Apparent stump of cut-down giant reed, growing on disturbed soil at the edge of former agricultural plots and vacant lots, Ontario, CA. Coin used for scale is a US quarter dollar (¢25 piece), 24.26 mm, 0.955 inch in diameter.
Observed a few clumps of variegated arundo amongst the old roots on the berms in the area
On the side of the trail across from Arroyo Burro Creek
Literally have no idea what this is- it didn’t smell like anything even after breaking it open