Savanna. Culm 10-15 cm, leaves 11cm, involute. Bract 3-4cm. Spikelet 3mm, fruits 1-2 per spikelet. Achene tightly wrapped, not mature, rugose, biconvex, 1.6 x 1.5mm +0.5mm tubercle. Bristles plumose at least 2/3 of length, bristles extend to end of achene body.
Wet savanna, powerline that is periodically burned and mowed
Savanna. Spikelet 2.5 x 1.5, very hairy. 1st glume constricted, 0.8mm. About 3 cauline leaves. Lowest cauline leaf 75mm x 8mm, about 10x as long as wide. Old autumn leaves still present, narrower. Nodes bearded. Ligule 3mm hairs.
Possible invader? Growing in drain
Vernal lvs up to 8 cm, autumnal about 5, spikelets about 3.0 mm
With @elbourret and Eran Kilpatrick
Otherwise what I initially thought - Ochna?