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Quercus cedrosensis
CEDROS ISLAND OAK

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
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.
Species In Genus: +- 600 species: northern hemisphere, to northern South America, India. 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

Quercus cedrosensis C.H. Mull.
NATIVE
Habit: Tree to 5 m, decumbent shrub 2--3 m, or prostrate shrub to 2 dm, evergreen; trunk bark flaky, gray; twigs brown, hairy, dark gray in age; buds 1 mm, widely ovoid or subround, light brown, sparsely hairy. Leaf: 0.6--2(3.5) cm; petiole 1.5--2.5 mm; blade lanceolate, ovate, oblong, elliptic, or subround, adaxially flat or convex, glossy green, glabrous, abaxially glaucous, glabrous, veins white, base rounded or cordate, tip acute to widely rounded, generally spine-like, margin entire or with few irregular spine-tipped teeth. Fruit: stalk +- 0--10 mm; cup 7--12 mm wide, 5--6 mm deep, cup-shaped, scales thickened basally; nut 15--22 mm, narrowly ovoid to fusiform, distally acute to +- obtuse, shell tomentose inside; mature in year 2.
Ecology: Chaparral; Elevation: 100--1800 m. Bioregional Distribution: sw PR (Otay Mtn, San Diego Co.); Distribution Outside California: Baja California. Flowering Time: Apr--May
eFlora Treatment Author: Thomas J. Rosatti & John M. Tucker
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Listed on CNPS Rare Plant Inventory

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botanical illustration including Quercus cedrosensis

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Citation for this treatment: Thomas J. Rosatti & John M. Tucker 2016. Quercus cedrosensis, Revision 2, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=80204, accessed on May 03, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on May 03, 2016.


Geographic subdivisions for Quercus cedrosensis:
sw PR (Otay Mtn, San Diego Co.);
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.
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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).

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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.