Fagaceae FAMILY Least Concern

Quercus douglasii

Edibility

3/5

Medicinal

2/5

Safety & Hazards

All parts of the plant contain tannins. Whilst tannins are found in many foods, and have a range of medicinal uses. They are usually only present in low concentrations. In some foods made from oaks (particularly the seeds), the tannin content can be quite high unless the food is treated to reduce tannin content. Tannins are only of low toxicity and, because of their bitter taste and astringency, are unlikely to be eaten in large quantities. However, if they are taken in excess, they can cause stomach pains; constipation followed by bloody diarrhoea: excessive thirst; and excessive urination[ 293 Title Poisonous Plants of North Carolina Publication Author Website http://www.ces.ncsu.edu/depts/hort/consumer/poison/poison.htm Publisher Year 0 ISBN Description An excellent concise but comprehensive guide to toxic plants that grow in N. Carolina. It lists even those plants that are of very low toxicity, including several well-known food plants such as carrots and potatoes. ].

Botanical Description

Quercus douglasii is a deciduous tree with a compact, round canopy; it can grow 6 - 20 metres tall. Usually with a single trunk, sometimes the tree develops a few to several main trunks[ 270 Title Flora of N. America Publication Author Website http://flora.huh.harvard.edu/fna/ Publisher Year 0 ISBN Description An on-line version of the flora with an excellent description of the plant including a brief mention of plant uses. ]. The bole can be 36 - 60cm in diameter. Plants can retain their leaves all year round when growing in moist sites[ 1050 Title Fire Effects Information System Publication Author Website http://www.feis-crs.org/feis/ Publisher Year 0 ISBN Description An on-line information site with comprehensive information on over 1,100 species of plant. Mainly developed to supply information on the effects of fire on plants and animals, it also contains a wealth of other information on the plants ]. The tree was traditionally used as a food, medicine and source of materials, though it is little used at present. It is often planted in restoration projects and is grown as an ornamental. Although Quercus douglasii faces low recruitment rates due to a variety of factors that are not well understood, this species currently occupies a sufficient area and is present in a variety of habitat types. It avoids intense pressure from development and agriculture, due to its growth on poor soils and slopes, and very hot, dry regions. More research is required to understand possible reduction in recruitment and if population size is being significantly reduced. The plant is classified as 'Least Concern' in the IUCN Red List of Threatened Species(2013)[ 338 Title IUCN Red List of Threatened Species Publication Author Website http://www.iucnredlist.org/ Publisher Year 0 ISBN Description A list of plants under threat and facing possible extinction, usually with brief details of the threats and information on habitat. ].

Habitat & Origin

Origintemperate

Native RangeSouth-western N. America - California

HabitatDry soils in valleys, rolling hills and lower mountain slopes; at elevations up to 1,350 metres[ 62 Title A Field Guide to N. American Edible Wild Plants. Publication Author Elias. T. and Dykeman. P. Publisher Van Nostrand Reinhold Year 1982 ISBN 0442222009 Description Very readable. , 82 Title Manual of the Trees of N. America. Publication Author Sargent. C. S. Website http://www.biodiversitylibrary.org/ Publisher Dover Publications Inc. New York. Year 1965 ISBN 0-486-20278-X Description Two volumes, a comprehensive listing of N. American trees though a bit out of date now. Good details on habitats, some details on plant uses. Not really for the casual reader. It can be downloaded from the internet. ], often forming extensive stands[ 229 Title The Complete Trees of N. America. Field Guide and Natural History. Publication Author Elias. T. Publisher Van Nostrand Reinhold Co. Year 1980 ISBN 0442238622 Description A very good concise guide. Gives habitats, good descriptions, maps showing distribution and a few of the uses. It also includes the many shrubs that occasionally reach tree proportions. ].