Rhynchospora species?- Assam


Cyperus sp. from Assam KD 09 Aug 22:
Attached images are Cyperus sp, from Assam. Please Id of the sp.
Date : 29.08.22
Location: Assam
Family : Cyperaceae
Genus & species : Cyperus ?
Habit :   Herb

This does not appear to be cyperus. Maybe some other genus.

May be. Thank You Sir.

Looks like Rhynchospora corymbosa of Cyperaceae

Does it not look different from Rhynchospora corymbosa as per images at ?:
https://portal.wiktrop.org/species/show/638
http://www.efloras.org/object_page.aspx?object_id=122089&flora_id=2
https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:220271-2
https://www.gbif.org/species/2721495
https://www.researchgate.net/figure/Rhynchospora-corymbosa

Can it be some Actinoscirpus species like Actinoscirpus grossus (L.f.) Goetgh. & D.A.Simpson?

The Rhynchospora images in each of the above links looks different and hence is confusing.

However, it is not Actinoscirpus or any of the Scirpus/ Schoenoplectus group either as this group usually have more apparently lateral or deflected inflorescences while Rhynchospora, Fimbristylis, Cyperus, etc. have inflorescences that is purely terminal and upright. (Rhynchospora was also once placed under Scirpus corymbosus) In case of Rhynchospora, the spikelets proliferate after flowering, meaning, the spikelets keep growing and hence one can see various lengths of spikelets. There is also variation in the amount and position of male and female florets. That’s also the reason why the pictures look different. Also, this species has invaded several wetlands across Asia and has numerous variations.
Yet, I would suggest to get it verified from an expert on Cyperaceae.

A feedback from another post:
Could this be Scirpus sylvaticus the wood clubrush, the pictures are similar.
I am no Cyperus expert, just that the Genus has many Aquatic Cyperus, some of which are even sold in Aquarium trade Cyperus helferi, (seems to be a new craze in Mumbai Aquarium shops) and many like Scirpus mucronatus, use knife like Leaves to puncture water lilies, Schonoplectella articulata are ghost like and  strange.

Another possibility is Woodland Bulrush (Scirpus expansus) photo attached

Both these species do not have distribution in our area as per POWO 1 and POWO 2

 

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