Fraxinus profunda tree to 40 m tall; bark much like that of white ash (F. americana), finely network-ridged (reticulate). twigs hairy. Leaf scar more-or-less broadly crescent.
Leaves opposite, compound with 5-9 (usually 7) leaflets. Leaflet stems (petiolules) 0.8-1.5 cm long, blades mostly lance-shaped, tip long-pointed, margin smooth (or nearly so); underside hairy, base pointed to rounded, often with unequal sides (inequilateral).
Flowers mostly unisexual (monoecious); 4-parted no petals.
Fruit dry, 1-seeded, winged (a samara), linear to spatula-shaped, 4-7.5 cm long, 0.7-1.2 cm wide, body cylindrical, wing flattened and over 0.7 cm wide, extending to at least middle of body.
Wetland status: OBL
Frequency in NYC: Very infrequent.
Habitat: Wet woods, swamps.