We believe this is the tree Alnus serrulata; Hazel Alder or Smooth Alder. The “Hazel” embedded in the common name is a play on the very similar looks of the leaf shape and presence of catkins, as Hazelnut ( Corylus avellana, Corylus colurna) have, BUT the Hazelnuts have a very odd, small female flower in very early spring, ( tiny strap-shaped petals recurved backwards, really tiny) then maturing seed is “nested” like a small quail egg in the center of what looks like parrot tulip petals, very beautiful.
The solid, green seed pod of Alnus and, the catkin (old and passed but still remnant) and the leaf shape are the key i.d. components. The Alders are in general overlooked as ornamentals, but several species tolerate poor drainage/swampy soils, and are small in mature stature; both valuable attributes in certain landscape situations.
We are not certain of this identification, because the image is a bit blurry. If you get a chance, we’d like to see a close up of the fruit/nut. Thanks.
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