Rhynchospora inundata
Rhynchospora divergens
inundated beakrush, narrow-fruit beaksedge, narrowfruit horned beaksedge
spreading beaksedge
stiffly erect, leafy, triangular, multiribbed.
erect or spreadingarching, linearfiliform, terete, leafy toward base.
erect, distal ones overtopping inflorescence;
principal blades flat proximally, trigonous distally, 3–10 mm wide, apex attenuate.
overtopped by culm;
blades ascending, filiform, 0.3–0.5 mm wide, margins deeply involute, then channeled, apex trigonous, setaceous.
terminal and axillary, clusters of corymbs (1–)2–3, open, spikelet clusters loose;
bracteal leaves mostly overtopping corymbs.
spikelet clusters 1–2(–4), dense(–open), narrowly to broadly turbinate;
branches capillary, variously elongate; leafy bracts setaceous, proximal exceeding clusters.
pale redbrown, narrowly lanceoloid, (9–)11–14 mm, apex acuminate;
fertile scales lanceolate, 9–13 mm, apex acuminate, midrib shortexcurrent or not.
brownish, lanceellipsoid to fusiform, 2–2.5(–3) mm, apex acute;
fertile scales broadly elliptic, 1.5 mm, apex narrowly rounded to broadly acute, apiculate, convexcupulate, midrib narrow, shortexcurrent or included.
perianth bristles 5–6, extending at least 5 mm beyond tubercle base, antrorsely barbellate.
perianth absent.
1–2 per spikelet, 15–20 mm;
body stipitate, obovoid to oblong, compressed, 4–5 × 2–3 mm, margins thick;
surfaces concave, horizontally finely striate, minutely cancellate;
tubercle stoutbased, grooved, subulate, 10–15 mm, setulose.
1–3 or more per spikelet, (0.6–)0.7–0.9(–1) mm;
body pale, glassy, obovoidlenticular, 0.6–0.7 × 0.4–0.5 mm, margins narrow, wirelike;
surfaces finely striate, very finely reticulate;
tubercle button depressedtriangular or patelliform, 0.1–0.15 mm, apiculate.
Rhynchospora inundata
Rhynchospora divergens
Rhynchospora inundata is largely confined to lower Coastal Plain terraces, mostly along the present coast. Typical plants have narrow fruit bodies and narrow inflorescences of sparse clusters, well overtopped by leaves and erect leafy bracts. By contrast, plants of R. careyana have broader fruits, shorter perianths, and larger, broader inflorescences that overtop most or all leaves and bracts. In general, plants of R. careyana are more robust and grow in more acid sites than those of R. inundata. Southward in the Atlantic Coastal and Gulf Coastal plains are broad areas of ecotone where the two species intergrade.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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