Halophila ovata   Gaudichaud,  1827 (Seagrass)
Organism information awaits expert curation
Taxonomy
Kingdom:Plantae
Phylum:Magnoliophyta
Class: Equisetopsida
Order:Alismatales
Family:Hydrocharitaceae

Image copyrights: Government of India

Description
Plants dioecious. Rhizomes slender, terete, fleshy, unbranched, rarely branched, semi-transparent. Roots solitary, unbranched with soft minute root hairs. Scales 2, the one embracing the base of petioles obovate, oblong-elliptic, truncate to subtruncate at base, retuse at apex, entire along margins, convolute, transparent; the other embracing rhizome obovate, subtruncate at base, retuse at apex, entire along margins, convolute, transparent, with thick white tissue in the middle. Leaves paired at each node, glabrous. Petioles subterete, fleshy, transparent.
Flowers axillary, solitary, subtended by spathes. Male flowers upto 3 cm long. Spathes elliptic-lanceolate, subtruncate at base, hooded or shortly acuminate at apex, entire along margins, convolute, transparent. Pedicels slender, terete, fleshy, semitransparent. Tepals 3, elliptic, subtruncate at base, hooded or obtuse at apex, entire along margins, concave, transparent, pale brown without, white within. Stamens 3, oblong, pale yellow. Filaments minute or sessile. Anthers oblongoid. Connective tissues thick, brown, stand erect even after shedding pollens. Pollen grains oblong, forming a chain, contained in a mucilage sheath, brown.
Female flowers subsessile, subtended by 2 subequal spathes. Spathes lanceolate, subtruncate at base, acuminate at apex, entire along margins, convolute, hyaline. Ovary ellipsoid, white to pale yellow. Styles 3, equal, all inserted at the same point, papillose adaxially, smooth abaxially.
Fruits ovoid to ellipsoid, white to pale yellow. Hypanthium terete, straight or curved, with dilated tip, persistent. Pericarp translucent, scarious. Seeds globose to ellipsoid, bluntly beaked at both ends, white to pale brown, with a few aborted ovules. Testa thin, reticulate, white when young, brown when mature. Embryo globose, white; cotyledon spirally coiled at the anterior side, with a pinkish dot at the centre. Flowering and fruiting throughout the year.


Synonym (s)

Common Name (s)
• Elai Paasi (Tamil)
• Kadal Paasi (Tamil)
• Murungai Paasi (Tamil)
• Neer Pasalai (Tamil)
• Paasi (Tamil)
• Poduthalai Paasi (Tamil)
• Aaku Naasi (Telugu)
• Naasu (Telugu)
• Samuthra Naasu (Telugu)
Economic Importance and Threats

Ecology
Habitat:  Benthic, Estuarine, Sandy, Muddy

Biogeography


• Lakshadweep INDIA
• Gujarat INDIA
• Tamil Nadu, Manoliputti INDIA
• Tamil Nadu, Manoli Island (Lat: 9.2) (Long: 79.11) INDIA (Record: 09/2006)
• Tamil Nadu, Rameswaram INDIA (Record: 13/02/1987, 17/02/1987) (Depth: ±2 mts)
• Tamil Nadu, Mandapam INDIA (Record: 16/02/1987) (Depth: ±1.5 mts)
• Tamil Nadu, Hare Island INDIA (Record: 21/02/1987) (Depth: ±2 mts)
• Tamil Nadu, Cuddalore O.T., Gori INDIA (Record: 19/03/1987) (Depth: ±1.5 mts)
• Tamil Nadu, Pulicat INDIA (Record: 19/05/1987) (Depth: ±3.5 mts)
• Tamil Nadu, Tiruchchendur, Punnakayal INDIA (Record: 17/07/1987) (Depth: ±2 mts)
• Tamil Nadu, Manora INDIA (Record: 17/09/1987) (Depth: ±2 mts)
• Tamil Nadu, Pudukottai, Kattumavadi INDIA (Record: 20/09/1987) (Depth: ±1.5 mts)
• Tamil Nadu, Mimisal INDIA (Record: 22/09/1987) (Depth: ±3 mts)
• Tamil Nadu, Krusadai Island INDIA (Record: 25/09/1987, 21/04/1988) (Depth: ±1 mts)
• Tamil Nadu, Pamban INDIA (Record: 26/09/1987) (Depth: ±1 mts)
• Tamil Nadu, Mandapam, Thonithurai INDIA (Record: 20/04/1988) (Depth: ±2 mts)
• Tamil Nadu, Pamban INDIA (Record: 23/04/1988) (Depth: ±1.5 mts)
• Tamil Nadu, Rameswaram, Ramatheertham INDIA (Record: 24/04/1988) (Depth: ±1.5 mts)
• Tamil Nadu, Rameswaram, Sangumal INDIA (Record: 24/04/1988) (Depth: ±2 mts)
• Andhra Pradesh, Nellore, West Tauvinapatnam INDIA (Record: 07/1883)
• Andhra Pradesh, Prakasam, Pedhapallipalem INDIA (Record: 25/06/1988) (Depth: ±2 mts)
• Andhra Pradesh, Ongole, Salt Pettah INDIA (Record: 27/06/1988) (Depth: ±1 mts)
• Andhra Pradesh, Nellore, Venkateshpuram INDIA (Record: 01/07/1988) (Depth: ±1 mts)
• Andhra Pradesh, Prakasam, Reddypalem INDIA (Record: 02/07/1988) (Depth: ±0.5 mts)
• Tamil Nadu, Chengalpattu, Muttukkadu INDIA (Record: 23/05/1987) (Depth: ±3 mts)
• Tamil Nadu, Chengalpattu, Sathurangapatnam INDIA (Record: 24/05/1987) (Depth: ±3 mts)
• Tamil Nadu, Ramanathapuram, Akkalmadam INDIA (Record: 22/04/1988) (Depth: ±2 mts)
• West Bengal INDIA
• Orissa INDIA
• Andhra Pradesh INDIA
• Tamil Nadu INDIA
• Andaman and Nicobar Islands INDIA
• Tamil Nadu, Off Kattapadu-Tiruchchendur Coast INDIA (Record: 12/1986-03/1987)
• Tamil Nadu, Kattapadu-Tiruchchendur INDIA (Record: 12/1986-03/1987)
• Tamil Nadu, Thonithurai INDIA
• Tamil Nadu, Pamban INDIA
• Tamil Nadu, Manoli Island INDIA
• Tamil Nadu, Gulf of Mannar, Hare Island INDIA
• Tamil Nadu, Gulf of Mannar INDIA
• Palk Bay INDIA
• Andaman and Nicobar Islands, Andamans INDIA
• Lakshadweep, Minicoy INDIA
• Lakshadweep, Suheli INDIA
• Andaman and Nicobar Islands, Katchall INDIA
• Andaman and Nicobar Islands, Nancowry INDIA
• Andaman and Nicobar Islands, Great Nicobar Island INDIA
• Tamil Nadu, Cuddalore INDIA (Record: 01/1987-09/1988)
• Tamil Nadu, Rameswaram INDIA (Record: 01/1987-09/1988)
• Tamil Nadu, Krusadai Island INDIA (Record: 01/1987-09/1988)
• Tamil Nadu, Manappadu INDIA (Record: 01/1987-09/1988)
• Tamil Nadu, Nellai Kattabomman, Nadar Uvari INDIA (Record: 01/1987-09/1988)
• Tamil Nadu, Hare Island INDIA (Record: 01/1987-09/1988)

