4.0, from iNaturalist
Photo: Alpsdake, CC BY-SA 4.0, from Wikimedia Commons
Photo: Connor Wood, CC BY-SA 4.0, from Pl@ntNet via GBIF

More in Hypericum

Sources: classification, synonyms from World Flora Online Plant List (2026-06, CC0 1.0); common names, popularity from Wikidata (2026-10-26, CC0 1.0); common names, US characteristics from USDA PLANTS Database (2025-05-29, CC0 1.0). About our plant data.