Plant cespitose; leaves furrowed, to 70 cm long, 8 mm wide; culms trigonous, tall, sometimes to 120 cm; inflorescence a thick globose cluster, ~15 mm across; spikelets mostly dark brown, ~4 mm long (minus the length of the exserted achene tubercle); achenes ~4 mm long, lenticular, smooth, dark brown with a pale center; tubercle dark brown, furrowed, as long as or slightly longer than the achene body; bristles retorsely barbed, tightly clasping the achene body, equaling or slightly shorter than the tubercle.
Common in boggy margins of blackwater creek, with Carex glaucescens, Chasmanthium ornithorhynchum, Lobelia rogersii, Rhynchospora corniculata, Xyris iridifolia.

Leaves filiform/narrowly linear, to 10 cm; culms filiform, to 45 cm; inflorescence a dense terminal (occasionally axillary) cluster of spikelets, ~15 mm across; spikelets 3-4 mm long; achenes small, ~2 mm, smooth or nearly so; tubercle relatively long, compressed-triangular, white, setose; achene bristles antorsely barbed, the longest ones at least a mm longer than the achene. Occasional in damp margins of acidic seep.
Couldn’t get very good pics of the achenes & bristles because they were all in really poor shape (maybe by seasonality)

Plants densely cespitose, the leaves linear; culms nodding; inflorescence drooping, the spikelets closely appressed to the rachis; achenes elongate, ~3 mm long, the body brown-colored, rugose, the tubercle white, setose; achene bristles ~5 mm long, golden colored, upwardly barbed. Common in mesic to wet pine savanna.

Smilax walteri? Frequent in gum swamp lining blackwater creek. Plants shaded, in rich muddy substrate. Leaves and stems finely but conspicuously scurfy. Leaf margins especially thin, wavy; no prominent marginal vein exposed after thumbnail test. Leaf blade tough rather than membranous, but thin and papery, somewhat like more fragile Smilax pumila leaves.
Pic 2 shows upper surface; pic 3 shows lower surface; pic 4 shows side-by-side of upper surface (left) and lower surface (right)

Phyllaries remind me of Sericocarpus, but the leaves are flat and nearly linear (ruling out S. tortifolius) and the margins are entire (ruling out S. asteroides). Locally common in overgrown pine savanna.