What is "fraxinus sambucifolia"

Fraxinus \Frax"i*nus\, prop. n. [L., the ash tree.] (Bot.) A genus of deciduous forest trees, found in the north temperate zone, and including the true ash trees.

Note: Fraxinus excelsior is the European ash; Fraxinus Americana, the white ash; Fraxinus sambucifolia, the black ash or water ash.