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Pale Spike Rush

Eleocharis flavescens (Poir.) Urb.

Comments

provided by eFloras
The varieties of Eleocharis flavescens are difficult to delimit, especially in the south, and identifications of some specimens to variety are problematic.
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Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 23: 63, 100, 101 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
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Description

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Plants with creeping rhizomes 0.5–1 mm thick. Culms 3–42 cm × 0.3–0.6 mm. Leaves: distal leaf sheaths often disintegrating, thinly membranous-translucent, inflated distally, often wrinkled, apex blunt. Spikelets ellipsoid, 1.5–9 × 1–3.5 mm, apex acute to acuminate; proximal scale without flower, not amplexicaulous; floral scales to 65, 5–7 per mm of rachilla, loosely appressed to appressed, elliptic, 1–3 × 0.4–1.6 mm, membranous, apex acute. Flowers: perianth bristles (0–)5–8, typically 7, white to stramineous, spinules dense to few; styles 2-fid, rarely 3-fid. Achenes stramineous to green or dark brown, biconvex, rarely trigonous, obovoid to obpryiform, 0.4–1.1 × 0.3–0.8 mm, very finely reticulate at 40X. Tubercles whitish to stramineous or green, 0.2–0.7 × 0.2–0.4 mm, apex acute to acuminate.
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cc-by-nc-sa-3.0
copyright
Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 23: 63, 100, 101 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
source
Flora of North America @ eFloras.org
editor
Flora of North America Editorial Committee
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eFloras.org
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eFloras

Synonym

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Scirpus flavescens Poiret in J. Lamarck et al., Encycl. 6: 756. 1804
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Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 23: 63, 100, 101 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
source
Flora of North America @ eFloras.org
editor
Flora of North America Editorial Committee
project
eFloras.org
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eFloras

Comprehensive Description

provided by North American Flora
Eleocharis flavescens (Poir.) Urban, Symb. Ant 4:116. 1903.
Scirpus flavescens Poir. in Lam. Encyc. 6: 756. 1804.
? Scirpits flaccidus Reichenb. ; Sprang, f. Tent. Suppl. Syst. 3. 1828. (Suriname.)
Baeothyron flavescens A. Dietr. Sp. PI. 2: 91. 1833.
Scirpus Gaudichaudianus Kunth, Enum. PI. 2: 157. 1837. (Brazil.)
Eleogenus ocreatns Nees in Mart. Fl. Bras. 2^: 102. 1842, in part. (Probably from Brazil.)
Eleocharis ochreata Steud. Syn. Cyp. 79. 1855.
Scirpus bahiensis Steud. Syn. Cyp. 83. 1855. (Brazil.)
Scirpus ocreatus Griseb. Fl. Brit. W. Ind. 570. 1864.
Heleocharis albivaginata Bock. Linnaea 36 : 437. 1870.
Scirpus anisochaetus C. Wright in Sauv. Anal. Acad. Ci. Habana 8: 80. 1871. (Cuba.)
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bibliographic citation
Henry Knut Svenson. 1957. (POALES); (CYPERACEAE); SCIRPEAE (CONTINUATIO). North American flora. vol 18(9). New York Botanical Garden, New York, NY
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Eleocharis flavescens

provided by wikipedia EN

Eleocharis flavescens is a perennial flowering plant species called bright green spikerush, pale spike-rush, or wrinkle-sheathed spike-rush;[3] it is a member of the sedge family, Cyperaceae. It is clump-forming species that also spreads into colonies. It is a small species that looks similar to other Spikerush species. It is native to temperate North America, the West Indies, and South America.[3]

Varieties

There are two varieties.[3]

Eleocharis flavescens var. olivacea (Torr.) Gleason: is found along shorelines in eastern North America along the Atlantic coast and inland south of the Great Lakes to Minnesota.[4] It is a short caespitose plant with biconvex, green to dark brown, achenes.[4] The achenes have a two-cleft style and bristles that are as long or longer than the achene.[4] The scales of the achene are rounded with round tips and have a green midrib.[4] In Minnesota it reaches its most westerly distribution and it is listed as a Threatened species because of its rarity.[5] It is a wetland species found in only a few locations in Minnesota but this may be due to under collecting because the species is small and looks like other species. In Minnesota, it has been found growing on a mucky lakeshore in a mixed forest, and along a muddy shoreline of a peat pond.[4]

Eleocharis flavescens var. flavescens: with red-brown to dark brown ripe achenes.[3] It grows in southern and western USA, the West Indies, and South America.[3]

Warm springs spike-rush (Eleocharis flavescens var. thermalis) (13822702854)

References

  1. ^ "The Plant List: A Working List of All Plant Species". Retrieved 4 January 2015.
  2. ^ "Eleocharis flavescens (Poir.) Urb". www.worldfloraonline.org. Retrieved 2020-12-29.
  3. ^ a b c d e "Eleocharis flavescens in Flora of North America @ efloras.org". www.efloras.org. Retrieved 2020-12-29.
  4. ^ a b c d e Barbara Coffin; Lee Pfannmuller (1988). Minnesota's Endangered Flora and Fauna. U of Minnesota Press. p. 91. ISBN 978-0-8166-1689-3.
  5. ^ "Eleocharis flavescens (Bright Green Spikerush): Minnesota Wildflowers". www.minnesotawildflowers.info. Retrieved 2020-12-29.
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Eleocharis flavescens: Brief Summary

provided by wikipedia EN

Eleocharis flavescens is a perennial flowering plant species called bright green spikerush, pale spike-rush, or wrinkle-sheathed spike-rush; it is a member of the sedge family, Cyperaceae. It is clump-forming species that also spreads into colonies. It is a small species that looks similar to other Spikerush species. It is native to temperate North America, the West Indies, and South America.

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