Cyperaceae taxon details
Carex roalsoniana Jim.Mejías & M.Escudero
1676981 (urn:lsid:marinespecies.org:taxname:1676981)
accepted
Species
terrestrial
Jiménez-Mejías, P.; Escudero, M. (2016). Notes on South American Carex section Schiedeanae and description of the new species Carex roalsoniana. Phytotaxa, 260(2): 185-192., available online at https://doi.org/10.11646/phytotaxa.260.2.8
page(s): 186 [details]
page(s): 186 [details]
Holotype NY 02840465, geounit Ecuador
Holotype NY 02840465, geounit Ecuador [details]
Description Perennial; caespitose. Stems 10–52 cm long, 0.8–1.2 mm width in its middle length, shorter than or as long as the...
Taxonomic remark Source in seed data: ipni Update namepublishedIn from Phytotaxa 260(2): 186. 2016 [11 May 2016] [epublished] to Phytotaxa...
Description Perennial; caespitose. Stems 10–52 cm long, 0.8–1.2 mm width in its middle length, shorter than or as long as the leaves, trigonous, with narrowly winged margins, faintly scabrid in most its length, with pickles in both antrorse and retrorse directions; basal sheaths up to 2–2.5 cm high, soft, ± entire, dark brown. Leaves flat or slightly M shaped in cross section, hypostomatic, the uppermost of the flowering stems with a blade 23–54 cm long, the widest with a blade 3–4 mm width; ligule 4–8 mm, longer than wide, acute, hyaline; lowermost leaves reduced, with a short blade and the side opposite to the blade brownish. Inflorescence 1.9–3.6 cm long, with 2–3 androgynous spikes, sometimes one of them reduced, the lowest one ± covered at the base by the lowermost bract; lowermost bract 6–13 cm × 1.7–3.5 mm, much longer than the inflorescence, sheathless; second lowermost bract 2.5–5.4 cm × 0.8–2.2 mm, longer than its spike. Spikes androgynous, densely flowered, with up to 40–50 utricles, being the female part much more developed than the male one; uppermost spike 20–22.5 × 4.5–5 mm, generally larger than the lowermost one, with a male part 1.5–4 mm long; lowermost spike 11.7–20 × 3–4.5 mm, with a male part 1.7–3.5 mm long; cladoprophylls present at the base of each spike, ± 2.2 mm long, utriculiform, hyaline to reddish, with a funnel-shaped beak with ciliate borders, containing a female flower although frequently aborting it, if developing then the achene body protrudes from the cladoprophyll beak. Male glumes 2 × 0.6–0.8 mm, entirely hyaline or with the central nerve green, acute, scabrid above, crowded at the top of the spike. Anthers 0.7–0.8 mm long, filaments 1–1.6 mm long, reddish. Female glumes deciduous, dropping before utricles, with a body 2.5–4 × 0.6–1.4 mm, hyaline, narrowly obovate to oblong, with a central band greenish with 1–3 nerves, acute, mucronate, the ones from the middle part of the spike with the mucro 0.5–1.1 long, sparsely scabrid. Utricle 3.6–4.1 × 1.4–1.6 mm, elliptical, soft, membranaceous, hyaline to straw-colored, nerveless except for the two lateral nerves, attenuated into a 0.5–1.2 mm smooth beak. Stigmas 3, very short, conspicuously convolute backward, reddish-brown and densely papillose; style base bulbous, deciduous, leaving a flattish lignified remnant at the top of the achene. Achene 2.1–2.9 × 1.2 mm, trigonous; rachilla vestigial (~0.1 mm) or absent. [details]
Taxonomic remark Source in seed data: ipni Update namepublishedIn from Phytotaxa 260(2): 186. 2016 [11 May 2016] [epublished] to Phytotaxa...
