Cyperaceae - Carex diandra Schrank

Description Laxamente cespitosa, aunque en raras ocasiones puede formar un césped algo denso. Tallos 20–60(100) cm, trígonos, con los ángulos agudos, escábridos hacia el ápice. Hojas 1–2(2,5) mm de anchura, de menor longitud que los tallos, planas o canaliculadas, fuertemente ásperas, bastante rígidas; lígula hasta el 1,5 mm, obtusa o truncada; antelígula muy corta o nula; vainas basales enteras, escuamiformes, de color pardo. Bráctea inferior de longitud menor que la inflorescencia, setácea, no envainante. Espigas pequeñas, numerosas, en inflorescencias de 2–3(5) cm, ocasionalmente ramosas en la parte inferior, ± ovoides. Glumas ovales, agudas o mucronadas, de color pardo rojizo, con ancho margen escarioso, las femeninas generalmente menores que los utrículos. Utrículos 2,8–3 × 1,2–1,3 mm, piriformes, plano-convexos, con nervadura apenas perceptible, de color pardo muy oscuro, atenuados en un pico de 1–1,2 mm, algo alado, serrulado, bífido, con una hendidura abaxial. Aquenios 1,3 × 0,8 mm, de contorno oval, biconvexos o plano-convexos, con la base del estilo persistente en forma de una corta columna. 2n = 54*, 58, 60*.
[details]

Description Rhizomes shortly creeping; shoots clustered, forming a loose tussock or appearing at ± regular intervals; roots grey- or...

Description Rhizomes shortly creeping; shoots clustered, forming a loose tussock or appearing at ± regular intervals; roots grey- or orange-brown; scales black or dark grey-brown, persistent. Stems 25–60 cm, slender, ± sharply trigonous, rough on angles. Leaves 20–40 cm × 1–2 mm, rough at least above, ± flat or slightly keeled, gradually tapered to a fine ± trigonous point, grey-green, often overwintering; hypostomous; lower sheaths grey-brown or dark brown, persistent, with inner face hyaline, often with glandular dots; apex ± straight to concave; ligule 1–2 mm, obtuse, tubular with a free margin of 1–2 mm. Inflorescence a ± compact head, 1–5 cm; bracts glumaceous, lowest rarely setaceous. Spikes 6–10, 5–8 mm, sessile, male at top, female below. Male glumes 3–4 mm, lanceolate-elliptic, pale brown-hyaline; apex acute. Female glumes c. 3 mm, broadly ovate, purple-brown, with a short green midrib and broad hyaline margin; apex acute or mucronate. Utricles 3–4 mm, broadly ovoid or suborbicular, plano-convex, distinctly 2–5-ribbed in lower half, dark brown, shiny; beak 1.5–2 mm, broad, serrulate, bifid, split for whole length on abaxial side; stigmas 2; nut top-shaped, plano-convex, stalked. [details]

Description Culms (1–)2–90 cm. Leaves: sheaths adaxially whitish, conspicuously red dotted, truncate or convex at mouth, prolonged...

Description Culms (1–)2–90 cm. Leaves: sheaths adaxially whitish, conspicuously red dotted, truncate or convex at mouth, prolonged 0.4–4(–6) mm beyond base of blade; ligules 8–57 mm; foliage leaf blades 14–30(–47) cm × 1–2.5 mm. Inflorescences bisexual, straight, little interrupted, ± compound (short branch at least on most proximal node or, occasionally, unbranched) , 2–5(–6) × 0.6–1.4(–1.7) cm, proximal 0–3 branches slightly overlapping 1 above; basal branch (when present) with 2–12 spikes; proximal internode 3–7(–10) mm. Pistillate scales straw colored or brownish, 1.5–2.7 × 0.9–1.6 mm, as wide as perigynia at base, narrower distally. Perigynia ± spreading, olive to dark chestnut brown, stongly 4–6-veined and finely 2–4-veined abaxially, with narrow median strip extending full length (grooved aspect emphasized by pair of bordering veins), often membranous flap toward apex, narrowly deltoid-ovoid, unequally biconvex, (2–)2.3–2.5(–2.9) × 1–1.4 mm, shiny; beak 0.9–1.1 mm. Achenes broadly compressed-ovoid, 1.4–1.7 × 0.7–1 mm. 2n = 48, 50, 54, 60. [details]

Taxonomic remark Source in seed data: wcs Update namepublishedIn from Cent. Bot. Anmerk. 57 1781 to Cent. Bot. Anmerk. : 57 (1781),...

Taxonomic remark Source in seed data: wcs Update namepublishedIn from Cent. Bot. Anmerk. 57 1781 to Cent. Bot. Anmerk. : 57 (1781), 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. Carex diandra Schrank. Accessed at: https://cyperaceae.org/aphia.php?p=taxdetails&id=1676826 on 2026-06-08

Taxonomic edit history

Date

action

2023-09-06 07:28:28Z

created

Jiménez-Mejías, Pedro

2024-12-10 11:47:54Z

unchecked

db_admin

2025-03-11 11:19:03Z

changed

Márquez-Corro, José Ignacio

Licensing

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

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Nomenclature

original description (1782). Eien Centurie Botanischer Anmerkungen zu des Ritters von Linne Species Plantarum.
page(s): 49 [details]

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

[request]

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

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Present

Inaccurate

Introduced: alien

Containing type locality

Syntype K 000960381 [details]

From editor or global species database

Additional information 2n=60 [details]

Additional information 2n=54 [details]

Translation Loosely tufted, although in rare cases it may form a somewhat dense turf. Stems 20–60(100) cm, trigonous, with sharp angles, scabrid towards the apex. Leaves 1–2(2.5) mm wide, shorter than the stems, flat or channelled, very rough, rather rigid; ligule up to 1.5 mm, obtuse or truncate; antiligule very short or absent; basal sheaths entire, scale-like, brown. Lowest bract shorter than the inflorescence, setaceous, not sheathing. Spikes small, numerous, in inflorescences 2–3(5) cm long, occasionally branched in the lower part, ± ovoid. Glumes oval, acute or mucronate, reddish-brown, with a broad scarious margin, the female glumes generally shorter than the utricles. Utricles 2.8–3 × 1.2–1.3 mm, pyriform, plano-convex, with venation scarcely visible, very dark brown, attenuated into a 1–1.2 mm beak, somewhat winged, serrulate, bifid, with an abaxial cleft. Achenes 1.3 × 0.8 mm, oval in outline, biconvex or plano-convex, with the style base persistent as a short column. 2n = 54*, 58, 60*. [details]

Definitions

Language	Name
Japanese	クリイロスゲ	[details]

From editor or global species database

To Royal Botanic Gardens, Kew (Carex diandra K000960381 type 1)

Hosted externally

To Royal Botanic Gardens, Kew (Carex diandra K000960383 type 1)

Hosted externally