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Vascular Plants of California
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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 ornament, 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

Etymology: (Augustus Gottlieb Oemler, German naturalist at Savannah, Georgia, 1773--1852)
eFlora Treatment Author: William J. Hess & Thomas J. Rosatti
Unabridged Reference: Landon 1975 Taxon 24:200
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
Jepson eFlora Author: William J. Hess & Thomas J. Rosatti
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)

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Botanical illustration including Oemleria cerasiformis

botanical illustration including Oemleria cerasiformis

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Citation for this treatment: William J. Hess & Thomas J. Rosatti 2012, Oemleria cerasiformis, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on June 19, 2024.

Citation for the whole project: Jepson Flora Project (eds.) 2024, Jepson eFlora,, accessed on June 19, 2024.

Oemleria cerasiformis
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©2007 Steve Matson
Oemleria cerasiformis
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©2009 Barry Breckling
Oemleria cerasiformis
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©2016 Keir Morse
Oemleria cerasiformis
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©2015 Julie Kierstead Nelson
Oemleria cerasiformis
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©2016 Keir Morse

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