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


Daniel Potter & Barbara Ertter, family description, key to genera; treatment of genera by Daniel Potter, except as noted

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).
110 genera, ± 3000 species: worldwide, especially temperate; many cultivated for ornamental, fruit, especially Cotoneaster, Fragaria, Malus, Prunus, Pyracantha, Rosa, Rubus. [Potter et al. 2007 Plant Syst Evol 266:5–43] Number of teeth is per leaf or leaflet, not per side of leaf or leaflet, except in Drymocallis. —Scientific Editors: Daniel Potter, Thomas J. Rosatti.
Unabridged references: [Robertson 1974 J Arnold Arbor 55:303–332, 344–401, 611–662]

Key to Rosaceae


William J. Hess & Thomas J. Rosatti

1 sp. (A.G. Oemler, German naturalist at Savannah, Georgia, 1773–1852)
Unabridged etymology: (Augustus Gottlieb Oemler, German naturalist at Savannah, Georgia, 1773–1852)
Unabridged references: [Landon 1975 Taxon 24:200]

O. cerasiformis (Hook. & Arn.) J.W. Landon
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.
x=8. Chaparral, canyons, streambanks, lowland wet to dry open woodland, coast to shaded conifer forest; < 1850 m. Northwestern California, w Cascade Range, w Sierra Nevada, Sacramento Valley (Sutter Buttes), s-c San Joaquin Valley, w Central Western California, sw Western Transverse Ranges; to southern British Columbia. [Nuttallia cerasiformis Hook. & Arn.; Osmaronia cerasiformis (Hook. & Arn.) Greene] Feb–Apr [Online Interchange]

Previous taxon: Oemleria
Next taxon: Peraphyllum


Name search

Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora,, accessed on Nov 26 2015
Citation for this treatment: [Author of taxon treatment] 2013. Oemleria, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on Nov 26 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.

click for enlargement Oemleria cerasiformis
See CalPhotos for additional images
2007 Steve Matson

Geographic subdivisions indicated for the distribution of Oemleria cerasiformis 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.