Taxonomic remark Source in seed data: ipni Update namepublishedIn from Phytotaxa 260(2): 186. 2016 [11 May 2016] [epublished] to Phytotaxa 260: 186 (2016), information provided by Alan E. on email Jun. 07 2021 [details]
Cyperaceae Working Group. (2025). [see How to cite]. Global Cyperaceae Database. Carex roalsoniana Jim.Mejías & M.Escudero. Accessed at: https://www.cyperaceae.org/aphia.php?p=taxdetails&id=1676981 on 2025-09-13
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2024-12-10 11:47:54Z
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Nomenclature
original description
Jiménez-Mejías, P.; Escudero, M. (2016). Notes on South American Carex section Schiedeanae and description of the new species Carex roalsoniana. Phytotaxa, 260(2): 185-192., available online at https://doi.org/10.11646/phytotaxa.260.2.8
page(s): 186 [details]
basis of record Plants of the World Online (POWO). , available online at https://powo.science.kew.org/ [details]
page(s): 186 [details]
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
Holotype NY 02840465, geounit Ecuador [details]
From editor or global species database
Description Perennial; caespitose. Stems 10–52 cm long, 0.8–1.2 mm width in its middle length, shorter than or as long as the leaves, trigonous, with narrowly winged margins, faintly scabrid in most its length, with pickles in both antrorse and retrorse directions; basal sheaths up to 2–2.5 cm high, soft, ± entire, dark brown. Leaves flat or slightly M shaped in cross section, hypostomatic, the uppermost of the flowering stems with a blade 23–54 cm long, the widest with a blade 3–4 mm width; ligule 4–8 mm, longer than wide, acute, hyaline; lowermost leaves reduced, with a short blade and the side opposite to the blade brownish. Inflorescence 1.9–3.6 cm long, with 2–3 androgynous spikes, sometimes one of them reduced, the lowest one ± covered at the base by the lowermost bract; lowermost bract 6–13 cm × 1.7–3.5 mm, much longer than the inflorescence, sheathless; second lowermost bract 2.5–5.4 cm × 0.8–2.2 mm, longer than its spike. Spikes androgynous, densely flowered, with up to 40–50 utricles, being the female part much more developed than the male one; uppermost spike 20–22.5 × 4.5–5 mm, generally larger than the lowermost one, with a male part 1.5–4 mm long; lowermost spike 11.7–20 × 3–4.5 mm, with a male part 1.7–3.5 mm long; cladoprophylls present at the base of each spike, ± 2.2 mm long, utriculiform, hyaline to reddish, with a funnel-shaped beak with ciliate borders, containing a female flower although frequently aborting it, if developing then the achene body protrudes from the cladoprophyll beak. Male glumes 2 × 0.6–0.8 mm, entirely hyaline or with the central nerve green, acute, scabrid above, crowded at the top of the spike. Anthers 0.7–0.8 mm long, filaments 1–1.6 mm long, reddish. Female glumes deciduous, dropping before utricles, with a body 2.5–4 × 0.6–1.4 mm, hyaline, narrowly obovate to oblong, with a central band greenish with 1–3 nerves, acute, mucronate, the ones from the middle part of the spike with the mucro 0.5–1.1 long, sparsely scabrid. Utricle 3.6–4.1 × 1.4–1.6 mm, elliptical, soft, membranaceous, hyaline to straw-colored, nerveless except for the two lateral nerves, attenuated into a 0.5–1.2 mm smooth beak. Stigmas 3, very short, conspicuously convolute backward, reddish-brown and densely papillose; style base bulbous, deciduous, leaving a flattish lignified remnant at the top of the achene. Achene 2.1–2.9 × 1.2 mm, trigonous; rachilla vestigial (~0.1 mm) or absent. [details]Taxonomic remark Source in seed data: ipni Update namepublishedIn from Phytotaxa 260(2): 186. 2016 [11 May 2016] [epublished] to Phytotaxa 260: 186 (2016), information provided by Alan E. on email Jun. 07 2021 [details]
To Biodiversity Heritage Library (1 publication)
To International Plant Names Index (IPNI)
To New York Botanical Garden Steere Herbarium (Carex_roalsoniana_NY2840465_holotype_1)
To Plants of the World Online
To US Herbarium (Carex roalsoniana US2279465 type 1)
To US Herbarium (Carex roalsoniana US2279465 type 2)
To International Plant Names Index (IPNI)
To New York Botanical Garden Steere Herbarium (Carex_roalsoniana_NY2840465_holotype_1)
To Plants of the World Online
To US Herbarium (Carex roalsoniana US2279465 type 1)
To US Herbarium (Carex roalsoniana US2279465 type 2)
From editor or global species database
Hosted externally
Hosted externally
Hosted externally
