Jepson eFlora: Taxon page
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Hypericum perforatum subsp. perforatum
KLAMATHWEED

Higher Taxonomy
Family: HypericaceaeView Description 

Common Name: ST. JOHN'S WORT FAMILY
Habit: Annual to shrub [tree]. Leaf: cauline, simple, opposite or whorled, often gland-dotted; stipules 0. Inflorescence: cyme, panicle, or flower 1, terminal or axillary. Flower: bisexual, radial; sepals persistent, generally 5, often fused at base, overlapping; petals generally 5, free; stamens generally many, free or +- fused into 3--5 clusters; pistil 1, ovary superior, chambers 1--3[5], placentas generally axile, style branches 3. Fruit: capsule, generally septicidal. Seed: many, small.
Genera In Family: 37 genera, 1610 species: worldwide, largely tropics. Note: Sometimes included in Clusiaceae.
eFlora Treatment Author: Robert E. Preston & Jennifer Talbot
Scientific Editor: Douglas H. Goldman, Bruce G. Baldwin.
Genus: HypericumView DescriptionDichotomous Key

Habit: Annual to shrub, glabrous. Leaf: sessile Inflorescence: generally terminal cymes, bracted. Flower: sepals [4]5; petals [4]5, deciduous or persistent, generally +- yellow; anthers occasionally black-dotted; ovary chambers 1 or 3(5), placentas 3(5), axile or parietal, projecting into chamber.
Species In Genus: +- 450 species: worldwide. Etymology: (Greek name)

Hypericum perforatum L. subsp. perforatum
NATURALIZED
Habit: Perennial herb 3--12 dm, taprooted. Stem: erect, many from base; sterile axillary branches generally 2--10 cm. Leaf: 1.5--2.5 cm, narrowly oblong; margins rolled under, black-dotted; lower surface conspicuously clear-dotted. Inflorescence: flowers generally 25--100 per stem. Flower: sepals 4--5 mm, lanceolate, acuminate, black- and clear-dotted; petals 8--12 mm, +- oblong, densely black-gland-dotted, bright yellow, twisting, drying in age; stamens in 3 clusters, anthers black-dotted; styles 4--6 mm. Fruit: 7--8 mm, unlobed. Seed: +- 1 mm, brown.
Ecology: Open, disturbed areas in many plant communities; Elevation: 6--1980 m. Bioregional Distribution: NW, CaR, n&c SN, ScV (uncommon s SN, CW, PR, MP); Distribution Outside California: to eastern North America; native to Europe. Toxicity: TOXIC to livestock. Flowering Time: May--Aug Note: 3 other subspecies in Europe, Asia.
Unabridged Note: Antibiotic, antidepressant properties. Compound hypericin inhibits HIV.
eFlora Treatment Author: Robert E. Preston & Jennifer Talbot
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Noxious Weed

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botanical illustration including Hypericum perforatum subsp. perforatum

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Citation for this treatment: Robert E. Preston & Jennifer Talbot 2016. Hypericum perforatum subsp. perforatum, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=91766, accessed on February 06, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on February 06, 2016.


Geographic subdivisions for Hypericum perforatum subsp. perforatum:
NW, CaR, n&c SN, ScV (uncommon s SN, CW, PR, MP);
Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
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map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.