Oregon-myrtle Umbellularia californica
Other Common Name(s):
Previously known as:
- Oreodaphne californica
- Tetranthera californica
- Phonetic Spelling
- um-BEL-ew-lah-ree-a ka-li-FORN-i-ka
- Description
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California bay is a medium to a large native ornamental broadleaf evergreen tree or shrub that has an upright, dense, and rounded habit. In Oregon, it is known as the Oregon myrtle. It may grow from 30 to 75 feet tall and 30 to 75 feet wide. It tends to grow larger near water and is more shrub-like in drier areas. The leaves are dark green, shiny, lanced-shaped, and aromatic. In the spring, tiny creamy-colored fragrant flowers appear in clusters. The fruits are rounded to elliptical and green to purple drupes that ripen in the fall. The foliage, twigs, and flowers of this tree are very aromatic. It is a member of the Lauraceae or Laurel family, and it is the only species in the genus Umbellularia.
This tree is native to southwest Oregon and portions of California. It is typically found in the Pacific coastal range, the Sierra Mountains, the southern portions of California, and northwest Mexico. They are found in moist canyons and near ponds or streams. The tree was introduced as an ornamental by David Douglas in 1829.
The genus name, Umbellularia, is derived from its umbel-shaped blooms. The species name, Californica, means "of California" which references its native habitat. Many of its common names are derived from the characteristics of its leaves, fruits, or wood.
The California bay prefers full sun to partial shade. It requires moist, loamy, sandy, or clay soils with an acid to neutral pH. This tree does well in coastal forests and along stream edges. It can be trained to be a large shrub, but heavy pruning should be avoided.
The California bay is not related to the myrtle or laurel trees of the Mediterranean. This tree's wood is typically used for woodworking commercially. The USDA recommends exercising caution if using any portion of this tree as food, seasoning, or medication because of its strong chemical properties. This tree should not be used as a source of bay leaves used in cooking.
The leaves of the California bay release pungent oils when they are crushed or torn. Contact with the leaves may cause skin irritation in some people, and the fragrance may also cause sneezing and headaches.
This tree is enjoyed by birds and small mammals as a source of food, shelter, and habitat. Consider this tree in a park or open space for shade or screening. It may also be used on banks and slopes for soil stabilization.
Seasons of Interest:
Bark: Year-round Bloom: Spring Foliage: Year-round Fruit: Fall
Quick ID Hints:
- aromatic, broadleaf evergreen tree or shrub
- mature bark reddish-brown and scaly
- aromatic, smooth. slender twigs that are light green initially and turn grayish-brown with maturity
- aromatic dark green, lance-shaped leaves, upper surface smooth and shiny, lower surface dull light green and smooth to sparsely hairy
- tiny fragrant creamy-white to pale yellow flowers arranged in short-stemmed umbels of 4 to 9 flowers
- small round to elliptical drupe ranging in colors of green, greenish-yellow, or purple
Insects, Diseases, and Other Plant Problems: The California bay has no serious insect problems. Beetle borers, leaf blotch miner, thrips, and cushion scale may be seen. It is the primary host of a fungus that causes a disease known as Sudden Oak Death. Armillaria or Honey fungus, anthracnose, and white mottled rot may also occur. This tree is also susceptible to wind and snow damage in its native habitat due to severe wind and rainstorms.
VIDEO created by Ryan Contreras for “Landscape Plant Materials I: Deciduous Hardwoods and Conifers or Landscape Plant Materials II: Spring Flowering Trees and Shrubs” a plant identification course offered by the Department of Horticulture at Oregon State University
- Profile Video:
- See this plant in the following landscape:
- Cultivars / Varieties:
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- Umbellularia californica var. californica
- Umbellularia californica var. fresnensis
- Umbellularia californica var. californica
- Umbellularia californica var. californica, Umbellularia californica var. fresnensis
- Tags:
- Cultivars / Varieties:
-
- Umbellularia californica var. californica
- Umbellularia californica var. fresnensis
- Umbellularia californica var. californica
- Umbellularia californica var. californica, Umbellularia californica var. fresnensis
- Tags:
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Attributes:
- Genus:
- Umbellularia
- Species:
- californica
- Family:
- Lauraceae
- Uses (Ethnobotany):
- Native Americans used portions of the tree for medicinal purposes to treat poison oak dermatitis. It has also been used as an insecticide to repel fleas. The wood is very hard and is used for cabinets, veneer for furniture, interior trim, and woodenware.
- Life Cycle:
- Woody
- Recommended Propagation Strategy:
- Seed
- Stem Cutting
- Country Or Region Of Origin:
- Southwest Oregon to Mexico
- Distribution:
- California, Mexico Northwest, and Oregon
- Wildlife Value:
- Insects are attracted to the blooms and aid in pollination. Birds, squirrels, and mice feed on the seeds and use the tree for shelter. In the early spring, deer and goats may eat the young sprouts when the leaves are less aromatic.
