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Hypericaceae
Hypericum

not marked as a favorite taxon *Hypericum perforatum Linnaeus ssp. perforatum. Common name: European St. John’s-wort, Klamath-weed. Phenology: Jun-Sep. Habitat: Fields, pastures, roadsides, woodland borders. Distribution: Native of Eurasia. See Duncan (1985) for documentation for GA.

Glossary (beta!)

Section: Hypericum.

Origin/Endemic status: Eurasia

Taxonomy Comments: Two other subspecies are recognized for e. Asia and c. Asia.

Synonymy ⓘ: = Can, FNA6, NE, NY, POWO, Robson (2006); = Hypericum perforatum L. — Ar, C, F, G, GrPl, Il, K4, Mi, Mo2, NcTx, NS, NSProv, Pa, RAB, S, S13, Tat, Tn, Va, W, WV, Adams (1973). Basionym: Hypericum perforatum L. 1753

Links to other floras: = Hypericum perforatum ssp. perforatum - FNA6

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Wetland Indicator Status:

  • Atlantic and Gulf Coastal Plain: FACU
  • Eastern Mountains and Piedmont: FAC
  • Great Plains: UPL
  • Midwest: FACU
  • Northcentral & Northeast: UPL

Heliophily ⓘ: 9

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image #1 of Hypericum perforatum ssp. perforatum© Erik Danielson source | Original Image ⭷
image #2 of Hypericum perforatum ssp. perforatum© Sequoia Janirella Wrens, some rights reserved (CC BY-NC), uploaded by Sequoia Janirella Wrens source CC-BY-NC, permission granted to NCBG | Original Image ⭷
image #3 of Hypericum perforatum ssp. perforatum© Sequoia Janirella Wrens, some rights reserved (CC BY-NC), uploaded by Sequoia Janirella Wrens source CC-BY-NC, permission granted to NCBG | Original Image ⭷
image #4 of Hypericum perforatum ssp. perforatum© Aidan Campos source | Original Image ⭷
image #5 of Hypericum perforatum ssp. perforatum© Bruce A. Sorrie | Original Image ⭷
image #6 of Hypericum perforatum ssp. perforatum© Sequoia Janirella Wrens, some rights reserved (CC BY-NC), uploaded by Sequoia Janirella Wrens source CC-BY-NC, permission granted to NCBG | Original Image ⭷
image #7 of Hypericum perforatum ssp. perforatum© Bruce A. Sorrie | Original Image ⭷
image #8 of Hypericum perforatum ssp. perforatum© Richard & Teresa Ware CC-BY-NC, permission granted to NCBG | Original Image ⭷
image #9 of Hypericum perforatum ssp. perforatum© Richard & Teresa Ware CC-BY-NC, permission granted to NCBG | Original Image ⭷
image #10 of Hypericum perforatum ssp. perforatum© Erik Danielson source | Original Image ⭷
image #11 of Hypericum perforatum ssp. perforatum© Erik Danielson source | Original Image ⭷
image #12 of Hypericum perforatum ssp. perforatum© Joey Shaw source | Original Image ⭷
image #13 of Hypericum perforatum ssp. perforatum© Erik Danielson source | Original Image ⭷
image #14 of Hypericum perforatum ssp. perforatum© Aidan Campos source | Original Image ⭷
image #15 of Hypericum perforatum ssp. perforatum© Erik Danielson source | Original Image ⭷

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Horticultural Information

NCBG trait

Intro: Erect perennial from a woody base, found in fields, pastures, roadsides and woodland borders. Native of Europe.

Stems: Stems tough, much-branched, with ridges leading from leaf bases, smooth.

Leaves: Leaves opposite, sessile with clasping bases, elliptic to linear-oblong, 3/4-1 1/2 in. long, with mostly translucent glandular dots (magnification may be needed).

Inforescence:

Flowers: Flowers many, in branching, sometimes flat-topped, leafy, terminal clusters; bright yellow; 3/4-1 1/4 in. wide; consisting of 5 petals, which may have black spots along the margins, 5 shorter sepals, and an erect cluster of many bushy stamens and styles in the center.

Fruits: Fruit a brown or black, erect, oval capsule with a rough surface.

Comments:

Height: 1- 2 1/2 ft.

plant sale text:

bloom table text:

description: Erect perennial from a woody base, found in fields, pastures, roadsides and woodland borders. Native of Europe.

stems: Stems tough, much-branched, with ridges leading from leaf bases, smooth.

leaves: Leaves opposite, sessile with clasping bases, elliptic to linear-oblong, 3/4-1 1/2 in. long, with mostly translucent glandular dots (magnification may be needed).

inflorescence:

flowers: Flowers many, in branching, sometimes flat-topped, leafy, terminal clusters; bright yellow; 3/4-1 1/4 in. wide; consisting of 5 petals, which may have black spots along the margins, 5 shorter sepals, and an erect cluster of many bushy stamens and styles in the center.

fruits: Fruit a brown or black, erect, oval capsule with a rough surface.

comments:

cultural notes:

germination code:

native range: Europe



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