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Oemleria cerasiformis

Higher Taxonomy
Family: RosaceaeView DescriptionDichotomous Key

Common Name: ROSE FAMILY
Habit: Annual to tree, glandular or not. Leaf: simple to palmately or pinnately compound, generally alternate; stipules free to fused (0), persistent to deciduous. Inflorescence: cyme, raceme, panicle, cluster, or flowers 1; bractlets on pedicel ("pedicel bractlets") generally 0--3(many), subtended by bract or generally not. Flower: generally bisexual, radial; hypanthium free or fused to ovary, saucer- to funnel-shaped, subtending bractlets ("hypanthium bractlets") 0--5, alternate sepals; sepals generally 5; petals generally 5, free; stamens (0,1)5--many, anther pollen sacs generally 2; pistils (0)1--many, simple or compound, ovary superior to inferior, styles 1--5. Fruit: 1--many per flower, achene (fleshy-coated or not), follicle, drupe, or pome with generally papery core, occasionally drupe-like with 1--5 stones. Seed: generally 1--5 (per fruit, not per flower).
Genera In Family: 110 genera, +- 3000 species: worldwide, especially temperate; many cultivated for ornamental, fruit, especially Cotoneaster, Fragaria, Malus, Prunus, Pyracantha, Rosa, Rubus. Note: Number of teeth is per leaf or leaflet, not per side of leaf or leaflet, except in Drymocallis.
eFlora Treatment Author: Daniel Potter & Barbara Ertter, family description, key to genera; treatment of genera by Daniel Potter, except as noted
Scientific Editor: Daniel Potter, Thomas J. Rosatti.
Genus: OemleriaView Description 

Common Name: OSO BERRY

Species In Genus: 1 sp. Etymology: (Augustus Gottlieb Oemler, German naturalist at Savannah, Georgia, 1773--1852)
eFlora Treatment Author: William J. Hess & Thomas J. Rosatti

Oemleria cerasiformis (Hook. & Arn.) J.W. Landon
Habit: Shrub, small tree, 1--6 m; dioecious (monoecious). Leaf: simple, deciduous, 5--13 cm, 2--5 cm wide, elliptic to narrow-obovate, abaxially paler, sometimes puberulent becoming glabrous, adaxially glabrous; margins generally entire, +- rolled under; stipules early-deciduous; petiole 5--15 mm. Inflorescence: racemes on short lateral branches, 3--10 cm, pendent, bracted; pedicel bractlets 1--2, near top. Flower: fragrant, unisexual, occasionally bisexual; hypanthium 3--4.5 mm, bractlets 0; petals 3--6 mm, clawed, white. Staminate Flower: hypanthium persistent; petals > pistillate petals; stamens 15, in 3 series, prominent. Pistillate Flower: most of hypanthium deciduous after flower; ovaries generally 5, prominent, free, styles deciduous. Fruit: drupes 1--5, 5--15 mm, bean-shaped, blue-black, glaucous. Chromosomes: x=8.
Ecology: Chaparral, canyons, streambanks, lowland wet to dry open woodland, coast to shaded conifer forest; Elevation: < 1850 m. Bioregional Distribution: NW, w CaR, w SN, ScV (Sutter Buttes), s-c SnJV, w CW, sw WTR; Distribution Outside California: to southern British Columbia. Flowering Time: Feb--Apr
Synonyms: Nuttallia cerasiformis Hook. & Arn.; Osmaronia cerasiformis (Hook. & Arn.) Greene
eFlora Treatment Author: William J. Hess & Thomas J. Rosatti
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botanical illustration including Oemleria cerasiformis


Citation for this treatment: William J. Hess & Thomas J. Rosatti 2016. Oemleria cerasiformis, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on May 01, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora,, accessed on May 01, 2016.

Oemleria cerasiformis
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© 2015 Julie Kierstead Nelson
Oemleria cerasiformis
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© 2007 Steve Matson
Oemleria cerasiformis
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© 2007 Aaron Schusteff
Oemleria cerasiformis
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© 2015 Julie Kierstead Nelson
Oemleria cerasiformis
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© 2009 Barry Breckling
Oemleria cerasiformis
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© 2004 Julie Kierstead Nelson

More photos of Oemleria cerasiformis in CalPhotos

Geographic subdivisions for Oemleria cerasiformis:
NW, w CaR, w SN, ScV (Sutter Buttes), s-c SnJV, w CW, sw WTR;
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).

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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.