- Play Value:
- Attractive Flowers
- Fragrance
- Screening
- Shade
- Wildlife Cover/Habitat
- Wildlife Food Source
- Wildlife Larval Host
- Particularly Resistant To (Insects/Diseases/Other Problems):
- Verticillium
- Edibility:
- The leaves, seeds, and wood have strong chemical properties. Exercise caution if any part of this tree is used for food, seasoning, or medicinal purposes.
- Dimensions:
- Height: 30 ft. 0 in. - 75 ft. 0 in.
- Width: 30 ft. 0 in. - 75 ft. 0 in.
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Whole Plant Traits:
- Plant Type:
- Shrub
- Tree
- Woody Plant Leaf Characteristics:
- Broadleaf Evergreen
- Habit/Form:
- Dense
- Erect
- Rounded
- Growth Rate:
- Medium
- Maintenance:
- Low
- Texture:
- Medium
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Cultural Conditions:
- Light:
- Full sun (6 or more hours of direct sunlight a day)
- Partial Shade (Direct sunlight only part of the day, 2-6 hours)
- Soil Texture:
- Clay
- Loam (Silt)
- Sand
- Soil pH:
- Acid (<6.0)
- Neutral (6.0-8.0)
- Soil Drainage:
- Good Drainage
- Moist
- Available Space To Plant:
- 24-60 feet
- more than 60 feet
- USDA Plant Hardiness Zone:
- 7a, 7b, 8a, 8b, 9a, 9b
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Fruit:
- Fruit Color:
- Gold/Yellow
- Green
- Purple/Lavender
- Fruit Value To Gardener:
- Showy
- Display/Harvest Time:
- Fall
- Fruit Type:
- Drupe
- Fruit Length:
- < 1 inch
- Fruit Width:
- < 1 inch
- Fruit Description:
- Each umbel has one to three fruit sets. The fruit is usually a solitary drupe that measures 0.75 inches in diameter and contains a single nutlike seed. The drupe may be elliptical to round, and it is initially green then changes in color from yellowish-green to purple. The drupes ripen in the fall.
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Flowers:
- Flower Color:
- Cream/Tan
- Gold/Yellow
- White
- Flower Inflorescence:
- Umbel
- Flower Value To Gardener:
- Fragrant
- Flower Bloom Time:
- Spring
- Flower Size:
- < 1 inch
- Flower Description:
- The flowers are clusters of fragrant creamy white or pale-yellow blooms that appear in the early spring from April to May. They bloom profusely and continue intermittently for several months. The flowers are 0.6 inches in diameter and grow on short-stemmed umbels. Each umbel has four to nine flowers.
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Leaves:
- Woody Plant Leaf Characteristics:
- Broadleaf Evergreen
- Leaf Color:
- Green
- Leaf Feel:
- Leathery
- Leaf Value To Gardener:
- Fragrant
- Leaf Type:
- Simple
- Leaf Arrangement:
- Alternate
- Leaf Shape:
- Elliptical
- Lanceolate
- Oblong
- Leaf Margin:
- Entire
- Hairs Present:
- Yes
- Leaf Length:
- 1-3 inches
- Leaf Width:
- < 1 inch
- Leaf Description:
- The leaves are dark green, aromatic, leathery, and measure 1 to 4 inches long and 0.5 to 1-inch wide. They are alternate and lanceolate to narrowly oblong to elliptical. The base and apex are pointed, and the margins are entire. The upper surface is shiny, smooth, and darker green. The undersides are dull, smooth to sparsely hairy, and lighter green.
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Bark:
- Bark Color:
- Dark Brown
- Light Brown
- Light Gray
- Red/Burgundy
- Surface/Attachment:
- Scaly
- Smooth
- Bark Description:
- The young bark is smooth, thin, and grayish-brown. As the tree matures the bark becomes scaly and reddish-brown.
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Stem:
- Stem Color:
- Brown/Copper
- Gray/Silver
- Green
- Stem Is Aromatic:
- Yes
- Stem Cross Section:
- Round
- Stem Surface:
- Smooth (glabrous)
- Stem Description:
- The twigs are aromatic, round, slender, and smooth. They are light green and transition to grayish-brown with age.
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Landscape:
- Landscape Location:
- Coastal
- Pond
- Riparian
- Slope/Bank
- Design Feature:
- Flowering Tree
- Screen/Privacy
- Shade Tree
- Resistance To Challenges:
- Deer
- Salt
- Problems:
- Contact Dermatitis