Adirondackman,
I make all of my arrow shafts from native Michigan wood. I make them from Maple, Black and White Ash, Walnut, Paper Birch, Red Elm both species of Oak, Poplar and Cedar. For the last several years I prefer the Black Ash. I can't help with using saplings or twigs etc. I cut my rough outs from fully quarter sawed sticks. I cut them into squares 3/8 X 3/8 for example and then carve and sand them to shape. The quarter sawed wood lets me run the grain dead center down the length of the shaft and make for very robust arrows.
I pick the wood type based on weights (density) of the wood and the purpose I'm going to use it for. The cedar, elm and walnut are the most flexible, and the ash, oak, maple and paper birch are hell for tough. The straight grain in the arrow shafts also makes straightening very easy and dependable.
I have made up a chart of relative weights by species if that would help you any. Personally I like the hardwood arows for their weight and thoughness (longevity) not mention they are very hard to damage when I decide for no good reason to fling one out through the toolies (scientific term).
half eye