Acid green

This is another bush, dog walking, late summer fruits and seeds blip (expect more). This small tree/shrub is absolutely covered in these tiny (maybe 0.5 cm?), astonishing, acid green berries. A feast for our feathered friends.

This time I'm left guessing. The tree/shrub looks indigenous but I have no idea what it is. Cabbagetree might be able to help???