Alnus rhombifolia

White alder, a reference photo
Photo: US NPS Santa Monica Mountains National Recreation Area [2] · Public domain

Alnus rhombifolia, the white alder, is an alder tree native to western North America, from British Columbia and Washington east to western Montana, southeast to the Sierra Nevada, and south through the Peninsular Ranges and Colorado Desert oases in Southern California. It occurs in riparian zone habitats at an elevational range of 100–2,400 metres (330–7,870 ft). While not reported in northern Baja California, it has been predicted on the basis of its climatic adaptation to occur there also. Alnus rhombifolia is primarily found in the chaparral and woodlands, montane, and temperate forests ecoregions.

From Wikipedia, under CC BY-SA 4.0.

Is it poisonous?

We have no record of White alder being toxic, poisonous or venomous. That is not proof that it is safe. Never eat, touch or handle a wild plant, mushroom or animal on the strength of an identification; ask someone qualified.

Easily confused with

Classification

Kingdom
Plantae
Phylum
Tracheophyta
Class
Magnoliopsida
Order
Fagales
Family
Betulaceae
Genus
Alnus
Species
Alnus rhombifolia

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More species

White alder (Alnus rhombifolia) · B.inomen