Rhynchospora corymbosa (Cyperaceae) is a globally distributed species which is reported to be found in tropical and subtropical regions. However it was previously assessed as rare in Hong Kong which can only be found in a few localities. The above individual was found in an undescribed locality which is only holding a few individuals. It mainly inhabits lowland wetland or streamside which is, therefore, very vulnerable to disturbance, channelization, development and pollution. There is indeed quite a lot of wetland-associated species in Hong Kong so it's important to take care of this habitat in order to conserve this diversity.
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