Literature Source(s)
  • Mathews, G; Diraviyaraj, K and Edward, JKP (2008) Seagrass abundance in Manoli Island of the Gulf of Mannar, southeast of India. Proceedings of the national symposium on marine and coastal ecosystems 27-29, August 2007 Seaweed Research and Utilisation Seaweed Research and Utilisation Association 30 59-65 Available at - NIO, Goa
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at - http://www.marinespecies.org
  • Ramamurthy, K; Balakrishnan, NP; Ravikumar, K and Ganesan, R (1992) Seagrasses of Coromandel Coast India Botanical Survey of India, Coimbatore 80 pp Available at - NIO, Goa
  • Jagtap, TG; Komarpant, DS and Rodrigues, R (2003) The seagrasses of India World atlas of seagrasses University of California Press, Berkeley, USA 101-108 Available at - NIO, Goa
  • Kaliaperumal, N; Chennubhotla, VSK; Kalimuthu, S; Ramalingam, JR and Pillai, SK (1995) Distribution of seaweeds off Kattapadu-Tiruchendur Coast, Tamil Nadu Seaweed Research and Utilisation Seaweed Research and Utilisation Association 17(1-2) 183-193 Available at - NIO, Goa
  • Kaliaperumal, N; Chennubhotla, VSK; Kalimuthu, S; Ramalingam, JR; Pillai, SK; Muniyandi, K; Rao, KR; Rao, PVS; Thomas, PC; Zaidi, SH and Subbaramaiah, K (1998) Seaweed resources and distribution in deep waters from Dhanushkodi to Kanyakumari, Tamilnadu Seaweed Research and Utilisation Seaweed Research and Utilisation Association, Tamil Nadu, India 20(1&2) 141-151 Available at - NIO, Goa
  • (2006) Algaebase Available at - http://www.algaebase.org/
  • Thangaradjou, T and Kannan, L (2005) Marine sediment texture and distribution of seagrasses in the Gulf of Mannar Biosphere Reserve Seaweed Res Utilis NISCAIR 27(1&2) 145 - 154 Available at - http://www.casmbenvis.nic.in/sdnp/coral%20reef%20pdf/C11.pdf
  • Tanaji,G; Jagtap, Deepali,S; Komarpant, and Rodrigues, RS (2003) Status of a seagrass ecosystem:an ecologically sensitive wetland habitat from India Wetlands 23(1) 161–170 Available at - http://www.springerlink.com/content/awjp1469442q5g75/fulltext.pdf
  • Thangaradjou, T; Nobi, EP; Dilipan, E; Sivakumar, K and Sushila, S (2010) Heavy metal enrichment in seagrasses of Andaman Islands and its implications on the health of the coastal ecosystem Indian Journal of Marine Sciences NISCAIR 39(1) 85-91 Available at - http://nopr.niscair.res.in/bitstream/123456789/8550/1/IJMS%2039%281%29%2085-91.pdf
  • Kaliaperumal, N; Kaladharan, P and Kalimuthu, S (1989) Seaweed and seagrass resources Marine living resources of the union territory of Lakshadweep: An indicative survey with suggestions for development Bulletin of Central Marine Research Institute CMFRI 43 162-176 Available at - http://eprints.cmfri.org.in/8213/1/Bulletin_No_43.pdf
  • Jagtap, T.G. (1992) Marine flora of Nicobar group of islands in Andaman Sea. Indian Journal of Marine Sciences National Institute of Science Communication & Information Resources 21(1) 56-58 Available at - NIO,Goa
  • Parthasathy, N; Ravikumar, K; Ganesan, R and Ramamurthy, K (1991) Distribution of seagrasses along the coast of Tamil Nadu, Southern India Aquatic botany Elsevier 40(1) 145-153 Available at - NIO, Goa.

Page last updated on:2011-09-29

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