Hypericum

Plant Characteristics

Cultivation

Scientific Names

Clusiaceae >

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Hypericum (pronounced /ˌhaɪˈpɪərɨkəm/)[1] is a genus of about 400 species of flowering plants in the family Clusiaceae, subfamily Hypericoideae (formerly often considered a full family Hypericaceae).

The genus has a nearly worldwide distribution, missing only from tropical lowlands, deserts and polar regions. All members of the genus may be referred to as St. John's-wort, though they are also commonly just called hypericum, and some are known as tutsan. The marsh St. John's-worts are nowadays separated in Triadenum.

St. John's-worts vary from annual or perennial herbaceous herbs 5–10 cm tall to shrubs and small trees up to 12 m tall. The leaves are opposite, simple oval, 1–8 cm long, either deciduous or evergreen. The flowers vary from pale to dark yellow, and from 0.5–6 cm in diameter, with five (rarely four) petals. The fruit is usually a dry capsule which splits to release the numerous small seeds; in some species it is fleshy and berry-like.

Cultivation

Hypericum are suitable for dry, poor soils. They thrive in sunny positions, although some species such as Hypericum calycinum will also tolerate shade.

Propagation

Hypericum can be propagated by seed or cuttings

• Seed - Surface sow between January and May and put in a cold frame. Pre-soaking in distilled water reportedly increases germination rates.

• Cuttings - Take softwood cuttings from tips of current growth in August and use a sandy compost. Place the cuttings in a cold frame.

Pests and diseases

Hypericum is remarkably resilient to pests and diseases. Very occasionally plants may be infected by rust.

Species

Hypericum acmosepalum

Hypericum acostanum

Hypericum addingtonii

Hypericum adenotrichum

Hypericum aegypticum

Hypericum anagalloides

Hypericum androsaemum

Hypericum annulatum

Hypericum aphyllum

Hypericum ascyron

Hypericum asplundii

Hypericum athoum

Hypericum atomarium

Hypericum augustinii

Hypericum balearicum

Hypericum balfourii

Hypericum barbatum

Hypericum beanii

Hypericum bellum

Hypericum boreale

Hypericum buckleii

Hypericum bupleuroides

Hypericum calycinum

Hypericum canadense

Hypericum canariense

Hypericum capitatum

Hypericum cerastoides

Hypericum choisianum

Hypericum cistifolium

Hypericum concinnum

Hypericum confertum

Hypericum cordifolium

Hypericum coris

Hypericum crenulatum

Hypericum crux-andreae

Hypericum cumulicola

Hypericum curvisepalum

Hypericum delphicum

Hypericum densiflorum

Hypericum denticulatum

Hypericum dissimulatum

Hypericum dyeri

Hypericum eastwoodianum

Hypericum elegans

Hypericum ellipticum

Hypericum elodes

Hypericum elongatum

Hypericum empetrifolium

Hypericum erectum

Hypericum ericoides

Hypericum fasciculatum

Hypericum fieriense

Hypericum foliosum

Hypericum formosum

Hypericum forrestii

Hypericum fragile

Hypericum frondosa

Hypericum galioides

Hypericum gentianoides

Hypericum glandulosum

Hypericum gnidiifolium

Hypericum gramineum

Hypericum grandifolium

Hypericum graveolens

Hypericum hartwegii

Hypericum henryi

Hypericum hircinum

Hypericum hirsutum

Hypericum hookerianum

Hypericum humifusum

Hypericum hypericoides

Hypericum hyssopifolium

Hypericum × inodorum

Hypericum japonicum

Hypericum kalmianum

Hypericum kamtschaticum

Hypericum kelleri

Hypericum kotschyanum

Hypericum kouytchense

Hypericum lagarocladum

Hypericum lancasteri

Hypericum lanceolatum

Hypericum lanuginosum

Hypericum leschenaultii

Hypericum linariifolium

Hypericum linarioides

Hypericum llanganaticum

Hypericum lobbii

Hypericum lobocarpum

Hypericum maclarenii

Hypericum maculatum

Hypericum maguirei

Hypericum majus

Hypericum matangense

Hypericum monogynum

Hypericum montanum

Hypericum montbretii

Hypericum × moserianum

Hypericum mutilum

Hypericum myricariifolium

Hypericum nanum

Hypericum nudiflorum

Hypericum nummularium

Hypericum oblongifolium

Hypericum olympicum

Hypericum orientale

Hypericum origanifolium

Hypericum pallens

Hypericum patulum

Hypericum peninsulare

Hypericum perfoliatum

Hypericum perforatum

Hypericum prietoi

Hypericum prolificum

Hypericum pseudohenryi

Hypericum pulchrum

Hypericum punctatum

Hypericum quitense

Hypericum reflexum

Hypericum reptans

Hypericum reductum

Hypericum revolutum

Hypericum richeri

Hypericum roeperanum

Hypericum rumeliacum

Hypericum sampsonii

Hypericum scopulorum

Hypericum scouleri

Hypericum setosum

Hypericum socotranum

Hypericum sphaerocarpum

Hypericum spruneri

Hypericum stellatum

Hypericum subsessile

Hypericum tenuicaule

Hypericum tetrapterum

Hypericum tomentosum

Hypericum tortuosum

Hypericum trichocaulon

Hypericum triquetrifolium

Hypericum undulatum

Hypericum uralum

Hypericum vacciniifolium

Hypericum wilsonii

Hypericum xylosteifolium

Hypericum yakusimense

Gallery

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References

• Standard Cyclopedia of Horticulture, by L. H. Bailey, MacMillan Co., 1963
• Flora: The Gardener's Bible, by Sean Hogan. Global Book Publishing, 2003. ISBN 0881925381 -->
• American Horticultural Society: A-Z Encyclopedia of Garden Plants, by Christopher Brickell, Judith D. Zuk. 1996. ISBN 0789419432 -->
• Sunset National Garden Book. Sunset Books, Inc., 1997. ISBN 0376038608 -->

External links

• w:Hypericum. Some of the material on this page may be from Wikipedia, under the Creative Commons license.
• Hypericum QR Code (Size 50, 100, 200, 500)