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Rhynchospora glomerata (L.) Vahl  
Family: Cyperaceae
Clustered Beak Sedge, more...clustered beaksedge
[Rhynchospora glomerata var. discutiens C.B.Clarke ex Britton, moreRhynchospora paniculata]
Rhynchospora glomerata image
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  • Gleason & Cronquist
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Robert Kral in Flora of North America (vol. 23)
Plants perennial, cespitose, 80-150 cm; rhizomes absent. Culms excurved nodding, leafy, triangular, slender; principal leaves overtopped by culm; blades flat, 2.5-5 mm wide, apex attenuate, trigonous. Inflorescences terminal and axillary, spikelet clusters mostly 2-6, compact, turbinate to hemispheric, 1.5-2 cm wide; peduncles progressively shorter distally on culm; bracteal leaves mostly exceeding subtended groups. Spikelets crowded, deep red brown, lance ellipsoid, 4.5-6.5 mm; fertile scales ovate lanceolate, 3.5-4(-4.5) mm, apex acute, midrib mostly short excurrent. Flowers: perianth bristles 6, overtopping tubercle, antrorsely barbellate. Fruits (1-)2(-3) per spikelet, 3-4 mm; body dark red brown with pale center, stipitate, lenticular, obovoid, or orbicular, 1.5-2 × 1.2-1.4 mm, base narrowed, margins pale, wirelike; surfaces slick; tubercle triangular-subulate, 1.3-1.5(-1.8) mm. Fruiting summer-fall. Moist to wet meadows, swales, fens, flatwoods, and bogs, 0-500 m; Ala., Ark., Del., Fla., Ga., Ill., Ky., La., Md., Miss., N.J., N.C., Okla., S.C., Tenn., Tex., Va., W.Va. Rhynchospora glomerata is often associated with R. capitellata and is distinguishable by its taller, slightly stouter habit; longer, slightly paler spikelets; and longer and broader fruit body. It is a common lowland weed in the southern Piedmont, Atlantic coastal plain, and Gulf coastal plain, where it is often more associated with R. inexpansa.

Vascular plants of NE US and adjacent Canada
Much like no. 11 [Rhynchospora capitellata (Michx.) Vahl; lvs to 5 mm wide; frs (1)2-3; bristles 3.2-3.7 mm, equalizing or surpassing the tubercle; achenes with an evident pale umbo and heavy, wire-like raised margin; tubercle 1.3-1.8 mm. Bogs and wet sand; Fla. to Tex., n. on the coastal plain to N.J. and inland to Ky. and Ark.

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

©The New York Botanical Garden. All rights reserved. Used by permission.
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