Cyperaceae taxon details
Rhynchospora austrobahiensis W.W.Thomas
1678371 (urn:lsid:marinespecies.org:taxname:1678371)
accepted
Species
terrestrial
Thomas, W. W. (2020). Two new species of Rhynchospora (Cyperaceae) from Bahia, Brazil, and new combinations in Rhynchospora section Pleurostachys. Brittonia, 72(3): 273-281., available online at https://doi.org/10.1007/s12228-020-09621-0
page(s): 275 [details]
page(s): 275 [details]
Holotype CEPEC
, geounit Bahia
, geounit Bahia
Holotype CEPEC
, geounit Bahia [details]
, geounit Bahia [details]
Description Plants rhizomatous, glabrous, the rhizomes 2.5–6 mm in diameter, congested or with internodes to 2.5 cm long. Culms...
Description Plants rhizomatous, glabrous, the rhizomes 2.5–6 mm in diameter, congested or with internodes to 2.5 cm long. Culms erect to arching, triangular, 48–110 cm long, 2–3mm wide below first cauline leaf. Leaves basal and 1–2cauline (not subtending a synflorescence); basal leaves on each shoot ranging from bladeless sheathes to leaves with blades, the sheaths indistinct, often ferrugineous, usually opened, 5–9cmlong(measuring the hyaline remnant), the blades linear, 33 15c0 ×1.1– cm; leaves on fertile culms linear, the sheaths 3-8 cm long, the summit of the shath usually concave or straight, rarely triangular, with no chartaceous contraligule, the blades 40–100 × 1.2–2.2 cm. Inflorescence a series of 4–6 paniculate synflorescences of approximately the same size, each subtended by a leaf-like bract, the bracts at each more distal node diminishing in size, the basal-most bract with a sheath 17–70 mm long, the summit concave, the blade linear, 27–108 × 1.3–1.8 cm; synflorescences with two to occasionally three orders of branching, with 36–8) secondary branches and comprising 25–35 (–50) spikelets when developing, reducing to (10–)15–25 when mature, the central axis about twice the length of the basal lateral branch; lowest lateral synflorescence with peduncle 4–13 cm long, the central axis 4.4–5.5 cm long, the lowest (longest) lateral axis 1.9–2.6 cm long, the spikelet pedicles 3–9 mm long, never clustered. Mature spikelets in flower obovoid to broadly so and tapering to a narrow base, 2.8–3.5 × 2–2.7 mm, ferrugineous, the glumes distichous, the basal 2–3 glumes much smaller than the more distal ones; largest glumes broadly obovate, 2.3–2.7 × 2.43.4 mm, obscurely carinate, cucullate, minutely mucronate. Achene broadly elliptic to broadly obovoid in outline, deeply ellipsoid to nearly globose, 2–2.3 × 1.8–2.2 mm, the summitstraight to slightly arched, the surface shiny, reddish brown, lightly granular; style base persistent, triangular, 0.6–0.8 × 0.7–1.1 mm. Hypogynous bristles 3–6, 1.3–1.8 mm long, flattened, densely papillose-ciliolate, especially along the margins. [details]
Cyperaceae Working Group. (2025). [see How to cite]. Global Cyperaceae Database. Rhynchospora austrobahiensis W.W.Thomas. Accessed at: https://cyperaceae.org/aphia.php?p=taxdetails&id=1678371 on 2025-09-13
Date
action
by
2024-12-10 11:47:54Z
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db_admin
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Nomenclature
original description
Thomas, W. W. (2020). Two new species of Rhynchospora (Cyperaceae) from Bahia, Brazil, and new combinations in Rhynchospora section Pleurostachys. Brittonia, 72(3): 273-281., available online at https://doi.org/10.1007/s12228-020-09621-0
page(s): 275 [details]
basis of record Plants of the World Online (POWO). , available online at https://powo.science.kew.org/ [details]
page(s): 275 [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 CEPEC
, geounit Bahia [details]
, geounit Bahia [details]
From editor or global species database
Description Plants rhizomatous, glabrous, the rhizomes 2.5–6 mm in diameter, congested or with internodes to 2.5 cm long. Culms erect to arching, triangular, 48–110 cm long, 2–3mm wide below first cauline leaf. Leaves basal and 1–2cauline (not subtending a synflorescence); basal leaves on each shoot ranging from bladeless sheathes to leaves with blades, the sheaths indistinct, often ferrugineous, usually opened, 5–9cmlong(measuring the hyaline remnant), the blades linear, 33 15c0 ×1.1– cm; leaves on fertile culms linear, the sheaths 3-8 cm long, the summit of the shath usually concave or straight, rarely triangular, with no chartaceous contraligule, the blades 40–100 × 1.2–2.2 cm. Inflorescence a series of 4–6 paniculate synflorescences of approximately the same size, each subtended by a leaf-like bract, the bracts at each more distal node diminishing in size, the basal-most bract with a sheath 17–70 mm long, the summit concave, the blade linear, 27–108 × 1.3–1.8 cm; synflorescences with two to occasionally three orders of branching, with 36–8) secondary branches and comprising 25–35 (–50) spikelets when developing, reducing to (10–)15–25 when mature, the central axis about twice the length of the basal lateral branch; lowest lateral synflorescence with peduncle 4–13 cm long, the central axis 4.4–5.5 cm long, the lowest (longest) lateral axis 1.9–2.6 cm long, the spikelet pedicles 3–9 mm long, never clustered. Mature spikelets in flower obovoid to broadly so and tapering to a narrow base, 2.8–3.5 × 2–2.7 mm, ferrugineous, the glumes distichous, the basal 2–3 glumes much smaller than the more distal ones; largest glumes broadly obovate, 2.3–2.7 × 2.43.4 mm, obscurely carinate, cucullate, minutely mucronate. Achene broadly elliptic to broadly obovoid in outline, deeply ellipsoid to nearly globose, 2–2.3 × 1.8–2.2 mm, the summitstraight to slightly arched, the surface shiny, reddish brown, lightly granular; style base persistent, triangular, 0.6–0.8 × 0.7–1.1 mm. Hypogynous bristles 3–6, 1.3–1.8 mm long, flattened, densely papillose-ciliolate, especially along the margins. [details]
