ML070720274
| ML070720274 | |
| Person / Time | |
|---|---|
| Site: | Susquehanna  |
| Issue date: | 03/07/2007 |
| From: | - No Known Affiliation |
| To: | Office of Nuclear Reactor Regulation |
| ALICIA MULLINS 301-415-1224 | |
| References | |
| Download: ML070720274 (1) | |
Text
Carex haydenii in Flora of North America @ efloras.org All Floras Advanced Search FNA Vol. 23 Page 395 Login l eFloras Home l Help FNA l Family List l FNA Vol. 23 l Cyperaceae l Carex 192. Carex haydenii Dewey, Amer. J. Sci. Arts, ser. 2. 18: 103. 1854.
Carex de Hayden Carex acuta Linnaeus var. erecta Dewey; C. rousseaui Raymond; C. stricta Lamarck var. decora L. H. Bailey; C. stricta var. haydenii (Dewey) KÃ1/4kenthal Plants cespitose. Culms acutely angled, 30â115 cm, scabrous. Leaves: basal sheaths red-brown, indistinctly ladder-fibrillose; sheaths of proximal leaves glabrous, fronts with red-brown spots, veinless, apex U-shaped; blades 3â5 mm wide. Inflorescences: proximal bract subequal to inflorescence, 2â4 mm wide. Spikes erect; proximal 2â3 spikes pistillate, 1â5 cm à 4â 6 mm, base obtuse; terminal 1â2 spikes staminate. Pistillate scales red-brown, longer than perigynia, apex acute or acuminate, awnless. Perigynia divergent, olive-brown with red-brown spots on apical 1/2, veinless, inflated, loosely enclosing achenes, obovoid, 1.5â2.8 à 1.5â2 mm, dull, apex rounded, papillose; beak green, 0.1â0.2 mm. Achenes not constricted, glaucous. 2n = 54.
Fruiting JunâAug. Wet meadows, moist prairies; 0â1,000 m; N.B., Ont., Que.; Ill., Ind., Iowa, Maine, Mass., Mich., Minn., Mo., Nebr., N.H., N.Y., N.Dak., Ohio, Pa., S.Dak., Vt., Wis.
Carex haydenii is a species of seasonally saturated soils in open habitats. It appears to be declining in abundance with changes in land use.
Carex haydenii is often confused with C. stricta; it can be identified by the inflated perigynia that are rounded apically, acute scales, and glabrous leaves and sheaths. Only basal sheaths of C. haydenii are ladder-fibrillose. Although often sympatric with C. stricta and C. nigra, no hybrids appear to be formed.
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