Cyperaceae taxon details
Carex tonsa (Fernald) E.P.Bicknell
1676209 (urn:lsid:marinespecies.org:taxname:1676209)
accepted
Species
Carex rugosperma var. tonsa (Fernald) E.G.Voss · unaccepted
Carex umbellata f. tonsa (Fernald) Kük. · unaccepted
Carex umbellata var. tonsa Fernald · unaccepted
terrestrial
(of Carex umbellata var. tonsa Fernald) Fernald, M. L. (1902). The variation of some boreal Carices. <em>Proceedings of the American Academy of Arts and Sciences.</em> 37: 495-514., available online at https://www.biodiversitylibrary.org/page/4008650
page(s): 507 [details]
page(s): 507 [details]
Description Plants densely to loosely cespitose; rhizomes ascending to erect, brown to reddish brown, 0–10 mm, stout. Culms 4–16...
Taxonomic remark Source in seed data: wcs Updated scientificnameAuthorship from (Fernald) E.P.Bicknell to E.P.Bicknell, information provided...
Description Plants densely to loosely cespitose; rhizomes ascending to erect, brown to reddish brown, 0–10 mm, stout. Culms 4–16 cm, scabrous distally; bases (remnants of old leaves) fibrous. Leaf blades pale to bright green, equaling or exceeding stems, 0.5–4.3 mm wide, herbaceous or coriaceous, glabrous abaxially, strongly scabrous to papillose adaxially. Inflorescences with both staminate and pistillate scales; peduncles of basal pistillate spikes erect, short to elongate, stout to slender; peduncles of staminate spikes 0.8–15 mm; proximal nonbasal bracts scalelike, shorter than inflorescences. Spikes: proximal pistillate spikes 2–3 (basal spikes 1–2); cauline spikes usually overlapping with staminate spikes, with 3–10(–15) perigynia; staminate spikes 4.5–11.3 × 1.1–3 mm. Scales: pistillate scales pale brown to reddish brown, with narrow white margins, ovate, 2.9–4.1 × 1.5–1.9 mm, equaling or exceeding perigynia, apex acute to long-acuminate; staminate scales ovate, 4.2–5.4 × 1.2–2.1 mm, apex obtuse or acute to acuminate. Anthers 1.6–2.9 mm. Perigynia green to pale brown, veinless, ellipsoid, obtusely trigonous in cross section, 3.1–4.7 × 1.1–1.6 mm; beak straight, pale green, occasionally with reddish brown tinge near apex, strongly 2-edged, 0.9–2 mm, smooth or ciliate-serrulate, apical teeth 0.2–0.5 mm. Stigmas 3. Achenes brown, ellipsoid to obovoid, obtusely trigonous in cross section, 1.6–2 × 1.2–1.6 mm. [details]
Taxonomic remark Source in seed data: wcs Updated scientificnameAuthorship from (Fernald) E.P.Bicknell to E.P.Bicknell, information provided...
Taxonomic remark Source in seed data: wcs Updated scientificnameAuthorship from (Fernald) E.P.Bicknell to E.P.Bicknell, information provided by Alan E. on email Oct. 12 2020 More details could be found in The [details]
Cyperaceae Working Group. (2025). [see How to cite]. Global Cyperaceae Database. Carex tonsa (Fernald) E.P.Bicknell. Accessed at: https://www.cyperaceae.org/aphia.php?p=taxdetails&id=1676209 on 2025-09-14
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2024-12-10 11:47:54Z
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Nomenclature
original description
(of Carex umbellata var. tonsa Fernald) Fernald, M. L. (1902). The variation of some boreal Carices. <em>Proceedings of the American Academy of Arts and Sciences.</em> 37: 495-514., available online at https://www.biodiversitylibrary.org/page/4008650
page(s): 507 [details]
basis of record Plants of the World Online (POWO). , available online at https://powo.science.kew.org/ [details]
new combination reference Bicknell, E. P. (1908). The ferns and flowering plants of Nantucket. <em>Bulletin of the Torrey Botanical Club.</em> 35(10): 471-498., available online at https://www.biodiversitylibrary.org/page/12621780#page/582/mode/1up
page(s): 492 [details]
page(s): 507 [details]
