I don't know what it's called, but I'll aptly refer to it as razor grass.
I've encountered this tall razor grass before (hiking, retrieving soccer balls, etc), but flying through it on a bike is whole other adventure in long itchy paper cuts on one's legs.
Went horribly off trail while avoiding a waist high fallen tree at speed and ended up barreling through 3' tall razor grass.
Should have worn pants.
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Thread: Razor Grass