noun. An evergreen tree (Lithocarpus densiflorus) native to California and Oregon, having leathery leaves, seeds that are similar to acorns, and tannin-yielding bark.

noun. Notholithocarpus densiflorus, an evergreen tree of the beech family, native to the western United States, whose seeds resemble the acorns of an oak.

"Broadleaf evergreens, such as tanoak and madrone, quickly colonize disturbed areas, making it difficult to regenerate conifer forest growth."