Cyperus paniceus

 

Flora of Eastern Karnataka, Volume 2  By N. P. Singh (1988- Keys- Mariscus squarrosus (syn. of Cyperus squarrosus L.), Mariscus dubius (syn. of Cyperus dubius Rottb.), Mariscus bulbosus (syn. of Cyperus clarkei T.Cooke), Mariscus paniceus (syn. of Cyperus paniceus (Rottb.) Boeckeler), Mariscus sumatrensis (syn. of Cyperus cyperoides subsp. cyperoides ))

 
 Images by Surajit Koley(inserted by Bhagyashri Ranade)
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Culms to 30 cm tall, smooth. Leaves 20-30 x 0.3-0.4 cm, glabrous. Umbel simple; spikes 3-6, each 1-1.5 x 0.6-0.8 cm, sessile. Spikelets 3-4 x 0.5-0.6 mm terete; glumes 4; lower two glumes smaller; third glumes 3 x 1.5 mm, lanceolate; fourth glumes 3.5 x 0.5 mm. Stamens 2. Nut 2.5 mm long, oblong acute, brown.
Flowering and fruiting: August-September
Degraded forest areas, wastelands and roadsides
Indo-Malesia
 

Cyperus paniceus is distributed in Australia, Myanmar, Bhutan, Sri Lanka, Bangladesh, Nepal, Pakistan and Thailand. In India it is reported from Arunachal Pradesh, Assam, Gujarat, Himachal Pradesh, Kerala, Karnataka, Maharasthra, Rajesthan, Sikkim, West Bengal (Cook 1996). In Uttar Pradesh (Endemic to Himalayas) (Mukarji et al. 2000), In Tamil Nadu (Chengalpattu, Coimbatore, Nilgiri, Madurai, North Arcot, Thiruchirapalli and Tirunelveli) (Henry et al.1987). In Madhya Pradesh (Mandla) (Singh et al. 2001). In Kerala it found in Kottayam, Palaghat, Quilon, Thiruvananthapuram. In Andra Pradesh it ocuurs in Chittoor, East Godavari, and Karimnagar (BSI, Coimbatore).
It grows in seasonally flooded places, marshes and roadsides (Cook 1996) and also in open grasslands (Henry et al. 1987).

  
 
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Hooghly : seems to be Cyperus paniceus (Rottb.) Boeckeler : Attachments (13). 3 posts by 2 authors.
A blog on various cyperus that i often take help - http://vietnamplants.blogspot.in/2013/01/ho-lac-ho-coi-cyperaceae-phan-1.html.
Both the Cyperus cyperoides (L.) O. Kuntze and Cyperus paniceus (Rottb.) Boeckeler can be found in Central Bengal, while the first one can be seen in Assam (Bengal Plants & FBI).
I think this is Cyperus paniceus (Rottb.) Boeckeler.
 
 
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sk2015sept17/17 - Cyperus WHAT?5 posts by 2 authors. Attachments (11)
Photographed today (26-Sept-2015) in Hooghly.
Cyperus cyperoides and allied species are often confusing, very difficult to identify. I think it can be treated as Cyperus cyperoides rather than var. roxburghianus (C.B. Clarke) Kuk. of C. paniceus
With full respect to ..., I beg to differ. Though C. cyperoides (L.) Kuntze can have a single floret in a spikelet, the 3rd glume would have 3 conspicuous green veins (ref. FoC), the same can be seen in Clarke's illustration (no.6). Else there would be more than one floret and thereby nuts. In my species only middle nerve of the glume is green and conspicuous (as can be seen in the illustration no.2).
So, I would rather go with C. paniceus (Rottb.) Boeckeler. 
 

 
 

References:

The Plant List  Annotated checklist of the flowering plants of Nepal (Mariscus paniceus (Rottb.) Vahl) India Biodiversity Portal  IUCN Red List (LC)

Flora of Eastern Karnataka, Volume 2  By N. P. Singh (1988- Keys- Mariscus squarrosus (syn. of Cyperus squarrosus L.), Mariscus dubius (syn. of Cyperus dubius Rottb.), Mariscus bulbosus (syn. of Cyperus clarkei T.Cooke), Mariscus paniceus (syn. of Cyperus paniceus (Rottb.) Boeckeler), Mariscus sumatrensis (syn. of Cyperus cyperoides subsp. cyperoides ))

 

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