Any way to tell em apart from that stage? Or are there some species that are much weedier? There were a ton of them all over, but all the ashes had been cut down.
Yep--the photo is named dogbane-asclepias-like. It had a milky sap, but I don't know which it could be.
#5 could be some Astragalus or similar from Fabaceae with odd-pinnate leaves. Too few details are visible to make a certain call.
I was looking at photos of ash seedlings, and it seems like by the time their leaves are the size as the ones in the photo, they've developed leaflets. Are you sure it's an ash?
Ditto to an ash seedling for #3; simple non-pinnate leaves like that are normal in the first year. Ash seeds usually stay 1-2 years in the soil before germinating, sometimes longer, so it could very easily be from before all your ashes were removed.
Wondrous, thank you! Do you find that the some of the identifying characteristics between the species (regularity and location of margin serrations, lighter leaf underside) hold true at such a small stage?
The reddish-brown bud fits Green Ash better than White Ash, but I don't know if that's reliable with seedlings at this age.