I have seen some lengthy lists of plant species for the western states detailing which species are best for hearth boards and which make good spindles. I have never seen a good list for the eastern states. This thread is filling in that gap.
Here are some items I have been successful with here in Missouri
Hearth boards: baldcypress, eastern red cedar, drift wood cottonwood, drift wood silver maple
spindle: yucca flower stalk, horseweed, ragweed stem.
tinder: dogbane fibers left over from string making, cedar bark shredded, fine shaving from my bow making (hickory, ash, osage orange, etc.)
This thread has some good comments about species and combinations. I like it.