- Look closely at the leaves to identify St . Johnsworts! Plants in the Hypericum genus cause photosensitivity in animals that eat them. For instance, horses, sheep, and goats with white patches (unpigmented areas) on their skin can suffer severe sunburn, swelling, and redness in those areas. The lips, ears and eyelids are especially sensitive . The skin will slough off in severe cases. The toxin is hypericum.
- Look closely at the leaves to identify St. Johnsworts! Plants in the Hypericum genus cause photosensitivity in animals that eat them. For instance, horses, sheep, and goats with white patches (unpigmented areas) on their skin can suffer severe sunburn, swelling, and redness in those areas. The lips, ears and eyelids are especially sensitive. The skin will slough off in severe cases. The toxin is hypericum.
Click on the language to view common names.
Common Names in Afrikaans:
Common Names in English:
Common St Johnswort, Common Goatweed, Common St. John's Wort, Common St. Johnswort, Goatweed, Klamath Weed, Klamathweed, Perforate St John´s-Wort, Perforated St Johns Wort, St John´s-Wort, St. John's Wort, St. Johnswort, Tipton Weed
, or perennial
or with simple
, with translucent
("pale") and often opaque
, black or reddish ("dark") glands
and sometimes abaxial
) and marginal
. Leaves opposite [or whorled
], sessile or short petiolate
pinnate to palmate [or rarely dichotomous], margin
entire or gland-fringed. Inflorescence cymose
. Flowers bisexual
, homostylous [or heterostylous], stellate
or cupped. Sepals 5 and quincuncial or rarely 4 and decussate, unequal or equal, free
or partly united
. Petals (4 or) 5, contorted, golden to lemon yellow [or rarely white], abaxially sometimes tinged or veined red, persistent
or deciduous after anthesis
, usually asymmetric
. Stamens in [4 or]5 fascicles, free and antipetalous
, or some united to form apparently 4 or 3 fascicles with compound
, or irregular and apparently not fasciculate, persistent or deciduous, each single fascicle with up to 70[-120] stamens; filaments
slender, free from nearly base
[or to 2/3 united] or apparently completely free; anthers
or ± basifixed
, dehiscing longitudinally, with gland
fascicles (fasciclodes) absent [very rare]. Ovary 3-5-loculed with axile
placentae or ± completely 1-loculed with (2 or) 3[-5] parietal
placentae, each placenta with [2 or] few to many ovules; styles (2 or) 3-5, free or partly to completely united, ± slender; stigmas small or ± capitate. Fruit a septicidal
capsule or rarely ± indehiscent, valves
often with oil-containing vittae or vesicles
. Seeds small, often carinate
or narrowly unilaterally winged
; testa variously sculptured
, not arillate
[very rarely carunculate]; embryo slender, straight, with distinct
About 460 species: almost cosmopolitan except for arctic and desert areas and most of the lowland tropics; 64 species (33 endemic) in China.
