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This species is accepted, and its native range is Bangladesh to Myanmar.
Cyperus pertenuis R., watercolour on paper

[KBu]

Prasad, V.P. & Simpson, D.A. 2012. Kew Bulletin 67: 93. https://doi.org/10.1007/s12225-012-9339-7

Conservation
Data Deficient (DD) (IUCN 2001). The only specimens seen are over 120 years old. Therefore it is impossible to make a judgement on conservation status until more modern material has been located.
Distribution
Bangladesh (Sunderbans), Burma.
Ecology
Mangroves.
Morphology General Habit
Perennial with creeping rhizome, up to 80 cm high
Morphology Leaves
Basal leaves reduced to sheaths; upper ones much less than half the length of the stem, up to 12 cm long, at times bladeless
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 3; anthers linear, c. 1 mm long
Morphology Reproductive morphology Flowers Gynoecium Stigma
Stigmas 2 – 3 mm long
Morphology Reproductive morphology Fruits
Nut (immature) oblong-obovate, c. 1.5 × 0.5 mm.
Morphology Reproductive morphology Inflorescences
Inflorescence simple to compound; primary rays up to 5.5 cm long; secondary rays 1 – 1.5 cm long
Morphology Reproductive morphology Inflorescences Bracts
Involucral bracts 3, shorter than inflorescence, spreading Glumes ⅓ imbricate, ovate, 2 – 2.5 × c. 1.5 mm
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets subterete, 15 – 20 × 1 mm
Morphology Stem
Stems trigonous, 2 – 3.5 mm thick
Note
When describing Cyperus pertenuis, Roxburgh did not assign any specimen as a type. However, Clarke (1884) cited Roxburgh’s Flora Indica illustration t. 1320 for C. pertenuis. This illustration, available at the Royal Botanic Gardens, Kew, is selected as the lectotype of C. pertenuis following Articles 9.2, 9.9 and 9.10 of the ICBN Vienna Code (McNeill et al. 2006).
Type
Type: Roxburgh, Flora Indica t. 1320 (lectotype, selected here).
Vegetative Multiplication Rhizomes
Rhizome covered with fibrous remains of sheaths

Native to:

Bangladesh, Myanmar

Cyperus pertenuis Roxb. appears in other Kew resources:

First published in Fl. Ind. 1: 202 (1820)

Accepted by

  • Govaerts, R. (1999). World Checklist of Seed Plants 3(1, 2a & 2b): 1-1532. MIM, Deurne.
  • Prasad, V.P. & Simpson, D.A. (2012). The status of Cyperus pertenuis and Cyperus scariosus (Cyperaceae) Kew Bulletin 67: 93-96.

Not accepted by

  • Govaerts, R. & Simpson, D.A. (2007). World Checklist of Cyperaceae. Sedges: 1-765. The Board of Trustees of the Royal Botanic Gardens, Kew. [Cited as Cyperus articulatus.]

Literature

Kew Bulletin

  • Brown (1810: 216);
  • Brown, R. (1810). Prodromus Florae Novae Hollandiae et Insulae van-Diemen. H. R. Englemann (J. Cramer) and Wheldon & Wesley, Ltd. Weinheim/Bergstr. New York, Hafner Publishing Co. (Repr. 1960).
  • C. B. Clarke (1909: t. 16, f. 2 – 3);
  • C. corymbosus var. scariosus Kük. (Kükenthal 1935: 83).
  • Clarke, C. B. (1884). On the Indian Species of Cyperus; with remarks on some others that specially illustrate the subdivisions of the genus. J. Linn. Soc. Bot. 21: 159.CrossRefGoogle Scholar
  • Clarke, C. B. (1893). Cyperaceae. In: J. D. Hooker, Flora of British India 6. L. Reeve, London.
  • Clarke, C. B. (1909). Illustrations of Cyperaceae. Williams & Norgate, London.
  • Govaerts, R., Simpson, D. A., Bruhl, J., Egorova, T., Goetghebeur, P. & Wilson, K. (2007). World Checklist of Cyperaceae. Royal Botanic Gardens, Kew.
  • IUCN (2001). IUCN Red List Categories and Criteria, Version 3.1. IUCN Species Survival Commission. IUCN, Gland & Cambridge.
  • Karthikeyan, S., Jain, S. K., Nayar, M. P. & Sanjappa, M. (1989). Florae IndicaeEnumeratio: Monocotyledonae. Botanical Survey of India, Kolkata.
  • Kern (1974: 607);
  • Kern, J. H. (1974). Cyperaceae. In: C. G. G. J. van Steenis (ed.), Fl. Males. Ser. 1, 7(3): 435 – 753. Nordhoff International, Leiden.
  • Kükenthal, G. (1935). Cyperus. In: A. Engler, Das Pflanzenreich IV. 20 (Heft. 101). Verlag von Wilhelm Engelmann, Leipzig.
  • McNeill, J., Barrie, F. R., Burdet, H. M., Demoulin, V., Hawksworth, D. L., Marhold, K., Nicolson, D. H., Prado, J., Silva, P. C., Skog, J. E., Wiersema, J. H. & Turland, N. J. (2006). International Code of Botanical Nomenclature (Vienna Code). Regnum Veg. 146. A. R. G. Gantner Verlag KG, Ruggell, Lichtenstein.
  • Roxburgh (1814: 5, nom. nud.)
  • Roxburgh (1820: 202);
  • Roxburgh, W. (1814). Hortus Bengalensis. Mission Press, Serampore, Calcutta.
  • Roxburgh, W. (1820). Flora Indica 1. Mission Press, Serampore, Calcutta.
  • Wight (1834: 83).
  • Wight, R. (1834). Contributions to the Botany of India. Parbury, Allen, London.

Kew Backbone Distributions

  • Prasad, V.P. & Simpson, D.A. (2012). The status of Cyperus pertenuis and Cyperus scariosus (Cyperaceae) Kew Bulletin 67: 93-96.

Art and Illustrations in Digifolia
Digital Image © Board of Trustees, RBG Kew

Kew Backbone Distributions
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

Kew Bulletin
Kew Bulletin
http://creativecommons.org/licenses/by-nc-sa/3.0

Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0