Rhynchospora megaplumosa, the Manatee beaksedge,[1] is a plant species endemic to a small region in central Florida.

It is known from only 4 Counties: Polk, Hillsboro, Manatee and Sarasota.

It generally grows on sandy soil in pine woodlands.

[2][3] Rhynchospora megaplumosa is a perennial herb up to 90 cm tall, often forming clumps.

Spikelets are densely crowded together, tapering at both ends, light brown, about 9 mm long, with bristles nearly twice as long as the fruit, sticking out of the spikelet and giving a feathery appearance.