California Laurel

What is California laurel?

The California laurel (Umbellularia californica) is an aromatic evergreen tree belonging to the laurel family (Lauraceae). Native to the Pacific coast of North America, ranging from Oregon to California, it typically reaches heights of 15 to 25 meters (50 to 80 feet).¹²

The tree is characterized by its oblong or oval, smooth-edged leaves, which emit a strong, pungent aroma when crushed. It produces dense clusters of yellow-green flowers and egg-shaped fruit that transitions from yellowish-green to purple as it matures. Due to its handsome appearance, it is frequently cultivated in gardens and along avenues.¹

What other plants belong to the Lauraceae family?

The Lauraceae family, also known as the laurel family, comprises approximately 50 genera and over 2,500 species of mostly evergreen trees and shrubs. Many members of this family are economically significant, valued for their fruits, spices, and timber.³⁴

Notable plants within the Lauraceae family include:

• Avocado: A highly nutritious fruit-bearing tree belonging to the genus Persea.³⁴
• Cinnamon: Derived from the inner bark of trees in the genus Cinnamomum, which also provides camphor and the spice cassia.³⁴
• Bay laurel: Also known as the sweet bay tree (Laurus nobilis), its leaves are widely used as a culinary flavoring.³⁴
• Sassafras: A genus including the North American S. albidum, historically used in herbal medicine and as a flavoring.³⁴
• Spicebush: Specifically the North American species Lindera benzoin.³
• Greenheart: A valuable, durable timber tree native to South America.³⁴
• Cassytha: An unusual, rootless, vinelike parasitic plant³.

Other major genera include Ocotea, Litsea, Cryptocarya, Nectandra, and Beilschmiedia, which are distributed primarily across tropical and subtropical regions.³

How do animals interact with the California laurel tree?

The provided information does not contain details regarding how animals interact with the California laurel tree.

Why do the leaves of this tree have such a strong scent?

The strong, pungent aroma of the California laurel (Umbellularia californica) and other members of the Lauraceae family is primarily due to the presence of numerous ethereal oil cavities within their leaves, wood, and bark. These specialized cells produce aromatic compounds that serve as a chemical defense mechanism against herbivory.¹⁷

In the case of the California laurel, this scent is specifically attributed to an unsaturated oily compound known as umbellulone. By producing such defensive chemicals—often referred to as aromatic terpenes—plants can deter insects and other herbivores from consuming their tissues. This evolutionary strategy is common among many Laurales, helping them protect their foliage and maintain their health in various environments.⁴⁸⁷¹⁹