Directory       News       Site Map       Home
    Jepson eFlora: Taxon page
Key to families | Table of families and genera

Previous taxon Indexes to all accepted names and synonyms:
| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
Previous taxon


Robert E. Preston & Jennifer Talbot

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.
37 genera, 1610 species: worldwide, largely tropics. [Gustaffson et al. 2002 Int J Plant Sci 163:1045–1054] Sometimes included in Clusiaceae. —Scientific Editors: Douglas H. Goldman, Bruce G. Baldwin.

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.
± 450 species: worldwide. (Greek name) [Robson 2002 Bull Nat Hist Mus London, Bot 32:61–123]

Key to Hypericum

H. perforatum L. subsp. perforatum KLAMATHWEED
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.
Open, disturbed areas in many plant communities; 6–1980 m. Northwestern California, Cascade Range, n&c Sierra Nevada, Sacramento Valley (uncommon s Sierra Nevada, Central Western California, Peninsular Ranges, Modoc Plateau); to eastern North America; native to Europe. TOXIC to livestock. 3 other subspecies in Europe, Asia. May–Aug {Noxious weed} [Online Interchange]
Unabridged note: Antibiotic, antidepressant properties. Compound hypericin inhibits HIV.

Previous taxon: Hypericum mutilum subsp. mutilum
Next taxon: Hypericum scouleri


Name search

Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora,, accessed on Dec 1 2015
Citation for this treatment: [Author of taxon treatment] 2013. Hypericum, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on Dec 1 2015

Copyright © 2014 Regents of the University of California
We encourage links to these pages, but the content may not be downloaded for reposting, repackaging, redistributing, or sale in any form, without written permission from The Jepson Herbarium.

Geographic subdivisions indicated for the distribution of Hypericum perforatum subsp. perforatum 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.
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).

View elevation by latitude chart
Data provided by the participants of the Consortium of California Herbaria.
View all CCH records


CCH collections by month

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