Cyperaceae taxon details
Eleocharis macrostachya Britton
1680471 (urn:lsid:marinespecies.org:taxname:1680471)
accepted
Species
Eleocharis perlonga Fernald & Brackett · unaccepted
Eleocharis xyridiformis Fernald & Brackett · unaccepted
terrestrial
Not documented
Description Plants perennial, mat-forming; rhizomes evident, long, 1–2 mm thick, firm, cortex persistent, longer internodes 10–55...
Taxonomic remark Source in seed data: wcs Updated scientificnameAuthorship from Britton to Britton in Small, information provided by Alan E....
Description Plants perennial, mat-forming; rhizomes evident, long, 1–2 mm thick, firm, cortex persistent, longer internodes 10–55 mm, scales often fugaceous, 5–10 mm, membranous, not fibrous. Culms terete to markedly compressed, to 3 times wider than thick, often with to 25 blunt ridges when dry, 10–100 cm × 0.5–2.5(–3.5) mm, firm (to soft), internally spongy. Leaves: distal leaf sheaths persistent, rarely splitting abaxially, proximally mostly red, distally green (or red), papery (to membranous), apex truncate to obtuse, tooth sometimes present on some or all culms, 0.1–0.6(–1) mm. Spikelets narrowly lanceoloid to ovoid, 5–40 × 2–5 mm, acute, rarely obtuse; proximal scale clasping (2/3–)3/4 or more of culm to amplexicaulous, usually variably in same plant; subproximal scale empty or with flower, usually empty in some spikelets and with flower in other spikelets in same plant; floral scales deciduous, often spreading in fruit, 30–80, 3–5 per mm of rachilla, medium brown, sometimes red-brown or dark chestnut-brown, midrib regions often stramineous to green, ovate to narrowly lanceolate, 2.5–5.5 × 1.5–2.5 mm, entire, mostly carinate in distal part of spikelet. Flowers: perianth bristles 4(–5), sometimes rudimentary or absent, brown, slender to stout, much shorter than achene to equaling tubercle; stamens 3; anthers dark yellow to orange-brown, 1.3–2.7 mm; styles 2-fid. Achenes not persistent, yellow maturing to yellow-brown or dark brown, ellipsoid, obovoid, or obpyriform, biconvex to plano-convex, angles obscure, 1.1–1.9 × 0.8–1.5 mm, apex rounded, neck absent or short, smooth at 30X, or finely rugulose at 10–20X with 20 or more horizontal ridges in a vertical series. Tubercles brown to whitish, pyramidal, as high as or sometimes much higher than wide, 0.35–0.7 × 0.25–0.7 mm. 2n = 18, 19, 38. [details]
Taxonomic remark Source in seed data: wcs Updated scientificnameAuthorship from Britton to Britton in Small, information provided by Alan E....
Taxonomic remark Source in seed data: wcs Updated scientificnameAuthorship from Britton to Britton in Small, information provided by Alan E. on email Oct. 12 2020 More details could be found in The Plant List [details]
Cyperaceae Working Group. (2025). [see How to cite]. Global Cyperaceae Database. Eleocharis macrostachya Britton. Accessed at: https://cyperaceae.org/aphia.php?p=taxdetails&id=1680471 on 2025-09-12
The webpage text is licensed under a Creative Commons
Attribution 4.0 License
Nomenclature
basis of record
Plants of the World Online (POWO). , available online at https://powo.science.kew.org/ [details]
Present Inaccurate Introduced: alien Containing type locality
From editor or global species database
Description Plants perennial, mat-forming; rhizomes evident, long, 1–2 mm thick, firm, cortex persistent, longer internodes 10–55 mm, scales often fugaceous, 5–10 mm, membranous, not fibrous. Culms terete to markedly compressed, to 3 times wider than thick, often with to 25 blunt ridges when dry, 10–100 cm × 0.5–2.5(–3.5) mm, firm (to soft), internally spongy. Leaves: distal leaf sheaths persistent, rarely splitting abaxially, proximally mostly red, distally green (or red), papery (to membranous), apex truncate to obtuse, tooth sometimes present on some or all culms, 0.1–0.6(–1) mm. Spikelets narrowly lanceoloid to ovoid, 5–40 × 2–5 mm, acute, rarely obtuse; proximal scale clasping (2/3–)3/4 or more of culm to amplexicaulous, usually variably in same plant; subproximal scale empty or with flower, usually empty in some spikelets and with flower in other spikelets in same plant; floral scales deciduous, often spreading in fruit, 30–80, 3–5 per mm of rachilla, medium brown, sometimes red-brown or dark chestnut-brown, midrib regions often stramineous to green, ovate to narrowly lanceolate, 2.5–5.5 × 1.5–2.5 mm, entire, mostly carinate in distal part of spikelet. Flowers: perianth bristles 4(–5), sometimes rudimentary or absent, brown, slender to stout, much shorter than achene to equaling tubercle; stamens 3; anthers dark yellow to orange-brown, 1.3–2.7 mm; styles 2-fid. Achenes not persistent, yellow maturing to yellow-brown or dark brown, ellipsoid, obovoid, or obpyriform, biconvex to plano-convex, angles obscure, 1.1–1.9 × 0.8–1.5 mm, apex rounded, neck absent or short, smooth at 30X, or finely rugulose at 10–20X with 20 or more horizontal ridges in a vertical series. Tubercles brown to whitish, pyramidal, as high as or sometimes much higher than wide, 0.35–0.7 × 0.25–0.7 mm. 2n = 18, 19, 38. [details]Taxonomic remark Source in seed data: wcs Updated scientificnameAuthorship from Britton to Britton in Small, information provided by Alan E. on email Oct. 12 2020 More details could be found in The Plant List [details]
To Biodiversity Heritage Library (16 publications) (from synonym Eleocharis xyridiformis Fernald & Brackett)
To Biodiversity Heritage Library (6 publications) (from synonym Eleocharis perlonga Fernald & Brackett)
To Biodiversity Heritage Library (89 publications)
To European Nucleotide Archive, ENA (Eleocharis macrostachya)
To European Nucleotide Archive, ENA (Eleocharis xyridiformis) (from synonym Eleocharis xyridiformis Fernald & Brackett)
To GenBank (59 nucleotides; 40 proteins) (from synonym Eleocharis xyridiformis Fernald & Brackett)
To GenBank (63 nucleotides; 39 proteins)
To International Plant Names Index (IPNI)
To International Plant Names Index (IPNI) (from synonym Eleocharis perlonga Fernald & Brackett)
To International Plant Names Index (IPNI) (from synonym Eleocharis xyridiformis Fernald & Brackett)
To IUCN Red List (Least Concern)
To New York Botanical Garden Steere Herbarium (Eleocharis_macrostachya_NY51033_type_1)
To New York Botanical Garden Steere Herbarium (Eleocharis_macrostachya_NY51034_type_1)
To Plants of the World Online (from synonym Eleocharis perlonga Fernald & Brackett)
To Plants of the World Online
To Plants of the World Online (from synonym Eleocharis xyridiformis Fernald & Brackett)
To US Herbarium (Eleocharis xyridiformis US334713 type 1) (from synonym Eleocharis xyridiformis Fernald & Brackett)
To US Herbarium (Eleocharis xyridiformis US818986 type 1) (from synonym Eleocharis xyridiformis Fernald & Brackett)
To Biodiversity Heritage Library (6 publications) (from synonym Eleocharis perlonga Fernald & Brackett)
To Biodiversity Heritage Library (89 publications)
To European Nucleotide Archive, ENA (Eleocharis macrostachya)
To European Nucleotide Archive, ENA (Eleocharis xyridiformis) (from synonym Eleocharis xyridiformis Fernald & Brackett)
To GenBank (59 nucleotides; 40 proteins) (from synonym Eleocharis xyridiformis Fernald & Brackett)
To GenBank (63 nucleotides; 39 proteins)
To International Plant Names Index (IPNI)
To International Plant Names Index (IPNI) (from synonym Eleocharis perlonga Fernald & Brackett)
To International Plant Names Index (IPNI) (from synonym Eleocharis xyridiformis Fernald & Brackett)
To IUCN Red List (Least Concern)
To New York Botanical Garden Steere Herbarium (Eleocharis_macrostachya_NY51033_type_1)
To New York Botanical Garden Steere Herbarium (Eleocharis_macrostachya_NY51034_type_1)
To Plants of the World Online (from synonym Eleocharis perlonga Fernald & Brackett)
To Plants of the World Online
To Plants of the World Online (from synonym Eleocharis xyridiformis Fernald & Brackett)
To US Herbarium (Eleocharis xyridiformis US334713 type 1) (from synonym Eleocharis xyridiformis Fernald & Brackett)
To US Herbarium (Eleocharis xyridiformis US818986 type 1) (from synonym Eleocharis xyridiformis Fernald & Brackett)
