Tanoak
ExplorePlants
Tanoak
notholithocarpus densiflorus
The Tanoak is a majestic evergreen tree native to the coastal regions of California and southwestern Oregon. Despite its common name, it is not a true oak, but rather an evolutionary link between oaks and chestnuts, classified in its own unique genus Notholithocarpus. Historically prized for its tannin-rich bark which was once heavily harvested for leather tanning, this tree plays a foundational role in its native forest ecosystems by providing abundant food and shelter for a variety of wildlife. Tanoaks are incredibly resilient, capable of vigorous resprouting from their root crowns after wildfires, making them a cornerstone species of the Pacific Northwest and Californian chaparral.
Habitat: Found in moist coastal forests, mixed evergreen woodlands, and redwood ecosystems of California and Oregon.
Appearance
Tanoaks typically grow as medium to large trees reaching heights of 15 to 45 meters, though they can also form dense, multi-stemmed shrubs in drier habitats. They are easily recognized by their thick, leathery, evergreen leaves that feature prominent parallel veins and sharply toothed margins. The leaves have a distinctive pale, fuzzy underside covered in fine, woolly golden-white hairs. Perhaps their most identifying feature is the acorn-like fruit, which sits inside a unique cup densely covered in long, spreading, bur-like scales, giving them a whiskery or spiny appearance reminiscent of a chestnut bur.
KingdomPlantaePhylumTracheophytaClassMagnoliopsidaOrderFagalesFamilyFagaceaeGenusNotholithocarpus
Category
PlantsRarity
Common
Danger
1/5 · Very low
Snaps
Be the first to snap!
Interesting facts
Despite its common name, the tanoak is not a true oak, but rather an evolutionary bridge between chestnuts and oaks.
Its acorns are cradled in unique, brush-like cups covered in long, hairy fibers that look like tiny sea urchins.
The common name tanoak refers to the historical use of its bark by early settlers for tanning leather due to its extremely high tannin content.
Special abilities
Ability
Fire-Resilient Resprouting
Capable of rapidly growing back from underground root crowns after intense wildfires.
Ability
Fungal Symbiosis
Establishes deep mycorrhizal networks with underground fungi to maximize nutrient and water uptake.
Ability
Tannin Defense
Accumulates high concentrations of bitter tannins in its bark and leaves to deter herbivores and insect pests.
Measurements & details
- Length
- 1000-4500 cm
- Lifespan
- 150-300 years
Diet & Feeding
As a photoautotrophic plant, the tanoak produces its own energy through photosynthesis, utilizing sunlight, carbon dioxide, and water.
Primary Foods
- Sunlight
- Water
- Carbon Dioxide
- Soil Minerals
Ecological connections
parasite
Sudden Oak Death Oomycete
Phytophthora ramorum
Tanoak serves as a critical food source and host to this destructive water mold pathogen.
mutualism
California Scrub-Jay
Aphelocoma californica
The scrub-jay feeds on and caches tanoak acorns, aiding in the tree's seed dispersal and propagation.
eaten by
Mule Deer
Odocoileus hemionus
Mule deer browse the leaves and twigs of tanoak seedlings and consume its highly nutritious acorns.
Traits
No trait badges are assigned for this object yet.
Also known as
No aliases listed yet.
Collections
Collections for this object will appear here as more themes are added.
Safety
Danger
1/5 · Very low
No special safety notes yet.
Frequently Asked Questions
How long is Tanoak?
1000-4500 cm
How long does Tanoak live?
150-300 years
What does Tanoak eat?
As a photoautotrophic plant, the tanoak produces its own energy through photosynthesis, utilizing sunlight, carbon dioxide, and water.
Where is Tanoak usually found?
Found in moist coastal forests, mixed evergreen woodlands, and redwood ecosystems of California and Oregon.
Snap Map
Zoom in to split clusters and explore where this object has been snapped.
Loading map…
Recent Snaps
Recent snaps will appear here as new observations are added.
Where to spot
Park25 sightings12 species
California, US
Armstrong Redwoods State Natural Reserve
You might spot Redwood Sorrel, Redwood, and Button's Banana Slug.
View guide →
Park30 sightings12 species
California, US
Benbow Lake State Recreation Area
You might spot Redwood, Pacific Trillium, and Evergreen Huckleberry.
View guide →
