what's tree do you know ?

Some type of ash, Fraxinus species. In my area it would likely be white ash, Fraxinus americana, but I don’t know where you are in zone 8, and so don’t know what types of ash trees are common to your area.

Parent tree may be visible in vicinity

thanks, my garden don't have ash tree , am in north california zone 9b .

Seeds get moved by wind, water, vehicles, and critters, so embo’s vicinity may be several yards away.