WOW,
you did that with basswood? incredible.
all the basswood around here is so soft thatifn you made a bow from it, the first time you pulled it. it would probably stay in the shape it was in at fulldraw.
i dont know if this will help ya identify the two,the elms taht we have here in mn all have flat round seeds,the basswoods have round seeds,about the size of a bb,and when they are dry and you step on them they make a popping sound.
dang i stiil cant believe you did that with basswood
peace
tim