Cymodocea rotundata  

Monopodial rhizome thicker than Cymodocea rotundata with short stems and internodes 2-9 cm long. Leaf sheath obconical, up to 3 cm long, with acute auriculae, 2 mm long. [1]

Inhabit sandy, sandy-muddy to muddy areas and coral   reefs. Usually found in lower intertidal zones. [1]

In Malaysia, can be found in Negeri Sembilan (Cape Rachado, Port Dickson), Melaka (Pulau Serimbun, Pulau Besar, Pulau Lalang), Johor (Pulau Tinggi, Pulau Sibu Tengah, Merambong Shoal), Sabah (Pulau Gaya, Pulau Sipadan, Pulau Mabul, Semporna, Tanjung Kaitan, Nunuyan Laut, Kota Kinabalu), Labuan (Pulau Papan). [1]

A relatively less common species with a cluster of 2-3 dark green leaves attached by a well develop long leaf sheath. Leaf sheath scars form continuous ring around the shoot-annular appearance. The leaf tip is bluntly rounded and sometimes appears slightly heart-shaped to the naked eye. The rhizomes are smooth and clean, devoid of leaf scars between successive shoots. [2]

It is tolerant of a wide range of salinity and may invade estuarine areas. May form pure stand or mixed with species of Halodule. [1]

1. Phang, S.M. (2000). Seagrasses of Malaysia. Botanical   Monographs No. 2. Kuala Lumpur: University of Malaya.
2. Japar, Sidik.B. (2006). Taburan dan Kepentingan Rumput Laut di Malaysia. Universiti Putra Malaysia, Bintulu Sarawak.