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Carex rostrata Stokes  
Family: Cyperaceae
beaked sedge, more...Swollen Beaked Sedge
[Carex ampullacea, moreCarex rostrata var. ambigens Fern.]
Carex rostrata image
ASU Fruit & Seed Collection
  • FNA
  • Gleason & Cronquist
  • Resources
Peter W. Ball & A. A. Reznicek in Flora of North America (vol. 23)
Plants colonial; rhizomes long. Culms terete or very bluntly trigonous in cross section, 8-90 cm, smooth distally. Leaves: basal sheaths brown, occasionally tinged with pinkish red; ligules as long as wide; blades whitish green, U-shaped, with involute margins, widest leaves 1.5-4.5(-7.5) mm wide, papillose adaxially. Inflorescences 10-30 cm; proximal bract 18-45 cm, exceeding but no more than 2.5 times longer than inflorescence; proximal (1-)2-3 spikes pistillate, erect or the proximal ascending, ca. 20-150-flowered, cylindric; terminal (1-)2-4 spikes staminate, well elevated beyond summit of separate pistillate spikes. Pistillate scales lanceolate ovate, 2.5-4.5(-8.8) × 0.8-1.6 mm, mostly shorter than perigynia, margins entire, apex acute to acuminate (rarely acuminate-awned). Perigynia spreading, often green or straw colored, 9-15-veined, veins running into beak, ovate, 3.6-5.8 × 1.7-2.8 mm, apex contracted; beak (1-)1.2-2 mm, bidentulate, smooth, teeth straight, 0.2-0.7 mm. Stigmas 3. Achenes brown, symmetric, not indented, trigonous, smooth. 2n = 60. Fruiting Jun-Aug. Fens, especially in flarks in patterned fens, bogs and bog pools, lake and stream shores, often in shallow water or on floating mats; 0-1600 m; Greenland; Alta., B.C., Man., N.B., Nfld. and Labr., N.W.T., N.S., Nunavut, Ont., Que., Sask., Yukon; Alaska, Mich, Minn., Mont., Wash., Wis.; Eurasia. Carex rostrata is infrequent and local in large portions of its range, often forming large colonies where found. Carex rostrata hybridizes with C. oligosperma and C. saxatilis; rare sterile intermediates with C. utriculata are likely hybrids. The vast majority of records of C. rostrata from North America are C. utriculata.

Vascular plants of NE US and adjacent Canada
Similar to no. 218 [Carex utriculata Boott], and often confused with it, but the lvs papillate- glaucous on the upper surface, mostly 1.5-4 mm wide, tending to be involute; perigynia avg smaller; 2n=60, 72, 74, 76. Wet soil or shallow water; circumboreal, s. to n. Mich. and n. Minn.

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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The National Science Foundation
Development supported by National Science Foundation Grants (DBI 9983132, BRC 0237418, DBI 0743827, DBI 0847966)
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