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Quercus engelmannii
ENGELMANN 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
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.
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 engelmannii Greene
NATIVE
Habit: Tree 5--25 m, evergreen; trunk bark narrowly furrowed, scaly, +- gray; young twigs finely tomentose, in age glabrous. Leaf: 2--6 cm; petiole 3--7 mm; blade oblong to obovate, adaxially dull blue-green, abaxially soft-hairy, glabrous in age, pale blue-green, tip obtuse to rounded, margin generally entire to wavy-dentate. Fruit: cup 10--15 mm wide, 6--8 mm deep, cup- to bowl-shaped, scales +- tubercled; nut 15--25 mm, oblong-cylindric to ovoid, distally obtuse to rounded, shell glabrous inside; mature in year 1.
Ecology: Slopes, foothills, woodland; Elevation: < 1300 m. Bioregional Distribution: SCo, s ChI (1 tree on Santa Catalina Island), SnGb, PR; Distribution Outside California: Baja California. Flowering Time: Apr--May Note: Hybridizes with Quercus berberidifolia, Quercus cornelius-mulleri.
eFlora Treatment Author: Thomas J. Rosatti & John M. Tucker
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Listed on CNPS Rare Plant Inventory

Previous taxon: Quercus durata var. gabrielensis
Next taxon: Quercus garryana

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botanical illustration including Quercus engelmannii

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Citation for this treatment: Thomas J. Rosatti & John M. Tucker 2016. Quercus engelmannii, Revision 2, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=40590, accessed on February 12, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on February 12, 2016.


Quercus engelmannii
click for enlargement
© 2015 Keir Morse
Quercus engelmannii
click for enlargement
© 2015 Keir Morse
Quercus engelmannii
click for enlargement
© 2015 Keir Morse
Quercus engelmannii
click for enlargement
© 2015 Keir Morse
Quercus engelmannii
click for enlargement
© 2015 Keir Morse
Quercus engelmannii
click for enlargement
© 2015 Keir Morse

More photos of Quercus engelmannii in CalPhotos


Geographic subdivisions for Quercus engelmannii:
SCo, s ChI (1 tree on Santa Catalina Island), SnGb, PR;
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.