California Oaks I

Quercus agrifolia(Coast Live Oak) and Quercus dumosa(scrub oak) are probably the most common oaks in California cities.

Acorn matures in one season (at end of new stems)

Acorn matures in two seasons (on older stems)

I. Evergreen

Quercus agrifolia, Q. x alvordiana, Q.dumosa, Q. durata, Q. sadleriana, Q. turbinella

II. Deciduous

Quercus garryana var. breweri, Q. douglasii, Q.engelmannii, Q. garryana, Q. lobata


Quercus chrysolepis, Q. parvula, Q. tomentella, Q. vaccinifolia, Q. wislizenii, Lithocarpus densiflorus (Tanbark Oak)

IV Deciduous

Q. kelloggii, Q. palmeri

How to take care of your oak trees.

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Oak relationship chart

I. California Oaks that bear acorns on each season's growth and are evergreen.

One of the most common trees that you will see driving the roads of California in rural areas are oaks. Many of these trees are hundreds of years old. They are the dominant plants in many habitats. The wildlife of California depend heavily upon oaks. If we break down the state into sections where different types of oaks live, you can see the species of oak that you may commonly encounter in your area.

Quercus x chasei is a natural hybrid of Coast Live Oak (Q. agrifolia) with Black Oak (Q. kelloggii) that occurs from Monterey to Santa Clara counties.

Quercus x ganderi is a natural hybrid that occurs in the San Diego area between the interior form of Coast Live Oak (Q. agrifolia var. oxyadenia) and Black Oak (Q. kelloggii).

There are all sorts of leaf and acorn variation for Coast Live Oak, so do not get excited because one tree has a bigger or smaller leaf.
Quercus dumosa (berberidifolia) has the most messed with name in the state. The botanists have divided up the species into all sorts of forms, most of which exist on the hillsides of both nurseries. McMinn said it in 1939 “ Several varieties of this species have been described, but the characters used in attempting to distinguish them fail when specimens collected throughout the range of this polymorphic species are examined." Amen.

It seems that every few years a budding botanist wanders out of his or her ivory tower and discovers that there are bushy oaks outside. Now these oaks do not key in the floras easily (keying is wandering through a flora's (a book) selection process that is supposed to be based primarily on reproductive parts of the plant). So, Mister or Ms. hot shot botanist writes a paper describing his or her “new oak. Every time a 'new' oak is described it leads to more confusion and more 'new' oaks. These oaks below should probably all be considered various forms of Scrub Oak
(Quercus dumosa).

Quercus berberidifolia- new name for Q. dumosa, given to new plants that are supposed to only occur in San Diego but are elsewhere. The landscape trade only recognizes old Q. dumosa, so in the name of 'restoration' the gene pool is being replanted with oaks from all over the state.

Quercus berberidifolia, the California Scrub Oak used to be part of Quercus dumosa. - grid24_12

Quercus x alvordiana looks like what it probably is, a Blue Oak crossed with a Scrub Oak.(Quercus douglasii X Quercus dumosa)

Some forms of Quercus dumosa (Q. berberidifolia) looks very much like a dwarf Coast Live Oak (Quercus agrifolia) or Interior Live Oak (Quercus wislizenii).

Q. john tuckeri (old name: Quercus turbinella ssp. californica) is like a Q. dumosa but with fuzz on the top of the leaf. But, then sometimes it's like an evergreen Blue Oak (Quercus douglasii).

A Quercus alvordiana woodland in the Temblor range. The trees are about 30 ft tall and wide.. - grid24_12

You can't even say all scrub oaks are scrubby. Some can become small trees with 12 diameter trunks and rarely a size of 30 feet. While others (many times on the same slope) reach a maximum height of six feet.

The floras make it sound easy to figure out the Quercus x alvordiana, Q. dumosa, Q. john tuckeri (or Q. turbinella), and all the other 'new' forms of Quercus dumosa. Isn't so. They morph even into a Blue Oak (Quercus douglasii). Some of the deciduous blue oaks (Quercus douglasii) look exactly like a Tucker's Oak (Quercus john tuckeri), some of the Quercus dumosa look to be hybrids with Quercus agrifolia (Coast Live Oak), some hybrids of Q. dumosa and Q. lobata (Valley Oak) exist, some of the blue oaks do not go deciduous and key to Q. john tuckeri but appear to be blue oaks in all other aspects.

Leather Oak (Quercus durata) is one of the many scrub oaks. The rolled leaf edges on a small tree, almost shrub, is the key. Use as a dwarf oak or as a 'tree' in a miniature forest.

Deer Oak (Quercus sadleriana). This oak grows in lush northern California shady or wet forests.

The only way to succeed is to fail, repeadedly, repeatabley, repeateditly, repetetely, ah, #@#!

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Edited on Oct 25, 2012. Authors:
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