Gee Whiz! I grow a lot of species tuberous but I've never seen one do that before. It looks as though it never went fully dormant as the stems usually fall apart when the season is over. It makes me wonder what the roots/tuber on thebottom of the stem look like. I wouldn't do anything but observe for awhile. I think, ahead, you can cut it free and pot it like any ordinary tuber trying to breakdormancy and survive.

I have been traumatized by your post! B. boliviensis is also a ROACH! I made the mistake of a search. Stranger still is that people are posting about roaches and comparing roach pictures. However, giving the location of a hole in the wall nursery that is worth a visit has offset the roach thing a bit.

Peggy,

There's an aroid whose genus name (I won't give it to you) is the same as a parasitic worm. I didn't realize until I did that search that the names of plant and animal genera can be repeated. That one is much worse than a roach.

I just wanted to follow up with a picture of what that dormant plant turned into. I did not repot it or remove the aerial tuber. No growth appeared on the partially buried tuber, although there are dormant buds.

The plant was situated as below only for the photo, the 4 inch pot jammed between a gap on the fence gate.

{{gwi:431868}}

I did see the plant that I gave to a friend a couple years ago. It is much, much bigger than it was originally, and is growing upright, unlike the plant here.