Plants → Magnoliophyta → Magnoliopsida → Malpighiales → Hypericaceae Juss. → Hypericum L. → Hypericum japonicum Thunb.
Ascending annual, herb, 0.02-0.12 m high. Fl. yellow, Oct to Nov. Moist places: pool edges, ephemeral swamps, creek beds.
Beard’s Provinces: Eremaean Province, South-West Province.
IBRA Regions: Carnarvon, Central Ranges, Coolgardie, Geraldton Sandplains, Jarrah Forest, Little Sandy Desert, Murchison, Swan Coastal Plain, Warren.
IBRA Subregions: Eastern Murchison, Geraldton Hills, Lesueur Sandplain, Mann-Musgrave Block, Mardabilla, Northern Jarrah Forest, Perth, Trainor, Warren, Wooramel.
Local Government Areas (LGAs): Busselton, Esperance, Harvey, Irwin, Manjimup, Ngaanyatjarraku, Northampton, Sandstone, Serpentine-Jarrahdale, Toodyay, Upper Gascoyne, Victoria Plains, West Arthur, Wiluna.
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Western Australian Herbarium (1998–). FloraBase—the Western Australian Flora. Department of Biodiversity, Conservation and Attractions. https://florabase.dpaw.wa.gov.au/