Sedge (family Cyperaceae) is a very diverse family among angiosperms which contains over 100 genera and about 5,500 species. 23 genera could be found in Hong Kong. Previous study (Shaw, 2000) showed that Hong Kong is particularly rich in Cyperaceae among regions nearby which is probably due to rich local habitat diversity.Identification of Cyperaceae is difficult in field whereas floral parts and fruits are tiny. Also, photos are comparatively few on internet or books, which further makes it harder to be identified.
Above shows a locally very common Cyperaceae species, Fimbristylis ovata, which mainly inhabits grasslands and wastelands. There is only one spikelet per inflorescence which makes them relatively easy to identify.
