Cyperaceae taxon details
Rhynchospora acanthoma A.C.Araújo & Longhi-Wagner
1678346 (urn:lsid:marinespecies.org:taxname:1678346)
accepted
Species
terrestrial
Araújo, A. C.; Longhi-Wagner, H. M.; Thomas, W. W.; Simpson, D. A. (2008). Taxonomic novelties in Rhynchospora (Cyperaceae) from South America. Kew Bulletin, 63(2): 301-307., available online at https://doi.org/10.1007/s12225-008-9035-9
page(s): 303 [details] Available for editors
[request]
page(s): 303 [details] Available for editors
[request]
Holotype INPA, geounit Pará
Holotype INPA, geounit Pará [details]
Description Perennial, 30– 40 cm tall, caespitose, the base slender, not bulbous. Culms 0.6 mm wide, cylindrical or subcylindrical,...
Taxonomic remark Source in seed data: wcs Update namepublishedIn from Kew Bull. 63(2): 303 (306; fig. 2). 2008 [30 Sep 2008] to Kew Bull. 63:...
Description Perennial, 30– 40 cm tall, caespitose, the base slender, not bulbous. Culms 0.6 mm wide, cylindrical or subcylindrical, glabrous. Leaves usually 5; sheaths 23 cm long, not becoming fibrous when old, glabrous; blades 14– 15 cm × 0.3– 0.6 mm, ½ or ¾ the height of the culms, linear, flat, the margins scabrous. Inflorescences capitate, subtended by 4 involucral bracts; involucral bracts similar to the spikelet glumes, ovate, flat, dark brown, membranous, the margins ciliate; basal bract 13– 15 mm long, the expanded basal portion 6– 7 × 5– 6 mm, obovate to pyriform, the contracted distal portion 7– 8 × 0.3– 0.4 mm, stramineous; second bract 6– 7cm× 0.2– 0.3 mm. Capitulum 7– 10 × 9– 10 mm, turbinate. Spikelets 510, 6– 7 × 1.2– 1.7 mm, linear or linear-lanceolate, comprising 8– 10 glumes, basal 3 glumes empty, followed by a single perfect flower and 4– 6 distal staminate flowers; third basal scale 3– 3.6 × 1.52 mm, ovate-lanceolate, brown, coriaceous, glabrous, the apex acute; scale subtending the perfect flower 44.5 × 2– 2.5 mm, ovate-lanceolate, involute, brown, coriaceous, glabrous; glumes subtending the staminate flowers stramineous or brown, the basal one coriaceous, the others membranous, all glabrous. Perianth bristles 5, 2 mm long, as long as the nutlets, plumose to near the apex, antrorsely scabrous apically. Anthers 2, 3 mm long. Nutlets 1.6 × 1 mm, obovoid, biconvex, stramineous, the surface smooth, spinulose apically, the margins prominent, smooth, straight and not cartilaginous; style base persistent, 0.6 × 0.30.4 mm, pyramidal, not confluent with the nutlet, apex glabrous. [details]
Taxonomic remark Source in seed data: wcs Update namepublishedIn from Kew Bull. 63(2): 303 (306; fig. 2). 2008 [30 Sep 2008] to Kew Bull. 63:...
Taxonomic remark Source in seed data: wcs Update namepublishedIn from Kew Bull. 63(2): 303 (306; fig. 2). 2008 [30 Sep 2008] to Kew Bull. 63: 303 (2008), information provided by Alan E. on email Jun. 07 2021 More details could be found in [details]
Cyperaceae Working Group. (2025). [see How to cite]. Global Cyperaceae Database. Rhynchospora acanthoma A.C.Araújo & Longhi-Wagner. Accessed at: https://cyperaceae.org/aphia.php?p=taxdetails&id=1678346 on 2025-09-14
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2024-12-10 11:47:54Z
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Nomenclature
original description
Araújo, A. C.; Longhi-Wagner, H. M.; Thomas, W. W.; Simpson, D. A. (2008). Taxonomic novelties in Rhynchospora (Cyperaceae) from South America. Kew Bulletin, 63(2): 301-307., available online at https://doi.org/10.1007/s12225-008-9035-9
page(s): 303 [details] Available for editors [request]
basis of record Plants of the World Online (POWO). , available online at https://powo.science.kew.org/ [details]
page(s): 303 [details] Available for editors
[request]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 INPA, geounit Pará [details]
From editor or global species database
Description Perennial, 30– 40 cm tall, caespitose, the base slender, not bulbous. Culms 0.6 mm wide, cylindrical or subcylindrical, glabrous. Leaves usually 5; sheaths 23 cm long, not becoming fibrous when old, glabrous; blades 14– 15 cm × 0.3– 0.6 mm, ½ or ¾ the height of the culms, linear, flat, the margins scabrous. Inflorescences capitate, subtended by 4 involucral bracts; involucral bracts similar to the spikelet glumes, ovate, flat, dark brown, membranous, the margins ciliate; basal bract 13– 15 mm long, the expanded basal portion 6– 7 × 5– 6 mm, obovate to pyriform, the contracted distal portion 7– 8 × 0.3– 0.4 mm, stramineous; second bract 6– 7cm× 0.2– 0.3 mm. Capitulum 7– 10 × 9– 10 mm, turbinate. Spikelets 510, 6– 7 × 1.2– 1.7 mm, linear or linear-lanceolate, comprising 8– 10 glumes, basal 3 glumes empty, followed by a single perfect flower and 4– 6 distal staminate flowers; third basal scale 3– 3.6 × 1.52 mm, ovate-lanceolate, brown, coriaceous, glabrous, the apex acute; scale subtending the perfect flower 44.5 × 2– 2.5 mm, ovate-lanceolate, involute, brown, coriaceous, glabrous; glumes subtending the staminate flowers stramineous or brown, the basal one coriaceous, the others membranous, all glabrous. Perianth bristles 5, 2 mm long, as long as the nutlets, plumose to near the apex, antrorsely scabrous apically. Anthers 2, 3 mm long. Nutlets 1.6 × 1 mm, obovoid, biconvex, stramineous, the surface smooth, spinulose apically, the margins prominent, smooth, straight and not cartilaginous; style base persistent, 0.6 × 0.30.4 mm, pyramidal, not confluent with the nutlet, apex glabrous. [details]Taxonomic remark Source in seed data: wcs Update namepublishedIn from Kew Bull. 63(2): 303 (306; fig. 2). 2008 [30 Sep 2008] to Kew Bull. 63: 303 (2008), information provided by Alan E. on email Jun. 07 2021 More details could be found in [details]
