Cyperaceae taxon details
Carex opaca (F.J.Herm.) P.Rothr. & Reznicek
1676653 (urn:lsid:marinespecies.org:taxname:1676653)
accepted
Species
Carex bicknellii var. opaca F.J.Herm. · unaccepted
terrestrial
(of Carex bicknellii var. opaca F.J.Herm.) Hermann, F. J. (1972). A new variety of Carex bicknellii from Arkansas. Sida, Contributions to Botany, 5(1): 1-49.
page(s): 49 [details]
page(s): 49 [details]
Holotype (of Carex bicknellii var. opaca F.J.Herm.) US...
Holotype (of Carex bicknellii var. opaca F.J.Herm.) US 00087157, geounit Arkansas [details]
Description Plants densely cespitose, to 200 culms together; rhizomes appearing elongate only in old clumps. Culms 50–115 cm;...
Taxonomic remark Source in seed data: wcs Update namepublishedIn from Novon 11(2): 223. 2001 to Novon 11: 223 (2001), information provided...
Description Plants densely cespitose, to 200 culms together; rhizomes appearing elongate only in old clumps. Culms 50–115 cm; vegetative culms few, inconspicuous, usually fewer than 12 leaves, not strikingly 3-ranked. Leaves: sheaths glabrous, hyaline sometimes brown tinged band near collar, the summits U-shaped to truncate, ± equaling the base of the blade; distal ligules 1.5–5.4 mm; blades 3–6 per fertile culm, 3.5–40 cm × 1.5–4.6 mm. Inflorescences open, erect to slightly arching, pale or golden brown, 2.4–5.5(–6.4) cm × 6.5–21 mm; proximal internode 4–13(–18) mm; 2d internode 3–11 mm; proximal bracts scalelike, with bristle tips to 1.5 cm. Spikes 4–8(–10), distinct, ovoid, 10–22 × 4–11 mm, base rounded to tapered, apex rounded to acute. Pistillate scales pale brown with narrow yellow-green to brown midstripe, lanceolate to narrowly ovate, (3.6–)3.9–5 mm, 2.4–3.1(–3.4) times as long as wide, barely or not reaching base of perigynium beaks, margin hyaline, apex firm and herbaceous, flat or inrolled, obtuse to acute. Staminate scales obtuse to acuminate. Anthers (1.8–)2.2–3.6 mm. Perigynia 15–80 in larger spikes, ± appressed, yellowish green to brown with paler margins, conspicuously 3–7-veined adaxially, 8–12-veined abaxially, 2–5 veins in wings, broadly ovate, broadly elliptic, or orbiculate, often strongly concave, (5.6–)6–7.1 × 3.3–4.6(–4.8) mm, 0.5–0.7 mm thick, margin flat, including wing 0.6–1.3 mm wide, smooth; beak pale or golden brown at tip, strongly flattened, (1.2–)1.5–2.1(–2.3) mm, serrulate-margined to apex, abaxial suture yellow-green to copper-brown, distance from tip of beak to achene 2.8–4 mm. Achenes broadly ovate to oblong, 1.8–2.4 × 1.3–1.9 mm, 0.5–0.7 mm thick, apiculum to 0.5–1.1 mm. 2n = 66, 68. [details]
Taxonomic remark Source in seed data: wcs Update namepublishedIn from Novon 11(2): 223. 2001 to Novon 11: 223 (2001), information provided...
Taxonomic remark Source in seed data: wcs Update namepublishedIn from Novon 11(2): 223. 2001 to Novon 11: 223 (2001), information provided by Alan E. on email Jun. 07 2021 More details could be found in The P [details]
Cyperaceae Working Group. (2025). [see How to cite]. Global Cyperaceae Database. Carex opaca (F.J.Herm.) P.Rothr. & Reznicek. Accessed at: https://cyperaceae.org/aphia.php?p=taxdetails&id=1676653 on 2025-09-13
Date
action
by
2024-12-10 11:47:54Z
unchecked
db_admin
The webpage text is licensed under a Creative Commons
Attribution 4.0 License
Nomenclature
original description
(of Carex bicknellii var. opaca F.J.Herm.) Hermann, F. J. (1972). A new variety of Carex bicknellii from Arkansas. Sida, Contributions to Botany, 5(1): 1-49.
