(Interpretable credibly as synonym of P. plumosa---see below)

Distribution:  Florida, Cuba

Habitat:  Varied.   Moist sandy areas with sawgrasses

Recognition:  Small grassy species. Spikelets few,  in a lax arrangement. Achene rugose, the bristles plumose, exceeding the achene. Key to species with plumose perianth bristles:

1.  Spikelets 8-10 mm long,..Rhynchospora  megaplumosa (Bristles plumose, 5-7.5 mm long, much longer than achene (this > 2 mm).  The bristles pushing outward, MUCH longer than in R. plumosa or R. pineticola.)

1. Spikelets 3.5-6  mm long…2

2.  Achene body (1.5)2-2.2 mm long, the tubercle 0.5-0.8(1) mm long; bristles exceeding the tubercle; leaves (1)2-3 mm wide…Rhynchospora pineticola (Synonym of R. intermedia in Wunderlin and see comment below re. R. plumosa)

2.  Achene body 1.3-1.8 (2) mm long, the tubercle 0.3-0.5 mm long, the bristles shorter or longer than the tubercle tip; leaves 1-1.5 mm wide…Rhynchospora plumosa

Note!   In: Godfrey, R. K. & J. W. Wooten, Aquatic and Wetland Plants of Southeastern United States, Monocotyledons. P. 370.  Rhynchospora intermedia (R. pineticola) is treated as a synonym of R. plumosa with a brief discussion of the authors' inability to discern two separate taxa.  We experience the same difficulty.

From FNA:  "Rhynchospora pineticola is distinguished from taller extremes of R. plumosa by its thicker leaves and scapes and its longer spikelets and fruit. Its bases are a deep rich red-brown rather than the pale brown or dull deep brown of R. plumosa." 

Florida status:  Native

Immature achene: