Coastal Sage Scrub Oak vs Common Oak

Quercus dumosa compared with Quercus robur

Key Differences

• Coastal Sage Scrub Oak is Endangered while Common Oak is Least Concern.

Taxonomic Classification

Rank	Coastal Sage Scrub Oak	Common Oak
Kingdom same	Plantae (植物)	Plantae (植物)
Phylum same	Magnoliophyta (木兰植物门)	Magnoliophyta (木兰植物门)
Class same	Magnoliopsida (木兰纲)	Magnoliopsida (木兰纲)
Order same	Fagales (壳斗目)	Fagales (壳斗目)
Family same	Fagaceae (Beech Family)	Fagaceae (Beech Family)
Genus same	Quercus (Oaks)	Quercus (Oaks)
Species	Quercus dumosa	Quercus robur

Evolutionary Relationship

Coastal Sage Scrub Oak and Common Oak share a common ancestor at the Genus level: Quercus. (Oaks)

Conservation Status

Coastal Sage Scrub Oak

EN — Endangered

Common Oak

LC — Least Concern

Trend: Stable →

Physical Characteristics

Attribute	Coastal Sage Scrub Oak	Common Oak
Diet	—	Autotroph
Average Lifespan	—	1000 years
Average Length	—	25.0 m
Average Weight	—	—

Habitat & Geographic Range

Coastal Sage Scrub Oak

Habitat

Typically found in diverse terrestrial habitats from tropical forests to temperate regions.

Common Oak

Habitat

Typically found in diverse terrestrial habitats from tropical forests to temperate regions.

Range

Widely distributed across Africa (Lesotho, South Africa), Asia (Armenia, India), Europe (8 countries), North America (Canada, United States), Oceania and the Pacific (Australia, New Zealand), and South America (4 countries).

Coastal Sage Scrub Oak

Coastal sage scrub oak (Quercus dumosa) is a small evergreen oak in the family Fagaceae, endemic to the California Floristic Province, occurring in fragmented populations across coastal and foothill areas of southern California and northern Baja California, Mexico. It grows in coastal sage scrub and chaparral communities on thin, rocky, or sandy soils, typically below 900 metres elevation. This shrubby oak rarely exceeds 2 metres and produces small, spiny-margined evergreen leaves and acorns that provide critical food for acorn woodpeckers, scrub jays, mule deer, and other wildlife. Quercus dumosa is assessed as Endangered by the IUCN, with its range having contracted severely due to urbanisation of the Southern California coast, fire suppression altering vegetation dynamics, invasive annual grasses, and prolonged drought associated with climate change. Many populations are now isolated fragments in remaining coastal sage scrub, one of the most threatened plant communities in North America. The species is protected under various Californian conservation plans, and seed banking and restoration planting efforts are ongoing to bolster declining populations.

Common Oak

英国栎（Quercus robur）是欧洲最重要、分布最广的落叶乔木之一，寿命可逾千年，高达40米，所支撑的生物多样性超过欧洲任何其他树种，超过2300种昆虫、真菌、地衣、苔藓和鸟类直接依赖成熟栎树为生。分布于欧洲全境至西亚的温带森林，其坚硬耐久的木材在历史上是造船、建筑和制桶的基础材料。