Answer: Thuja (American arborvitae) is a pyramidal evergreen, growing upwards of 25' and remaining only 2'-4' wide. Other suggestions include Leptospermum (tea tree), Cypress (Cupressocyparis leylandii), and Calocedrus (incense cedar). Pyrus (ornamental pear), Ilex (male holly), and Robina (Idaho locust) are worth considering as well! Full descriptions are in Sunset Western Garden Book which is generally available in libraries. Hope you find just the right trees for your backyard!
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