Fimbristylis thomsonii

Fimbristylis thomsonii Boeckeler, Linnaea 37: 37 1871. (syn: Iria thomsonii (Boeckeler) Kuntze);

Assam; Bangladesh; China South-Central; China Southeast; East Himalaya; Hainan; Laos; Malaya; Myanmar; Nansei-shoto; Philippines; Sumatera; Taiwan; Thailand; Vietnam as per Catalogue of Life;
 
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https://08511630493324166816.googlegroups.com/attach/107719b15a52dc/_DSC0581.JPG?part=0.1&view=1&vt=ANaJVrEPv4POeHZ6fg1uAL_TE-C9vF6n4V2H9Dz2LrBK1CtAZc_T7ivcWnh_5ppSTsywpI8EJwejay-QPu_ZegbrWYv8NkTg8_lxtp6hd2450yaIMIinKF8


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SK1419 07 Sep 2018 : 8 posts by 4 authors. Attachments (6) - around 600 kb each.
Location: Victoria Peak, Hong Kong 
Date: 12 August 2018
Elevation: 1300 ft.
Habit : Wild
Juncus sp. ??

your guess is on track
This is Juncus, but not easy to confirm the species. 

This should be Fimbristylis thomsonii.
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