Additional tree species comprising forests adjacent to riparian areas included Grand Fir (Abies grandis), Western Hemlock (Tsuga heterophylla), Pacific Madrone (Arbutus menziesii), Red Alder (Alnus rubra), Big-leaf Maple (Acer macrophyllum), and California Bay Laurel (Umbellularia
Wang et al., "Comparative investigation of Umbellularia
californica and Laurus nobilis leaf essential oils and identification of constituents active against Aedes aegypti" Journal of Agricultural and Food Chemistry, vol.
There are other varieties of bay, including California bay, Umbellularia
Carter (2002) observed 270 plants in 2001 and a patchy overstory (California bay Umbellularia
Blue gum can accumulate 68,000 pounds per acre (lb/ac) of dropped limbs, bark and leaves (76,000 kilograms/hectare [kg/ha]), compared to 42,000 lb/ac (47,000 kg/ha) for California bay (Umbellularia
lauricola indicate that California bay laurel (Umbellularia
californica [Hook & Arn.] Nutt.) and Gulf licaria (Licaria triandra [Sw.] Kosterm.) also are susceptible (Fraedrich 2008; Ploetz & Konkol 2013).
The aggregation site was oriented in a northeastern direction and fully shaded from direct sunlight by the bedrock ledge and by a mature riparian canopy of interior live oaks (Quercus wislizeni), California bay laurels (Umbellularia
californica), and big-leaf maples (Acer macrophyllum).
A specific acyl-ACP thioesterase implicated in medium-chain fatty acid production in immature cotyledons of Umbellularia
Morphological and ontogenetic studies of Umbellularia
It is perhaps significant that, in the warm-temperate zone, the Lauraceae are among the dominants in most natural warm-temperate rainforests, but (apart from Chile; Oberdorfer 1960) are absent from most mediterranean-climate vegetation or are confined to sites with a reliable groundwater supply (e.g., Laurus nobilis and Umbellularia
californica; Walter 1968).
However, over indulgence in the fine aroma of the Headache Tree (Umbellularia
californica) repays with a splitting headache after one or two hours."
ABELIA BREATH OF HEAVEN (Coleonema, Diosma) CALIFORNIA BAY (Umbellularia
californica) CAMELLA CORKSCREW WILLOW (Salix babylonica 'Crispa') DOGWOOD (Cornus) EUCALYPTUS EUONYMUS JAPONICA 'SILVER QUEEN' HOLLY (llex) LEPTOSPERMUM LILAC (Syringa) LOQUAT (Eriobotrya japonica) MAGNOLIA MAPLE (Acer) MOCK ORANGE (Philadelphus) NANDINA PITTOSPORUM 'MARJORIE CHANNON' PODOCARPUS PRUNUS (evergreen) PUSSY WILLOW (Salix discolor) PYRACANTHA RHAMNUS ALTERNATUS 'AUREO VARIEGATA' SPIRAEA SWEET BAY (Laurus nobilis) VARIEGATED WEIGELA VIBURNUM WAX-LEAF PRIVET (Ligustrum japonicum)