Hypericum
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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)
