Hypericaceae
Grassy St. Johnswort
Hypericum gramineum
- Family
- Hypericaceae
- Genus
- Hypericum
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Common names
By language (3)
- Chinese
- 細葉金絲桃, 细叶金丝桃
- English
- Grassy St. Johnswort
- French
- Millepertuis à feuilles de gramen
Synonyms
- Ascyrum involutum Labill.
- Brathys billardierei Spach
- Brathys forsteri Spach
- Hypericum foetidum Hook.f. & Thomson ex Dyer
- Hypericum gramineum var. ericifolium Domin
- Hypericum gramineum var. genuinum Domin
- Hypericum gramineum var. pedicellare (Endl.) Domin
- Hypericum involutum (Labill.) Choisy
- Hypericum japonicum var. australe R.Keller
- Hypericum japonicum var. gramineum (G.Forst.) Maiden & Betche
- Hypericum japonicum var. kainantense Masam.
- Hypericum japonicum var. lanceolatum Y.Kimura
- Hypericum pauciflorum subsp. involutum (Labill.) C.Rodr.Jim.
- Hypericum pedicellare Endl.
- Sarothra graminea (G.Forst.) Y.Kimura
- Sarothra saginoides Y.Kimura
Flowers
- In flower
- September to May (from 567 flowering iNaturalist observations worldwide)
Characteristics
- Growth habit
- Forb/herb
- Lifespan
- Annual, Perennial
- In the US and Canada
- Hawaii: introduced
Photos
FlowerPhoto: Lucas Christofides, CC BY 4.0, from iNaturalist 
FlowerPhoto: Cheng-Te Hsu, CC BY 4.0, from iNaturalist 
FlowerPhoto: Richard Fuller, CC0, from iNaturalist 
FlowerPhoto: Max Campbell, CC BY 4.0, from iNaturalist 
Photo: James Booth, CC BY-SA 2.5, from Wikimedia Commons 
Photo: Lucas Christofides, CC BY 4.0, from iNaturalist 
Photo: Donald Hobern from Canberra, Australia, CC BY 2.0, from Wikimedia Commons 
Photo: Isaiah Findley, CC0, from iNaturalist 
Photo: Donald Hobern from Canberra, Australia, CC BY 2.0, from Wikimedia Commons 
Photo: Donald Hobern from Canberra, Australia, CC BY 2.0, from Wikimedia Commons 
Photo: Donald Hobern from Canberra, Australia, CC BY 2.0, from Wikimedia Commons 
Photo: Nathan Aaron, CC BY 4.0, from iNaturalist
More in Hypericum
- Common St. JohnswortHypericum perforatumHypericaceae
- Spotted St. JohnswortHypericum maculatumHypericaceae
- Sweet-amberHypericum androsaemumHypericaceae
- Hairy St John's-wortHypericum hirsutumHypericaceae
- Trailing St. JohnswortHypericum humifusumHypericaceae
- Mountain St. John's WortHypericum montanumHypericaceae
- PeterwortHypericum tetrapterumHypericaceae
- Aaron's beardHypericum calycinumHypericaceae
- Slender St John's-wortHypericum pulchrumHypericaceae
- Goat St John's wortHypericum hircinumHypericaceae
- Goldencup St. John's wortHypericum patulumHypericaceae
- Hypericum triquetrifoliumHypericaceae
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.