Regularity: Regularly occurring
adult of Chrysolina hyperici grazes on flower of Hypericum hirsutum
Remarks: season: early 6-2
Foodplant / open feeder
nocturnal adult of Chrysolina varians grazes on live leaf of Hypericum hirsutum
Remarks: season: 6-10,3-
In Great Britain and/or Ireland:
Foodplant / saprobe
scattered, covered pycnidium of Phomopsis coelomycetous anamorph of Diaporthe picea is saprobic on dead stem of Hypericum hirsutum
Remarks: season: 7
Foodplant / parasite
cleistothecium of Erysiphe hyperici parasitises Hypericum hirsutum
Foodplant / parasite
hypophyllous, caeomoid aecium of Melampsora hypericorum parasitises live leaf of Hypericum hirsutum
Remarks: season: 5-10
Foodplant / spot causer
mainly epiphyllous, brown pycnidium of Septoria coelomycetous anamorph of Septoria hyperici causes spots on fading leaf of Hypericum hirsutum
Remarks: season: 8-10
Molecular Biology and Genetics
Barcode data: Hypericum hirsutum
Statistics of barcoding coverage: Hypericum hirsutum
Public Records: 3
Specimens with Barcodes: 4
Species With Barcodes: 1
National NatureServe Conservation Status
Rounded National Status Rank: NNA - Not Applicable
Hypericum hirsutum is a downy perennial plant that grows to two or three feet. It has erect stems and opposite pairs of untoothed, elongated oval leaves with translucent glandular dots. The terminal inflorescences have many pale yellow flowers. Each has five pointed sepals with stalked black dots on the margins. The five petals also may have black dots and the many stamens are in bundles. Hairy St John's wort is very similar to common St John's wort (H. perforatum) but can be distinguished by the downy stems and the much longer leaves.
H. hirsutum grows in poor grassland on well-drained clay, limy and chalky soils. It is often found at the edges of woodland, on river banks and roadside verges. It is found throughout Western Europe, and in the United Kingdom it flowers from July to August.
- McKlintock, D. and R. S. R. Fitter. The Pocket Guide to Wild Flowers. (1956) Collins, London. P29.
- Hypericum hirsutum Flora Europaea. Retrieved 2011-09-13.
- Hypericum hirsutum Emorsgate Seeds. Retrieved 2011-09-13.
- Miquelianin and other polyphenols from Hypericum hirsutum. G. M. Kitanov, Chemistry of Natural Compounds, Volume 24, Number 1, pages 119-120, doi:10.1007/BF00597593
Names and Taxonomy
Comments: This Eurasian species has been recently found in Toronto, Ontario, Canada for its first record in North America. The common name 'Hairy St. John's-wort' is very much is use as a vernacular in Europe is also used by Hypericum setosum in North America.
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