basis of record Plants of the World Online (POWO). , available online at https://powo.science.kew.org/ [details]
new combination reference Bicknell, E. P. (1908). The ferns and flowering plants of Nantucket. <em>Bulletin of the Torrey Botanical Club.</em> 35(10): 471-498., available online at https://www.biodiversitylibrary.org/page/12621780#page/582/mode/1up
page(s): 492 [details]
Present Inaccurate Introduced: alien Containing type locality
From editor or global species database
Description Plants densely to loosely cespitose; rhizomes ascending to erect, brown to reddish brown, 0–10 mm, stout. Culms 4–16 cm, scabrous distally; bases (remnants of old leaves) fibrous. Leaf blades pale to bright green, equaling or exceeding stems, 0.5–4.3 mm wide, herbaceous or coriaceous, glabrous abaxially, strongly scabrous to papillose adaxially. Inflorescences with both staminate and pistillate scales; peduncles of basal pistillate spikes erect, short to elongate, stout to slender; peduncles of staminate spikes 0.8–15 mm; proximal nonbasal bracts scalelike, shorter than inflorescences. Spikes: proximal pistillate spikes 2–3 (basal spikes 1–2); cauline spikes usually overlapping with staminate spikes, with 3–10(–15) perigynia; staminate spikes 4.5–11.3 × 1.1–3 mm. Scales: pistillate scales pale brown to reddish brown, with narrow white margins, ovate, 2.9–4.1 × 1.5–1.9 mm, equaling or exceeding perigynia, apex acute to long-acuminate; staminate scales ovate, 4.2–5.4 × 1.2–2.1 mm, apex obtuse or acute to acuminate. Anthers 1.6–2.9 mm. Perigynia green to pale brown, veinless, ellipsoid, obtusely trigonous in cross section, 3.1–4.7 × 1.1–1.6 mm; beak straight, pale green, occasionally with reddish brown tinge near apex, strongly 2-edged, 0.9–2 mm, smooth or ciliate-serrulate, apical teeth 0.2–0.5 mm. Stigmas 3. Achenes brown, ellipsoid to obovoid, obtusely trigonous in cross section, 1.6–2 × 1.2–1.6 mm. [details]Taxonomic remark Source in seed data: wcs Updated scientificnameAuthorship from (Fernald) E.P.Bicknell to E.P.Bicknell, information provided by Alan E. on email Oct. 12 2020 More details could be found in The [details]
To Biodiversity Heritage Library (16 publications) (from synonym Carex umbellata var. tonsa Fernald)
To Biodiversity Heritage Library (61 publications)
To European Nucleotide Archive, ENA (Carex tonsa)
To GenBank (12 nucleotides; 6 proteins)
To International Plant Names Index (IPNI)
To International Plant Names Index (IPNI) (from synonym Carex rugosperma var. tonsa (Fernald) E.G.Voss)
To International Plant Names Index (IPNI) (from synonym Carex umbellata var. tonsa Fernald)
To International Plant Names Index (IPNI) (from synonym Carex umbellata f. tonsa (Fernald) Kük.)
To Plants of the World Online (from synonym Carex umbellata f. tonsa (Fernald) Kük.)
To Plants of the World Online (from synonym Carex umbellata var. tonsa Fernald)
To Plants of the World Online (from synonym Carex rugosperma var. tonsa (Fernald) E.G.Voss)
To Plants of the World Online
To Biodiversity Heritage Library (61 publications)
To European Nucleotide Archive, ENA (Carex tonsa)
To GenBank (12 nucleotides; 6 proteins)
To International Plant Names Index (IPNI)
To International Plant Names Index (IPNI) (from synonym Carex rugosperma var. tonsa (Fernald) E.G.Voss)
To International Plant Names Index (IPNI) (from synonym Carex umbellata var. tonsa Fernald)
To International Plant Names Index (IPNI) (from synonym Carex umbellata f. tonsa (Fernald) Kük.)
To Plants of the World Online (from synonym Carex umbellata f. tonsa (Fernald) Kük.)
To Plants of the World Online (from synonym Carex umbellata var. tonsa Fernald)
To Plants of the World Online (from synonym Carex rugosperma var. tonsa (Fernald) E.G.Voss)
To Plants of the World Online
