Weird Pleistocene Plant parts? New Mexico

[Crowmagnon]

I collected these presumed plant parts at a late Pleistocene site in Roosevelt Co., NM. 

They are mineralized, and came out of the same layer of sediment as Mammoth, Equus, Ground Sloth, etc.

 

The triangular "stem" parts remind me of Sedge, but I'm not sure.

[Plantguy]

See this thread from years ago that Rich started...

 

Regards, Chris 

[Crowmagnon]

2 hours ago, Plantguy said:

See this thread from years ago that Rich started...

 

Regards, Chris 

Thank you!  I was never able to get anywhere with these before.