Jepson eFlora: Taxon page
Vascular Plants of California
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Hypericum calycinum

Higher Taxonomy
Family: HypericaceaeView Description 
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.
Etymology: (Greek name)
Reference: Robson 2002 Bull Nat Hist Mus London, Bot 32:61--123
Hypericum calycinum L.
Habit: Evergreen shrub, 20--60 cm, from creeping stolons. Stem: erect, 1 or few-branched. Leaf: petiole 0--2 mm; blade 4.5--10 cm, oblong to narrow-ovate, gland-dotted or -streaked. Inflorescence: flowers 1(3) per stem. Flower: sepals 10--20 mm, unequal, elliptic to obovate, tip hooded; petals 25--40 mm, obovate to oblanceolate, yellow; stamens 90--120 per cluster, anthers red; styles 12--20 mm. Fruit: 10--20 mm, ovoid. Seed: 1.5--2 mm, red-brown, surface finely netted.
Ecology: Shaded wildland-urban interface; Elevation: < 1040 m. Bioregional Distribution: NCoRO, c SNH, CCo, SnFrB; Distribution Outside California: native to Turkey. Flowering Time: Jun--Nov Note: Ornamental, occasional escape from cultivation.
Jepson eFlora Author: Robert E. Preston & Jennifer Talbot
Reference: Robson 2002 Bull Nat Hist Mus London, Bot 32:61--123
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)

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Citation for this treatment: Robert E. Preston & Jennifer Talbot 2012, Hypericum calycinum, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on March 02, 2024.

Citation for the whole project: Jepson Flora Project (eds.) 2024, Jepson eFlora,, accessed on March 02, 2024.

Hypericum calycinum
click for enlargement
©2020 Neal Kramer
Hypericum calycinum
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©2020 Neal Kramer
Hypericum calycinum
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©2011 Barry Breckling
Hypericum calycinum
click for enlargement
©2011 Barry Breckling
Hypericum calycinum
click for enlargement
©2020 Neal Kramer

More photos of Hypericum calycinum
in CalPhotos

Geographic subdivisions for Hypericum calycinum:
NCoRO, c SNH, CCo, SnFrB
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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).


Data provided by the participants of the  Consortium of California Herbaria.
View all CCH records
All markers link to CCH specimen records. The original determination is shown in the popup window.
Blue markers indicate specimens that map to one of the expected Jepson geographic subdivisions (see left map). Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.

CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time (fruiting time in some monocot genera).