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Vascular Plants of California
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Quercus garryana var. breweri

Higher Taxonomy
Family: FagaceaeView DescriptionDichotomous Key
Common Name: OAK FAMILY
Habit: Shrub, tree, evergreen or not; monoecious. Leaf: simple, alternate, petioled; margin entire to lobed; stipules small, generally deciduous. Staminate Inflorescence: catkin or stiff spike, many-flowered. Pistillate Inflorescence: 1--few-flowered, generally above staminate inflorescence; involucre bracts many, generally overlapping, flat or cylindric. Staminate Flower: calyx generally 4--6-lobed, minute; petals 0; stamens 4--12+. Pistillate Flower: calyx generally 6-lobed, minute; petals 0; ovary inferior, style branches generally 3. Fruit: 1 nut subtended, partly enclosed by scaly, cup-like involucre or 1--3 nuts subtended, enclosed by spiny, bur-like involucre; mature years 1--2. Seed: generally 1.
Genera In Family: 7 genera, +- 900 species: generally northern hemisphere. Note: Wood of Quercus critical for pre-20th century ship-building, charcoal for metallurgy; some now supply wood (Fagus, Quercus), cork (Quercus suber), food (Castanea, chestnut). Lithocarpus densiflorus moved to Notholithocarpus.
eFlora Treatment Author: John M. Tucker, except as noted
Scientific Editor: Thomas J. Rosatti, Bruce G. Baldwin.
Genus: QuercusView DescriptionDichotomous Key

Common Name: OAK
Habit: Evergreen or not. Leaf: stipules small, generally early-deciduous. Staminate Inflorescence: catkins, 1--several, pendent, slender, proximal on twig. Pistillate Inflorescence: in distal leaf axils, short-stalked; flower generally 1. Staminate Flower: stamens 4--10. Pistillate Flower: calyx minute, generally 6-lobed; ovary enclosed by involucre. Fruit: nut 1, partly enclosed by cup-like involucre (cup) with appressed scales (nut and cup = acorn), remnants of perianth and style persistent as small point at tip; scales tubercled to not; mature in years 1 (on younger stems) or 2 (on older stems). Chromosomes: 2n=24.
Etymology: (Latin: ancient name for oak) Note: Many named hybrids; those (3) treated here form widespread populations; most others occur as single individuals, and some but not all of these are mentioned here, under the first parent treated (alphabetically). Reproduction of many species declining due to habitat degradation or loss as well as disease. Quercus robur added, as waif.
eFlora Treatment Author: Thomas J. Rosatti & John M. Tucker
Reference: Manos et al. 1999 Molec Phylogen Evol 12:333--349
Unabridged Reference: Cottam, W. P., J. M. Tucker, & F. S. Santamour. 1982. Oak hybridization at the University of Utah. State Arboretum of Utah Publication No. 1. Salt Lake City; Hardin, J. W. 1975. Hybridization and introgression in Quercus alba. Journal of the Arnold Arboretum 56: 336--363; Manos, P. S., Doyle, J. J., & Nixon, K. C. 1999. Phylogeny, biogeography, and processes of molecular differentiation of Quercus subgenus Quercus (Fagaceae). Molec Phylogen Evol 12: 333--349.
Species: Quercus garryanaView Description 

Common Name: OREGON OAK
Habit: Shrub to small tree 0.3--5 m or tree 8--20 m, deciduous; trunk bark thin, scaly, +- light gray; twigs short-hairy, +- green, glabrous in age, red-brown. Leaf: 5--15 cm; petiole 5--25 mm; blade elliptic to obovate, adaxially shiny, dark green, abaxially short-hairy, dull, light green, tip obtuse to rounded, margin lobes 5--7 per leaf, deep, entire or 2-toothed. Fruit: cup 12--25 mm wide, 4--9 mm deep, cup- to bowl-shaped, proximal scales +- tubercled, distal +- not; nut 20--30 mm, ovoid to +- spheric, distally rounded, shell glabrous inside; mature in year 1.

Quercus garryana Hook. var. breweri (Engelm.) Jeps.
Habit: Shrub to small tree, spreading, with multiple trunks. Stem: terminal buds 3--5 mm, ovoid, hairs sparse, brown or +- red. Leaf: blade 5--9 cm, abaxially with erect hairs, rays of stellate hairs generally 4--6, 0.25--0.5 mm.
Ecology: Mtn slopes, conifer forest, maritime chaparral; Elevation: (150)1400--2000 m. Bioregional Distribution: KR, NCoRH, CCo (nw San Luis Obispo Co.); Distribution Outside California: to Oregon. Flowering Time: Apr--Jun Note: Hybridizes with Quercus sadleriana.
Synonyms: Quercus breweri Engelm.
Jepson eFlora Author: Thomas J. Rosatti & John M. Tucker
Reference: Manos et al. 1999 Molec Phylogen Evol 12:333--349
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)

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Botanical illustration including Quercus garryana var. breweribotanical illustration including Quercus garryana var. breweri

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Citation for this treatment: Thomas J. Rosatti & John M. Tucker 2014, Quercus garryana var. breweri, in Jepson Flora Project (eds.) Jepson eFlora, Revision 2,, accessed on July 20, 2024.

Citation for the whole project: Jepson Flora Project (eds.) 2024, Jepson eFlora,, accessed on July 20, 2024.

Quercus garryana  
var. breweri
click for image enlargement
©2008 Keir Morse
Quercus garryana  
var. breweri
click for image enlargement
©2016 Keir Morse
Quercus garryana  
var. breweri
click for image enlargement
©2014 Julie Kierstead Nelson
Quercus garryana  
var. breweri
click for image enlargement
©2010 George W. Hartwell
Quercus garryana  
var. breweri
click for image enlargement
©2015 Julie Kierstead Nelson

More photos of Quercus garryana var. breweri
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Geographic subdivisions for Quercus garryana var. breweri:
KR, NCoRH, CCo (nw San Luis Obispo Co.)
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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 occurrence).


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 Flowering-Fruiting Monthly Counts

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).