Jepson eFlora: Taxon page
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Quercus agrifolia

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

Habit: Tree 5--15 m, deciduous; trunk bark scaly, +- gray; twigs tomentose. Leaf: 4--7 cm; petiole 3--10 mm; blade oblong to obovate, adaxially glabrous to sparsely hairy, green, +- shiny, abaxially densely appressed-stellate-hairy, +- pale green, tip obtuse to rounded, margin lobes 2--6(8) per leaf, shallow, generally pointed. Fruit: cup 10--20 mm wide, 6--10 mm deep, hemispheric, scales tubercled, canescent; nut 20--35 mm, conic-oblong to ovoid, distally acute to +- obtuse, shell glabrous inside; mature in year 1.
Note: Considered a species by Greene but derived from hybrids involving Quercus pacifica, Quercus lobata, perhaps others; needs study.

Quercus agrifolia Née
Habit: Tree (6)10--25 m, evergreen; top wide; trunk bark furrowed, +- checkered, +- gray. Leaf: 2.5--6(9) cm; petiole 4--15 mm; blade generally widely elliptic to round, generally adaxially convex, +- dull green, abaxially glabrous to densely tomentose, dull, pale green, tip rounded to spine-toothed, margin rolled under or not, weakly spine-toothed. Fruit: cup 10--16 mm wide, 8--15 mm deep, obconic, scales thin, +- not tubercled, +- glabrous, +- brown; nut 25--35 mm, slender, ovoid, distally acute, shell woolly inside; mature in year 1.

eFlora Treatment Author: John M. Tucker
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Next taxon: Quercus agrifolia var. agrifolia

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Citation for this treatment: John M. Tucker Quercus agrifolia, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on November 17, 2017.

Citation for the whole project: Jepson Flora Project (eds.) 2017, Jepson eFlora,, accessed on November 17, 2017.

Quercus agrifolia
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© 2014 California Academy of Sciences
Quercus agrifolia var. oxyadenia
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© 2014 Keir Morse
Quercus agrifolia var. oxyadenia
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© 2015 Keir Morse
Quercus agrifolia var. oxyadenia
click for enlargement
© 2014 Keir Morse
Quercus agrifolia var. oxyadenia
click for enlargement
© 2014 Keir Morse
Quercus agrifolia var. agrifolia
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© 2008 Keir Morse

More photos of Quercus agrifolia in CalPhotos

Geographic subdivisions for Quercus agrifolia:
Markers link to CCH specimen records. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues. Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
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.