Comparative images of all genera except Cyperus are given below:
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Carex filicina Nees

 

    


Carex gracilenta Boott ex Boeckeler (E. Himalaya to China (W. & SW. Sichuan, NW. Yunnan): China South-Central, East Himalaya as per POWO)

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Carex ovoidispica O.Yano (N. Pakistan to Nepal: Nepal, Pakistan, West Himalaya as per POWO)

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Fimbristylis squarrosa Vahl (Tropical & Subtropical Old World, Caucasus to Japan: Algeria, Angola, Assam, Bangladesh, Botswana, Burundi, Cameroon, Cape Provinces, Central African Repu, Chad, China North-Central, China South-Central, China Southeast, Congo, East Himalaya, Gabon, India, Iran, Japan, Jawa, Korea, Madagascar, Malawi, Mali, Manchuria, Mauritania, Mozambique, Myanmar, Namibia, Nepal, New South Wales, New Zealand North, Niger, Nigeria, Northern Provinces, Northern Territory, Philippines, Primorye, Queensland, Senegal, Sierra Leone, South Australia, Sudan, Sumatera, Taiwan, Tanzania, Tibet, Transcaucasus, Victoria, West Himalaya, Western Australia, Zambia, Zaïre, Zimbabwe; Introduced into: Argentina Northeast, Bolivia, Brazil North, Cuba, Fiji, Greece, Honduras, Italy, New Jersey, Paraguay, Peru, Uruguay, Venezuela as per POWO)


Fimbristylis thomsonii Boeckeler

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Rhynchospora rubra (Lour.) Makino (Tropical & Subtropical Asia to NW. Pacific: Andaman Is., Assam, Bangladesh, Bismarck Archipelago, Borneo, Cambodia, Caroline Is., China South-Central, China Southeast, East Himalaya, Hainan, India, Japan, Jawa, Korea, Laos, Lesser Sunda Is., Malaya, Maluku, Marianas, Nansei-shoto, Nepal, New Guinea, New South Wales, Northern Territory, Philippines, Queensland, Sri Lanka, Sulawesi, Sumatera, Taiwan, Thailand, Vietnam as per POWO)

  


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After discussions it has been decided to include Cyperaceae and Juncaceae also in Poaceae Week, since these three families are closely related and often confused especially by those not well versed with botany. The important links giving differences between these families are given in links in the original post.
I am repeating them again:
This page should prove helpful
This should be helpful in differentiating the three groups

As already mentioned the duration of the week may be extended depending on the number of uploads received from members. … will take a final decision on that.


Details of genera (clicking on a link of genera will give species as available under them) as available in efi site:
Cyperaceae genera (15):

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Cyperaceae :  A pdf containing illustrations of various cyperaceae members can be downloaded freely at link

Other version of the same document can also be downloaded from – link


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1) if they have triangular stem/culm they are cyperaceae, 2) if they have (flat or) round hollow stem they are usually poaceae; except that some may be juncaceae. The following links have more details –

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Species, genera & family pages of‎‎‎ Cyperaceae are now with images. I request you to pl. go through & point out mistakes, if any. I hope this will aid in identifications in future.
This has been possible mainly due to help in ids by …


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