Species Hypericum perforatum
, 20-60(-100) cm tall, erect
; stems numerous
to few, much branched especially distally. Stems
2-lined, with few black glands
. Leaves sessile to subsessile
± narrowly elliptic
to ± narrowly oblong
(0.7-) 1-2.5(-3) cm × 3-7(-15) mm; thickly papery
glands pale, scattered
and sometimes black, few, dots;
glands black, spaced, interspersed with small dense
ones; main lateral
2-paired, tertiary reticulation
or scarcely visible; base subcordate-amplexicaul to rather narrowly
or ± recurved, apex obtuse
Inflorescence 3- to numerous-flowered, from 1-3 nodes; flowering
branches curved-ascending from up to 15 or sometimes more nodes below,
the whole nearly flat-topped to broadly pyramidal
and bracteoles to 4(-7) mm, narrowly lanceolate to linear, margin
entire. Flowers 1.5-2.5(-3) cm in diam., stellate
; buds narrowly
, apex acute. Sepals free
, erect in bud, recurved in fruit,
narrowly oblong or lanceolate to linear, equal, 3-4(-5) × 1-1.2
mm; laminar glands pale and often a few black, in 2(-4) rows
(basally) to dots; intramarginal glands black, few, or absent; margin
entire, apex acute to acuminate with tip
3(-5). Petals golden yellow, oblong to oblong-elliptic, (0.8-) 1.2-1.5
cm × 5-6 mm, 3-4 × as long as sepals, asymmetric
glands black or pale, dots to lines, or often absent; intramarginal
glands black or pale, distal, in sinuses when present; margin distally
. Stamens 40-60, apparently 3-fascicled, longest
6-8 mm, 0.5-0.7 × as long as petals. Ovary narrowly ovoid to
ovoid-ellipsoid; styles 3, 4.5-6 mm, 1.5-2 × as long as ovary,
broadly to rather narrowly spreading
. Capsule ovoid-conic to ovoid,
3-6.5 × 3-5 mm, 1-1.5 × as long as sepals; valves
vittae and lateral yellowish, elongate
or short vesicles
Seeds dark brown, ca. 1 mm; testa finely linear-foveolate. Fl.
fr. Jul-Oct. 2n = 32, 48. [source]
Hypericum perforatum is apparently an allotetraploid that would appear to have arisen from a cross between two diploid taxa, namely H. maculatum subsp. immaculatum (Balkan Peninsula) and H. attenuatum (W Siberia to China). [source]
In both the SW (S Europe, Mediterranean) and SE (China) parts of its range , small-leaved forms of Hypericum perforatum evolved, and both have been named var. microphyllum (respectively by Candolle in 1815 and H. Léveillé in 1908). This more southern Chinese form (var. confertiflorum Debeaux), which intergrades morphologically with the larger-leaved more northern Chinese form, has small, narrow leaves, with dense, smallish partial inflorescences remaining distinct on elongate, widely ascending branches. [source]
Hypericum perforatum has been subdivided into four subspecies , of which two occur in China. [source]
Flowers: Bloom Period: June. • Flower Color: yellow
Size: 12-18" tall.
Care: Shear after flowering to encourage reblooming. Follow a regular watering schedule during the first growing season to establish an extensive root system . Feed regularly during the growing season with a general purpose fertilizer . Prune annually in late winter to promote vigorous new growth.
Open woodlands, meadows, grasslands, and steppes , riverbanks, stony and grassy slopes , roadsides, in dry or well-drained habitats ; 100-2800 m .
Typically found at an altitude of 0 to 1,890 meters (0 to 6,201 feet).
Culture: Space 18-24" apart.
Soil: Prefers organic soil. Needs well-drained soil. Good for dry soils. • Minimum pH: 5.1 • Maximum pH: 7.5
Sunlight: Sun Exposure: Sun to Partial Shade.
