Females are very small, 1/4" long, emerge in spring at the ends of branches.
Bark is smooth gray/silver eventually developing flattened areas with shallow fissures.
Other alders. Look at the "cone", its the largest of all the Alders. Also, the leaves are very heart shaped, without deep venation.
102 Pebble Beach
Temple Beth El on Soquel Drive and Porter Gulch Rd
Monterery Blvd at the sports field, there are 3-5 of them in the grass planing area. (There is an Alnus rhombifolia across the street in a residence front yard.)