page(s): 49 [details]
basis of record Plants of the World Online (POWO). , available online at https://powo.science.kew.org/ [details]
new combination reference Rothrock, P. E.; Reznicek, A. A. (2001). The taxonomy of the <i>Carex bicknellii</i> group (Cyperaceae) and new species for Central North America. <em>Novon.</em> 11(2): 205-228., available online at https://doi.org/10.2307/3393060
page(s): 223 [details]
page(s): 49 [details]
basis of record Plants of the World Online (POWO). , available online at https://powo.science.kew.org/ [details]
new combination reference Rothrock, P. E.; Reznicek, A. A. (2001). The taxonomy of the <i>Carex bicknellii</i> group (Cyperaceae) and new species for Central North America. <em>Novon.</em> 11(2): 205-228., available online at https://doi.org/10.2307/3393060
page(s): 223 [details]
Present Inaccurate Introduced: alien Containing type locality
Holotype (of Carex bicknellii var. opaca F.J.Herm.) US 00087157, geounit Arkansas [details]
From editor or global species database
Description Plants densely cespitose, to 200 culms together; rhizomes appearing elongate only in old clumps. Culms 50–115 cm; vegetative culms few, inconspicuous, usually fewer than 12 leaves, not strikingly 3-ranked. Leaves: sheaths glabrous, hyaline sometimes brown tinged band near collar, the summits U-shaped to truncate, ± equaling the base of the blade; distal ligules 1.5–5.4 mm; blades 3–6 per fertile culm, 3.5–40 cm × 1.5–4.6 mm. Inflorescences open, erect to slightly arching, pale or golden brown, 2.4–5.5(–6.4) cm × 6.5–21 mm; proximal internode 4–13(–18) mm; 2d internode 3–11 mm; proximal bracts scalelike, with bristle tips to 1.5 cm. Spikes 4–8(–10), distinct, ovoid, 10–22 × 4–11 mm, base rounded to tapered, apex rounded to acute. Pistillate scales pale brown with narrow yellow-green to brown midstripe, lanceolate to narrowly ovate, (3.6–)3.9–5 mm, 2.4–3.1(–3.4) times as long as wide, barely or not reaching base of perigynium beaks, margin hyaline, apex firm and herbaceous, flat or inrolled, obtuse to acute. Staminate scales obtuse to acuminate. Anthers (1.8–)2.2–3.6 mm. Perigynia 15–80 in larger spikes, ± appressed, yellowish green to brown with paler margins, conspicuously 3–7-veined adaxially, 8–12-veined abaxially, 2–5 veins in wings, broadly ovate, broadly elliptic, or orbiculate, often strongly concave, (5.6–)6–7.1 × 3.3–4.6(–4.8) mm, 0.5–0.7 mm thick, margin flat, including wing 0.6–1.3 mm wide, smooth; beak pale or golden brown at tip, strongly flattened, (1.2–)1.5–2.1(–2.3) mm, serrulate-margined to apex, abaxial suture yellow-green to copper-brown, distance from tip of beak to achene 2.8–4 mm. Achenes broadly ovate to oblong, 1.8–2.4 × 1.3–1.9 mm, 0.5–0.7 mm thick, apiculum to 0.5–1.1 mm. 2n = 66, 68. [details]Taxonomic remark Source in seed data: wcs Update namepublishedIn from Novon 11(2): 223. 2001 to Novon 11: 223 (2001), information provided by Alan E. on email Jun. 07 2021 More details could be found in The P [details]
To Biodiversity Heritage Library (10 publications)
To Biodiversity Heritage Library (2 publications) (from synonym Carex bicknellii var. opaca F.J.Herm.)
To European Nucleotide Archive, ENA (Carex opaca)
To GenBank (6 nucleotides; 0 proteins)
To International Plant Names Index (IPNI)
To International Plant Names Index (IPNI) (from synonym Carex bicknellii var. opaca F.J.Herm.)
To Plants of the World Online (from synonym Carex bicknellii var. opaca F.J.Herm.)
To Plants of the World Online
To US Herbarium (Carex bicknellii opaca US2630802 type 1) (from synonym Carex bicknellii var. opaca F.J.Herm.)
To Biodiversity Heritage Library (2 publications) (from synonym Carex bicknellii var. opaca F.J.Herm.)
To European Nucleotide Archive, ENA (Carex opaca)
To GenBank (6 nucleotides; 0 proteins)
To International Plant Names Index (IPNI)
To International Plant Names Index (IPNI) (from synonym Carex bicknellii var. opaca F.J.Herm.)
To Plants of the World Online (from synonym Carex bicknellii var. opaca F.J.Herm.)
To Plants of the World Online
To US Herbarium (Carex bicknellii opaca US2630802 type 1) (from synonym Carex bicknellii var. opaca F.J.Herm.)
From editor or global species database
Hosted externally, from synonym