Temperature: Cold Hardiness: 4a, 4b, 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b. (map)
- Whittaker & Margulis,1978
- Haeckel, 1866
- Cavalier-Smith, 1981
- Sinnott, 1935 ex Cavalier-Smith, 1998
- Vascular Plants
- Kenrick & Crane, 1997
- Brongniart, 1843
- Takhtajan, 1967
- Thorne Ex Reveal, 1993
- C. Martius, 1835
- Series: on of American wild flowers that bloom in Apr ()
- Order: Malpighiales () - C. Martius, 1835
- Superorder: Theanae () - Thorne Ex Reveal, 1993
- Subclass: Rosidae () - Takhtajan, 1967
- Class: Spermatopsida () - Brongniart, 1843
- Infraphylum: Radiatopses () - Kenrick & Crane, 1997
- Subphylum: Euphyllophytina ()
- Phylum: Tracheophyta () - Sinnott, 1935 ex Cavalier-Smith, 1998 - Vascular Plants
- Subkingdom: Viridaeplantae () - Cavalier-Smith, 1981
- Kingdom: Plantae () - Haeckel, 1866 - Plants
Publishing author : L. Publication : Species Plantarum 1753 (1 May 1753)
Members of the genus Hypericum
ZipcodeZoo has pages for 124 species, subspecies, varieties, forms, and cultivars in this genus. Here are just 100 of them:
H. acutifolium (Sharpleaf St. Johnswort) · H. adpressum (Creeping St. Johnswort) · H. anagalloides (Tinker's Penny) · H. androsaemum (Sweet Amber) · H. androsaemum L. 'Gladys Brabazon' (Sweet Amber) · H. androsaemum 'Albury Purple' (Sweet Amber) · H. androsaemum 'Esm Cho' (Tutsan 'esm Cho') · H. androsaemum 'Esm Española' (Tutsan 'esm Espa) · H. androsaemum 'Esm Greli' (Tutsan 'esm Greli') · H. androsaemum 'Esm Kalua' (Tutsan 'esm Kalua') · H. androsaemum 'Esm Ora' (Tutsan 'esm Ora') · H. androsaemum 'Esm Pin' (Tutsan 'esm Pin') · H. androsaemum 'Esm Re' (Tutsan 'esm Re') · H. androsaemum 'Esm Wet' (Tutsan 'esm Wet') · H. androsaemum 'Glacier' (Sweet Amber) · H. androsaemum 'Glob Dr205' (Tutsan 'glob Dr205') · H. androsaemum 'Glob Lp208' (Tutsan 'glob Lp208') · H. androsaemum 'Golden Tutsan' (Golden Tutsan St. John's Wort) · H. androsaemum 'Verpeacla' (Tutsan 'verpeacla') · H. ascyron (Great St. Johnswort) · H. ascyron gebleri (Great St. Johnswort) · H. boreale (Northern St. Johnswort) · H. brachyphyllum (Coastalplain St. Johnswort) · H. brathys (St. Johnswort) · H. buckleii (Buckley's St. Johnswort) · H. calcycinum (St. John's Wort) · H. calycinum (Aaron's Beard) · H. calycinum 'Brigadoon' (Aaron's Beard) · H. canadense (Lesser Canadian St. Johnswort) · H. canadense boreale (Lesser Canadian St. Johnswort) · H. canariense (Canary Island St. Johnswort) · H. cerastoides (Hypericum) · H. chapmanii (Apalachicola St. Johnswort) · H. cistifolium (Round-Pod St John´s-Wort) · H. concinnum (Goldwire) · H. crux-andreae (Atlantic St. Peter's-Wort) · H. cumulicola (Highlands Scrub Hypericum) · H. densiflorum (Bushy St. Johnswort) · H. denticulatum (Coppery St. Johnswort) · H. diosmoides (Puerto Rico St. Johnswort) · H. dissimulatum (Disguised St. Johnswort) · H. dolabriforme (Straggling St. Johnswort) · H. drummondii (Nits and Lice) · H. edisonianum (Edison Ascyrum) · H. ellipticum (Pale St. Johnswort) · H. elodes (Marsh Hypericum) · H. exile (Florida Sands St. Johnswort) · H. fasciculatum (Peelbark St. Johnswort) · H. forrestii (Forrests St. Johns Wort) · H. fortuneana 'Purple Fountain' (St. Johns Wort) · H. frondosum (Golden St John´s-Wort) · H. frondosum 'Sunburst' (Cedarglade St. John's Wort) · H. galioides (Bedstraw St. Johnswort) · H. gentianoides (Orangegrass) · H. gramineum (Small St John´s-Wort) · H. graveolens (Mountain St. Johnswort) · H. gymnanthum (Claspingleaf St. Johnswort) · H. harperi (Sharplobe St. Johnswort) · H. hookerianum (Hookers St. Johnswort) · H. humifusum (Trailing St John´s-Wort) · H. humifusum suborbiculatum (Trailing St. Johnswort) · H. hypericoides (Reclining St Andrew's Cross) · H. hypericoides hypericoides (St Andrews Cross) · H. hypericoides multicaule (St. Andrew's Cross) · H. hypericoides subsp. multicaule (St. Andrew's Cross) · H. japonicum (Matted St. Johns Wort) · H. kalmianum (Kalm´s St John´s-Wort) · H. kelleri (Hypericum) · H. lancasteri (Lancasters St. Johns Wort) · H. laricifolium (St. Johns Wort) · H. lissophloeus (Smoothbark St. Johnswort) · H. lloydii (Sandhill St. Johnswort) · H. lobocarpum (Fivelobe St. Johnswort) · H. majus (Large St Johnswort) · H. microsepalum (Flatwoods St. Johnswort) · H. mitchellianum (Blue Ridge St. Johnswort) · H. moseranum 'Tri-Color' (Gold Flower) · H. moserianum (St. Johnswort) · H. multicaule (St. Andrew's Cross) · H. mutilum (Dwarf St Johnswort) · H. myrtifolium (Myrtleleaf St. Johnswort) · H. nitidum (Carolina St. Johnswort) · H. nudiflorum (Early St. Johnswort) · H. oblongifolium (St. Johnswort) · H. olympicum f. minus 'Variegatum' (St. Johns Wort) · H. parvulum (Sierra Madre St. Johnswort) · H. patulum Thunb. 'Sungold' (St. Johns Wort) · H. patulum 'Hidcote' (Hidcote Hypericum) · H. patulum 'Variegatum' (St. Johns Wort) · H. pauciflorum (Fewflower St. Johnswort) · H. perforatum (Common St Johnswort) · H. perforatum chinense (Common St Johnswort) · H. polyphyllum (Rockery St. Johns Wort) · H. prolificum (Cinnamon Stick) · H. pseudomaculatum (False Spotted St. Johnswort) · H. pulchrum (Slender St. Johns Wort) · H. punctatum (Spotted St Johnswort) · H. reductum (St Johns Wort) · H. reptans (Creeping St. John's Wort) · H. revolutum keniense (Forest-Primrose)
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Accessed through GBIF Data Portal November 11, 2007:
- Biologiezentrum der Oberoesterreichischen Landesmuseen, Biologiezentrum Linz
- Institute of Nature Conservation PAS, National System of Proetcted Areas
- International Plant Genetic Resources Institute(IPGRI), EURISCO
- Marine Science Institute, UCSB, Paleobiology Database
- Tiroler Landesmuseum Ferdinandeum, Tiroler Landesmuseum Ferdinandeum
- University of Vienna, Institute for Botany - Herbarium WU, Herbarium WU
- inatura - Erlebnis Naturschau Dornbirn, inatura - Erlebnis Naturschau Dornbirn
- Biodiversity Heritage Library NamebankID: 2647508
- Catalogue of Life Accepted Name Code: ITS-21454
- Global Biodiversity Information Facility Taxonkey: 2481042
- Globally Unique Identifier: urn:lsid:ipni.org:names:101692-3
- GRIN Nomen Number: 19600
- Integrated Taxonomic Information System (ITIS) Taxonomic Serial Number (TSN): 21454
- International Plant Names Index (IPNI) ID: 101692-3
- Natural Heritage Network Species Identifier: PDCLU031A0
- U.S.D.A. Plant Symbol: HYPE
- Zipcode Zoo Species Identifier: 11826
- Xi-wen Li & Norman K. B. Robson "Hypericum". in Flora of China Vol. 13 Page 1, 2. Published by Science Press (Beijing) and Missouri Botanical Garden Press. Online at EFloras.org. [back]
- "Hypericum perforatum". in Flora of China Vol. 13 Page 5, 30, 31. Missouri Botanical Garden Press. Online at EFloras.org. [back]
- Mean = 149.780 meters (491.404 feet), Standard Deviation = 220.960 based on 13,242 observations. Altitude information for each observation from British Oceanographic Data Centre. [back]