Cyperaceae - Cyperus eragrostis Lam.

Description Rhizomes short, thick. Stems 20–60 cm × 1.2–2.5 mm, triquetrous, smooth. Leaves shorter than to exceeding inflorescence; blade linear, 10–45 cm × 5–10 mm, flattish, acuminate; sheath 2–15 cm long, pale brown to reddish; ligule absent. Inflorescence 3–11 × 9–16 cm, compound and umbel-like; primary branches 8–11, 2–12 cm long; secondary branches 0–3, 0.5–1 cm long; branches terminated by dense clusters of few to numerous spikelets; involucral bracts 5–11, 13–47 cm long, leaf-like, all exceeding inflorescence. Spikelets 5–13 × 1–3 mm, narrowly lanceoloid, flattened; axis not winged. Glumes 2–3 × 1–1.5 mm, distichously arranged, 10–30 per spikelet, ovate-lanceolate to lanceolate, acute to subacuminate, indistinctly 1–3-nerved, pale yellowish- to greenish-brown with membranous sides and pale green keel. Flowers bisexual; perianth bristles 0; stamen 1; anthers 1.2 mm long, with prominent connective; stigmas 3. Nuts 1–1.5 × 0.5–0.6 mm, narrowly obovoid to obovoid, trigonous, minutely punctate, pale to dark greyish-brown. [details]

Description Herbácea, perenne; rizoma de entrenudos ± largos. Tallos hasta de 80 cm, generalmente solitarios, rectos, trígonos. Hojas...

Description Herbácea, perenne; rizoma de entrenudos ± largos. Tallos hasta de 80 cm, generalmente solitarios, rectos, trígonos. Hojas (18)29-44(55) × (0,4)0,5-7,5(10) cm, generalmente de menor longitud que el tallo, la mayoría basales, que dejan desnudo el tallo en parte de su longitud, planas o canaliculadas, antroso-escábridas en los márgenes y el nervio medio, eliguladas; vaina de color pardo claro, con los bordes membranáceos, hialinos. Inflorescencia terminal, en antela compuesta, en su conjunto ± hemisférica, con los radios primarios de 0,3-13 cm, los secundarios rematados por numerosas espiguillas (hasta 90), dispuestas en fascículos; brácteas 4-8, la inferior de (12)17-33(44) × 0,3-0,7(1) cm, sobrepasa ampliamente la inflorescencia; espiguillas (5,3)7-15(41,8) × 2-4,5 mm, estrechamente lanceoladas, comprimidas, con 7-11(32-43) flores; raquidio recto, áptero. Glumas (1,8)2-2,3(5) × (0,5)1-1,5(1,6) mm, dísticas, patentes, separadas entre sí, de lanceoladas a ovado-lanceoladas, agudas o ligeramente acuminadas, de color pajizo o amarillento, con una banda verdosa con 3 nervios. Estambres 1, exerto en la antesis. Estilo largo, con 3 estigmas exertos. Aquenios (0,9)1-1,2(1,3) × 0,4-0,6 mm, de longitud claramente menor (c. 1/2) que la gluma, obovoides, trígonos, finamente punteados, de color pardo oscuro o negruzco en la madurez. [details]

Description Tufted perennial, with very short rhizome. Culms trigonous, smooth, 25–90 cm high, 2–4 mm diam. Leaves slightly...

Description Tufted perennial, with very short rhizome. Culms trigonous, smooth, 25–90 cm high, 2–4 mm diam. Leaves slightly septate-nodulose, as long as culms or shorter, 4–8 mm wide. Inflorescence simple to decompound with up to 12 primary branches to 12 cm long; digitate clusters 10–50 mm diam.; involucral bracts leaf-like, 5–9 exceeding inflorescence. Spikelets flattened, numerous per cluster, to 30-flowered, 5–15 mm long, c. 3 mm wide; rachilla not winged, persistent. Glumes with 3-nerved midrib, 2–2.5 mm long, surface conspicuously isodiametric-reticulate, greenish to white or straw-coloured, tinged yellowish or red-brown. Stamen 1. Style 3-fid. Nut triquetrous, obovoid, about half as long as glume, 1–1.4 mm long, c. 0.5 mm diam., dark brown to greyish. [details]

Description Perennials, rhizomatous. Culms caespitose, (25-)40-60(-90) cm tall, 3-angled to terete, smooth. Leaf blade (10-)25-50 cm ×...

