Difference between revisions of "Hypericum"

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webbianum, 22.
 
webbianum, 22.
  
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H. aegyptiacum. Linn. Dwarf shrub: lvs. crowded, elliptic, acute, ¼ - 1/3 in. long: fls. solitary, axillary. 1/3 – ½ in. across, forming leaf) racemes; styles 3. Medit. region. B.M. 6481. G.C. II. 14:503. B.R. 196.—H. arnoldianum, Rchd. (H. galioides X H. lobocarpum). Similar to H. galioides, but with a many-fld. terminal inn. and several-fld. lateral infl.: caps. 3-5-celled. Originated at the Arnold Arboretum.—H. balearicum. Linn. Low upright shrub with the lvs. beneath and the twigs warty: lvs. oval, obtuse, about 1/3 in. long: fla. 1 ½  in. across, solitary, terminal; stylea 5. Medit. region.
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H. aegyptiacum. Linn. Dwarf shrub: lvs. crowded, elliptic, acute, ¼ - 1/3 in. long: fls. solitary, axillary. 1/3 – ½ in. across, forming leaf) racemes; styles 3. Medit. region. B.M. 6481. G.C. II. 14:503. B.R. 196.—H. arnoldianum, Rchd. (H. galioides X H. lobocarpum). Similar to H. galioides, but with a many-fld. terminal inn. and several-fld. lateral infl.: caps. 3-5-celled. Originated at the Arnold Arboretum.—H. balearicum. Linn. Low upright shrub with the lvs. beneath and the twigs warty: lvs. oval, obtuse, about 1/3 in. long: fla. 1 ½  in. across, solitary, terminal; stylea 5. Medit. region.
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B.M. 137.—H. canariense, Linn. Allied to H. floribundum. Shrub, to 15 ft.: lvs. oblong-lanceolate, narrowed at the base, 2-3 in.: flu. 1-1 ½ in. across, in panicles; sepals ovate, acute, ciliate. L.B.C. 10:953.—H. coris, Linn. Procumbent subshrub, 6-8 in. high: lvs narrowly linear, revolute on the margin, about 1 in. long, in whorls of 4-6: fls. ¾ in. across, in few-fld. loose cynics; styles 3. Cent, and S. Eu. B.M. 6503.—H. cuneatum, Poir. Low diffuse subshrub. ½ -l ft. high: lvs. obovate, ¼ -1/3 in. long: fls. ¾ in. across, axillary, slender-stalked, forming leafy racemes. Asia Minor. —H. dawsonianum, Rehd. (H. lobocarpum X H. prolificum). Differs from H. prolificum in the more numerous fls. and the 3-5-celled, furrowed caps. Originated at the Arnold Arboretum.—H. dolabriforme, Vent. Procumbent perennial, with ascending sts. 6-20 in. high: lvs. linear-lanceolate, ½ - 1 ½  in. long: fls. 1 in. across, in terminal leafy corymbs. Ky. and Tenn. B.B. (ed. 2) 2:532.— H. elegans, Steph. Upright perennial, ½ -l ft high.: lvs. ovate- lanceolate, ¾ - 1 in. long: fls. ¾ -1 in. across, in terminal panicles; sepals ovate-lanceolate, glandular-ciliate. Cent. Eu. to Altai Mts. R.F.G. 6:360 (5190).—H. elodes, Huds.=H. helodes, Linn.— H. empetrifolium, Willd. Upright shrub, to 1 ft.: lvs. linear, revolute on the margin, ½ - ¾  in. long, in whorls of 3: fls. ½ - ¾ in. across, in 3-5-fld. cymes forming panicles; sepals broadly oblong. 8. E. Eu., Asia Minor. B.M. 6764. Gn. 30, p. 221.—H fasciculatum. Lam. Allied to G. galioides. Shrub, to 6 ft.: lvs. linear, thick, ½ - ¾  in. long: fls. 1/3 – ½ in. across, in narrow panicles. N. C. to Fla. and Texas.—H. fragile, Heldr. A Sart. Dwarf subshrub: lvs. ovate, imbricate, Kin. long, glaucescent-fls. large, in 3- to many-fld. cymes; sepals linear-lanceolate. Greece.—H. helodes, Linn. Procumbent perennial, with orbicular-ovate, villous lvs. 1/3 – ¾ in. long: fls. pale
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goat-like odor. Arching shrub, with strongly 2-edged branchlets: lvs. ovate to ovate-oblong. 1 ½ -2 in. long: fls. 1 in. across, in few- fid, dense corymbs. Caucasus.—H. japonicum, Thunb. Decumbent perennial, with ovate or oval 3-nerved lvs. and 4-angled sts.: fls. ¼ in. across, with petals equaling the lanceolate sepals, in terminal cymes. E. Asia to Austral. Scarcely ornamental.—H. lysimachioides. Wall. Slender shrub, with slightly angular arching branchleta: lvs. ovate to ovate-oblong, acute. 1-1 ½ in. long: fls. 1 in. across in loose leafy cymes; sepals linear-lanceolate; styles 5. Himalayas. V.F. 25,—H. montanum, Linn. Perennial: lower lvs. larger, ovate, glabrous: fls. in close compact cymes, often reduced to a head. Cent, and S. Eu.