1. (noun) tree of western United States

• alnus rhombifolia
• mountain alder

2. (noun) shrub of eastern and southern coastal United States having beautiful racemes of spice-scented white flowers

• clethra alnifolia
• pepper bush
• summer sweet
• sweet pepperbush

1. (noun) tree of western United States

• alder
• alder tree

2. (noun) shrub of eastern and southern coastal United States having beautiful racemes of spice-scented white flowers

• bush
• shrub

1. (noun) tree of western United States

• alnus
• genus alnus