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HYPERICACEAE ST. JOHN'S WORT FAMILY

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.

HYPERICUM
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
NATURALIZED
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.

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Oct 22 2014
Citation for this treatment: [Author of taxon treatment] 2013. Hypericum, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=91766, accessed on Oct 22 2014

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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.
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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.