Cyperaceae taxon details
Costularia itremoensis Larridon
1680457 (urn:lsid:marinespecies.org:taxname:1680457)
accepted
Species
terrestrial
Larridon, I.; Rabarivola, L.; Xanthos, M.; Muasya, A. M. (2019). Revision of the Afro-Madagascan genus <i>Costularia</i> (Schoeneae, Cyperaceae): infrageneric relationships and species delimitation. <em>PeerJ.</em> 7: e6528., available online at https://doi.org/10.7717/peerj.6528
page(s): 22 [details] Available for editors
[request]
page(s): 22 [details] Available for editors
[request]
Holotype P 0318446, geounit Madagascar
Holotype P 0318446, geounit Madagascar [details]
Description Medium-sized to tall perennial herb, up to c. 1.4 m. Culm 17–68 cm × 1.7–3.5 mm. Basal leaves distichous; leaf sheaths...
Distribution Costularia itremoensis is endemic to Madagascar and is found in the highlands of South Central Madagascar, in the...
Description Medium-sized to tall perennial herb, up to c. 1.4 m. Culm 17–68 cm × 1.7–3.5 mm. Basal leaves distichous; leaf sheaths 2–6 cm × 7–11 mm, reddish-brown, sometimes burnt old leaf bases present; 20–70 cm × 2.5–5.5 mm, flat, margins scabrid. Cauline leaves 1–2, margins scabrid, sheaths brownish. Inflorescence a panicle, somewhat contracted when young, but more lax at maturity, 24–68 cm long; inflorescence bracts 6–8, unequal, up to four mm wide, sheating, reddish, margins scabrid. Peduncles longest 5.5–11 cm, unequal, flattened, margins scabrid. Pedicels of the spikelets erect, 2–11 mm, margins scabrid. Spikelets oblanceolate, (4.5–)5.5–10 × 1.2–2.8 mm. Glumes 8–13, distichous, the largest 4–6.5 mm long, dark purple above pale below; lower 6–11 glumes empty, acute, increasing in length; upper 2 glumes fertile, more obtuse. Flowers 2, lower male, upper bisexual. Perianth bristles 6, plumose, long antrorsly ciliate. Stamens 3; anthers 6–6.5 mm, linear. Style trifid, long. Nutlet rounded trigonous, 2.4 × 1.2 mm; beak c. 0.5 mm, pale, ciliate. [details]
Distribution Costularia itremoensis is endemic to Madagascar and is found in the highlands of South Central Madagascar, in the...
Distribution Costularia itremoensis is endemic to Madagascar and is found in the highlands of South Central Madagascar, in the Fianarantsoa province. [details]
Cyperaceae Working Group. (2025). [see How to cite]. Global Cyperaceae Database. Costularia itremoensis Larridon. Accessed at: https://cyperaceae.org/aphia.php?p=taxdetails&id=1680457 on 2025-04-15
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2024-12-10 11:47:54Z
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Nomenclature
original description
Larridon, I.; Rabarivola, L.; Xanthos, M.; Muasya, A. M. (2019). Revision of the Afro-Madagascan genus <i>Costularia</i> (Schoeneae, Cyperaceae): infrageneric relationships and species delimitation. <em>PeerJ.</em> 7: e6528., available online at https://doi.org/10.7717/peerj.6528
page(s): 22 [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): 22 [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 P 0318446, geounit Madagascar [details]
Isotype TAN, geounit Madagascar [details]
Isotype TAN, geounit Madagascar [details]
From editor or global species database
Description Medium-sized to tall perennial herb, up to c. 1.4 m. Culm 17–68 cm × 1.7–3.5 mm. Basal leaves distichous; leaf sheaths 2–6 cm × 7–11 mm, reddish-brown, sometimes burnt old leaf bases present; 20–70 cm × 2.5–5.5 mm, flat, margins scabrid. Cauline leaves 1–2, margins scabrid, sheaths brownish. Inflorescence a panicle, somewhat contracted when young, but more lax at maturity, 24–68 cm long; inflorescence bracts 6–8, unequal, up to four mm wide, sheating, reddish, margins scabrid. Peduncles longest 5.5–11 cm, unequal, flattened, margins scabrid. Pedicels of the spikelets erect, 2–11 mm, margins scabrid. Spikelets oblanceolate, (4.5–)5.5–10 × 1.2–2.8 mm. Glumes 8–13, distichous, the largest 4–6.5 mm long, dark purple above pale below; lower 6–11 glumes empty, acute, increasing in length; upper 2 glumes fertile, more obtuse. Flowers 2, lower male, upper bisexual. Perianth bristles 6, plumose, long antrorsly ciliate. Stamens 3; anthers 6–6.5 mm, linear. Style trifid, long. Nutlet rounded trigonous, 2.4 × 1.2 mm; beak c. 0.5 mm, pale, ciliate. [details]Distribution Costularia itremoensis is endemic to Madagascar and is found in the highlands of South Central Madagascar, in the Fianarantsoa province. [details]
Ecology The habitat in which this species is found consists of bare rocks and/or grassland in the Itremo massif (L. Rabarivola, 2014, personal observation). In Isalo, its habitat is dominated by wooded grassland-bushland mosaic and/or plateau grassland-wooded grassland mosaic between 800 and 1,700 m in elevation.
Flowering/fruiting specimens were collected from July to September, plants collected from January to April were immature. [details]
To European Nucleotide Archive, ENA (Costularia itremoensis)
To GenBank (5 nucleotides; 0 proteins)
To International Plant Names Index (IPNI)
To IUCN Red List (Endangered)
To Muséum National d'Histoire Naturelle, Paris (Costularia itremoensis P03184446 holotype 1)
To Plants of the World Online
To Royal Botanic Gardens, Kew (Costularia itremoensis K000662806 type 1)
To GenBank (5 nucleotides; 0 proteins)
To International Plant Names Index (IPNI)
To IUCN Red List (Endangered)
To Muséum National d'Histoire Naturelle, Paris (Costularia itremoensis P03184446 holotype 1)
To Plants of the World Online
To Royal Botanic Gardens, Kew (Costularia itremoensis K000662806 type 1)
