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Key to Rhynchospora, Key B: beaksedges with basally-white bracts (White-bracted Sedges) [subgenus Diplostylae; section Dichromena]

Cyperaceae

Rhynchospora

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(c) Ward, Scott G - CC-BY
1 Plant cespitose; achene + tubercle 0.8-1.2 mm long; [only FL, OK, TX, and ? AR in our region].
  2 Keel of lower spikelet scales ciliolate; achene tubercle blunt or apiculate; involucral bracts 2-5 mm wide; [s. peninsular FL]
(c) Joseph, Aubert - CC-BY
  2 Keel of lower spikelet scales not ciliolate; achene tubercle with a short (0.2-0.3 mm long) beak; involucral bracts (when present) 0.2-2.0 mm wide; [OK and TX]
1 Plant rhizomatous; achene + tubercle 1.5-2.0 mm long; [relatively widespread in our region, especially Coastal Plain from se. VA to s. FL and west to s. TX, but also rarely inland].
(c) Ward, Scott G
(c) Ward, Scott G
    3 Inflorescence bracts 3-6 (-7); basal bract (1.4-) 2-5 mm wide, the white portion (2.5-) 9-25 mm long, tapering gradually into the green portion; rhizomes slender, straight, (0.6-) 0.7-1.7 (-2.1) mm in diameter; achene 1.0-1.2 mm wide; tubercle broadly truncate on achene
(c) Ward, Scott G - CC-BY
(c) Bradley, Keith
    3 Inflorescence bracts (5-) 6-10; basal bract 5-12 mm wide, the white portion 22-55 mm long, tapering abruptly into the green portion; rhizomes often bent and swollen at the nodes, 1.4-3.8 mm in diameter; achene 1.2-1.5 mm wide; tubercle decurrent on achene