Description Perennials, rhizomatous. Culms caespitose, (25-)40-60(-90) cm tall, 3-angled to terete, smooth. Leaf blade (10-)25-50 cm × 5-8(-12) mm, flat or V-shaped. Involucral bracts 4-8, horizontal to ascending at 15-30°. Inflorescence an anthela, flat or sometimes V-shaped, 3-30(-50) cm × 1.5-8(-12) mm; rays (0-)3-10, 2.5-5(-12) cm; raylets usually absent. Globose head of (20-)30-50(-70) spikelets at apex of each ray, (1-)2-4 cm in diam. Spikelets oblong, 0.5-2 cm × 2.2-3 mm, compressed. Glumes (12-)20-30(-50), whitish to golden brown, ovate-deltoid, 2-2.3 × 1-1.4 mm, basally 2-keeled, laterally veinless. Stamen 1; anther 1-1.2 mm. Style 1-1.2 mm; stigmas 3, ca. 0.5 mm. Nutlet black to dark brown, with a ca. 0.1 mm stipe, broadly ellipsoid, 1.2-1.4 mm, 3-sided, puncticulate, apex apiculate with a 0.2-0.3 mm beak. Fl. and fr. Jul-Aug. 2n = 42. [details]

Taxonomic remark Source in seed data: wcs Update namepublishedIn from Tabl. Encycl. i. 196. 1791 to Tabl. Encycl. 1: 146 (1791),...

Taxonomic remark Source in seed data: wcs Update namepublishedIn from Tabl. Encycl. i. 196. 1791 to Tabl. Encycl. 1: 146 (1791), information provided by Alan E. on email Jun. 07 2021 More details could be found in [details]

Taxonomic citation

Cyperaceae Working Group. (2025). [see How to cite]. Global Cyperaceae Database. Cyperus eragrostis Lam.. Accessed at: https://cyperaceae.org/aphia.php?p=taxdetails&id=1680769 on 2026-08-29

Taxonomic edit history

Date

action

2023-09-06 07:35:01Z

created

Larridon, Isabel

2024-12-10 11:47:54Z

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Licensing

The webpage text is licensed under a Creative Commons Attribution 4.0 License

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Nomenclature

basis of record Plants of the World Online (POWO). , available online at https://powo.science.kew.org/ [details]

Taxonomy

taxonomy source Jermy, A.C.; Simpson, D.A.; Foley, M.J.Y.; Porter, M.S. (2007). Sedges of the British Isles. 554 pp. Botanical Society of Britain & Ireland, United Kingdom. [details] Available for editors

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taxonomy source Luceño, M., Castroviejo, S., Jiménez-Mejías, P. (2008). Cyperaceae. In: Castroviejo, Luceño, M., Galán, A., Jiménez-Mejías, P., Cabezas, F., Medina, L. (eds). Flora iberica. Plantas vasculares de la Península Ibérica e Islas Baleares. Vol. XVIII. Madrid: CSIC., available online at https://bibdigital.rjb.csic.es/records/item/12958-flora-iberica-vol-18-cyperaceae-pontederiaceae?offset=, http://www.floraiberica.es/PHP/familias_lista_.php?familia=Cyperaceae [details]

Other

additional source Li, B. Z.; Zhang, S. R. (2024). An updated species checklist and taxonomic synopsis of Cyperaceae in China. <em>Biodiversity Science.</em> 32(7): 24106., available online at https://doi.org/10.17520/biods.2024106 [details] Available for editors

[request]

Present

Inaccurate

Introduced: alien

Containing type locality

From editor or global species database

Translation Perennial herb; rhizome with ± long internodes. Culms up to 80 cm tall, generally solitary, erect, trigonous. Leaves (18)29–44(55) × (0.4)0.5–7.5(10) cm, generally shorter than the culm, mostly basal, leaving part of the culm exposed, flat or channelled, antrorsely scabrid on the margins and midrib, eligulate; sheaths light brown, with membranous, hyaline margins. Inflorescence terminal, in a compound anthela, overall ± hemispherical, with primary rays 0.3–13 cm long, the secondary rays terminating in numerous spikelets (up to 90), arranged in fascicles; bracts 4–8, the lowest (12)17–33(44) × 0.3–0.7(1) cm, greatly exceeding the inflorescence; spikelets (5.3)7–15(41.8) × 2–4.5 mm, narrowly lanceolate, compressed, with 7–11(32–43) flowers; rachilla straight, wingless. Glumes (1.8)2–2.3(5) × (0.5)1–1.5(1.6) mm, distichous, spreading, separated from one another, lanceolate to ovate-lanceolate, acute or slightly acuminate, straw-coloured to yellowish, with a greenish band bearing 3 nerves. Stamens 1, exserted at anthesis. Style long, with 3 exserted stigmas. Achenes (0.9)1–1.2(1.3) × 0.4–0.6 mm, distinctly shorter (c. half as long) as the glume, obovoid, trigonous, finely punctate, dark brown to blackish at maturity. [details]

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