Carolina Ash?
Did you see the samara? They tend to stick around gutters all year.
The comparison table at the bottom of the page seems helpful.
http://www.rnr.lsu.edu/plantid/species/carolash/carolash.htm
Since there seems to be interest, let's make sure it is open sourced.
Summary:
A system utilizing spring tension to pull a device along rope
This system is thought to be most useful for tending a knee ascender by pulling the ascender up the rope or by removing slack from the rope. The spring...
I'm lucky enough to have gotten a Saka last year shortly after I started tree climbing. Works well and doesn't get in the way.
I read the Haas patent and it appears to me the only claim that could possibly overlap is that 'a hollow core' with elastic inside is used. Many of the claims are...