Cyperaceae taxon details
Rhynchospora mesoatlantica A.Eberly & Naczi
1769813 (urn:lsid:marinespecies.org:taxname:1769813)
accepted
Species
terrestrial
Eberly, A. T.; Naczi, R. F. C. (2023). Rhynchospora mesoatlantica (Cyperaceae), an imperiled new species of beaksedge from eastern U.S.A. <em>PhytoKeys.</em> 236: 65-81., available online at https://www.biodiversitylibrary.org/page/64666997#page/1/mode/1up
page(s): 70 [details]
page(s): 70 [details]
Holotype NY 3228129, geounit Delaware
Holotype NY 3228129, geounit Delaware [details]
Description Culm (2-)3-9 dm tall, 0.4-1.2 mm wide at midpoint, erect. Leaves filiform, flexuous; proximal leaf blades 7-25 cm long,...
Description Culm (2-)3-9 dm tall, 0.4-1.2 mm wide at midpoint, erect. Leaves filiform, flexuous; proximal leaf blades 7-25 cm long, 0.2-0.6 timesthe culm height, 0.5-0.8 mm wide, margins involute; cauline leaf blades 9-21 cm long, 0.5-1.5 mm wide, margins involute. Infructescence composed of 1-3 (-4) compound fascicles per culm. Fascicles hemispheric to occasionally turbinate, 1.0-2.0 cm wide, composed of 5-75 spikelets, branches of subfascicle 0.3-0.9 cm long, 0.2-0.3 mm wide; distalmost fascicle bracts 1-3, 2-13 cm long, 1-1.5 mm wide. Spikelets 3.6-4.7 mm long, proximal scales 1.5-—2 mm long, scales from middle of spike 3.0-3.4 mm long, cinnamon brown with darker brown central nerve. Perianth bristles 6, the longest per fruit 2.0-2.4 mm long, 0.8-1.1 times as long as fruit (including tubercle), antrorsely barbellate. Fruit (including the tubercle) 2.1-2.3 mm long, 0.85-0.93 mm wide, bearing persistent perianth bristles; body 1.5-1.7 mm long, obpyriform in outline, sur-
face shiny, smooth, brown or reddish-brown except for whitish and well-demarcated central disk on each face, central disk occupying 0.4—0.8 of fruit width; tubercle with straight or slightly concave margins, 0.56-0.70 mm long, 0.26-0.32 of fruit length, 0.6—0.7 mm wide at base; stipe 0.29-0.38 mm long. [details]
face shiny, smooth, brown or reddish-brown except for whitish and well-demarcated central disk on each face, central disk occupying 0.4—0.8 of fruit width; tubercle with straight or slightly concave margins, 0.56-0.70 mm long, 0.26-0.32 of fruit length, 0.6—0.7 mm wide at base; stipe 0.29-0.38 mm long. [details]
Cyperaceae Working Group. (2025). [see How to cite]. Global Cyperaceae Database. Rhynchospora mesoatlantica A.Eberly & Naczi. Accessed at: https://cyperaceae.org/aphia.php?p=taxdetails&id=1769813 on 2025-09-13
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Nomenclature
original description
Eberly, A. T.; Naczi, R. F. C. (2023). Rhynchospora mesoatlantica (Cyperaceae), an imperiled new species of beaksedge from eastern U.S.A. <em>PhytoKeys.</em> 236: 65-81., available online at https://www.biodiversitylibrary.org/page/64666997#page/1/mode/1up
page(s): 70 [details]
page(s): 70 [details]
Present Inaccurate Introduced: alien Containing type locality
Holotype NY 3228129, geounit Delaware [details]
From editor or global species database
Description Culm (2-)3-9 dm tall, 0.4-1.2 mm wide at midpoint, erect. Leaves filiform, flexuous; proximal leaf blades 7-25 cm long, 0.2-0.6 timesthe culm height, 0.5-0.8 mm wide, margins involute; cauline leaf blades 9-21 cm long, 0.5-1.5 mm wide, margins involute. Infructescence composed of 1-3 (-4) compound fascicles per culm. Fascicles hemispheric to occasionally turbinate, 1.0-2.0 cm wide, composed of 5-75 spikelets, branches of subfascicle 0.3-0.9 cm long, 0.2-0.3 mm wide; distalmost fascicle bracts 1-3, 2-13 cm long, 1-1.5 mm wide. Spikelets 3.6-4.7 mm long, proximal scales 1.5-—2 mm long, scales from middle of spike 3.0-3.4 mm long, cinnamon brown with darker brown central nerve. Perianth bristles 6, the longest per fruit 2.0-2.4 mm long, 0.8-1.1 times as long as fruit (including tubercle), antrorsely barbellate. Fruit (including the tubercle) 2.1-2.3 mm long, 0.85-0.93 mm wide, bearing persistent perianth bristles; body 1.5-1.7 mm long, obpyriform in outline, sur-face shiny, smooth, brown or reddish-brown except for whitish and well-demarcated central disk on each face, central disk occupying 0.4—0.8 of fruit width; tubercle with straight or slightly concave margins, 0.56-0.70 mm long, 0.26-0.32 of fruit length, 0.6—0.7 mm wide at base; stipe 0.29-0.38 mm long. [details]
Original description PhytoKeys 236: 70 (2023) [details]
From editor or global species database
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