—H. napaulense, Choisy (H. nepalensis, Hort.). Trailing subshrub with ovate to ovate-lanceolate lvs. ½ - ¾ in. long: fls. 1/3 in. across in few-fld. loose cymes. Himalayas.—For H. nepalense, Hort.. see also No. 6.—H. nothum, Rehd. (H. densiflorum X H. kalmianum). Similar to H. densiflorum, but fls. less numerous, lvs. narrower and caps. 3-5-celled, slightly furrowed. Originated at the Arnold Arboretum.—H. nummularium, Linn. Diffuse ascending subshrub: lvs. roundish, 1/3 – ½ in. long: fls. ¾ in. across, in terminal cymes; sepals glandularciliate. Pyrenees. R.F.G. 6:346 (5184).—H. olympicum. Linn. Upright or ascending subshrub, 1 ft.: lvs. oblong-lanceolate, grayish green, ½ - 1 ½ long: fls. golden yellow. 1 ½ - 2 ½ in. across, in terminal few-fld. corymbs; sepals large, pointed; petals oblong-obovate. S. E. Eu., Asia Minor. B.M. 1R67. Gn. 31:302.—H. opacum, Ton. & Gray. Allied to H. sphaerocarpum. Subshrub, 1-3 ft.: lvs. oblong-lanceolate, ½ -l in. long: fls. 1/3 in. across, in open corymbs; sepals obtuse: caps, ovoid. S. C. to Fla. and Miss. G.F. 5:305.— H. orientale, Linn. Upright perennial, ½ -l ft.: lvs. obovate-oblong to linear-oblong, obtuse, glandular-ciliate, ½ -l in. long: fls. 1 in. across, in small terminal cymes. Asia Minor.—H. polyphyllum, Boiss. Perennial with ascending sts.: lvs. elliptic-linear, glaucous, 1/3 – 1/3 in. long: fls. 1 ½ -2 in. across, in dense terminal cymes. Cilicia.—H. pulchrum, Linn. Allied to H. perforatum. Sts. terete: lvs. ovate, clasping, 1/3 – ½ in. long: fls. ½ - ¾ in. across, in terminal panicles; sepals glandular-ciliate. Cent. Eu. R.F.G. 6:347 (5185).— H. ramosissimum, Ledeb.=H. inodorum.—H. repens, Linn. Perennial, with prostrate sts.: lvs. oblong or linear-oblong, ¼ - 1/3 in. long: fls. golden yellow, 1 in. across in few-fld. terminal cymes. S. E. Eu.. Asia Minor. S.F.G. 8:775.—H. reptans, Hook. f. 4 Thorns. Prostrate shrub, with rooting sts.: Ivs. elliptic-oblong, ¼ - ½ in. long: fls. cup-shaped, solitary, terminal, 1 ¾ in. across; petals broadly obovate; styles 5. Himalayas. Gn. 24, p. 267; 30. p. 221. —H. salicifolium, Sieb. & Zucc. Allied to H. chinense, but distinguished by the narrower acute lvs., many-fld. corymbs and acute sepals. Japan.—H. splendens. Small. Allied to H. aureum. Shrub, to 5 ft.: lvs. oblong, ¾ -1 in. long: fls. pedicelled, 1 ½  in. across, in several- to many-fld. cymes; stamens orange-colored: caps, with 3 narrow wings. Ga. Seems not yet in cult.; very desirable.—H. tomentosum, Linn. Perennial with ascending sts.: lvs. ovate, woolly, 1/3 -  ¾ in. long: fls. ½ - ¾ in. across, in many-fld. corymbs; sepals ciliate. acute. Eu. R.F.G. (1:340 (5183).—H. turgidum, Small. Allied to H. sphaerocarpum. Shrub. 1-2 ft.: lvs. linear-oblanceolate, ½ - 1 in. long: fls. 1 in. across in several-fid, cymes; sepals ovate to elliptic: caps, subglobose, broadest at the top. Ala.
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Alfred Rehder.
  
 
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Revision as of 13:15, 5 March 2010


Hypericum calycinum cv. 'Hidcote'


Plant Characteristics
Cultivation
Scientific Names

Clusiaceae >

Hypericum >



Read about Hypericum in the Standard Cyclopedia of Horticulture 

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The above text is from the Standard Cyclopedia of Horticulture. It may be out of date, but still contains valuable and interesting information which can be incorporated into the remainder of the article. Click on "Collapse" in the header to hide this text.



Hypericum 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

Selected species:

Hypericum balearicum
Hypericum coris
Hypericum ericoides, fruiting
Hypericum inodorum cv. 'Magical Passion'
Hypericum lanceolatum
Hypericum olympicum
Slender St. John's-wort, Hypericum pulchrum
Hypericum tomentosum
Hypericum uralum


Gallery

If you have a photo of this plant, please upload it! Plus, there may be other photos available for you to add.

  • photo 1

  • photo 2

  • photo 3

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


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