Like some aquatic plants

• Standing out above the water
• Standing out of the water
• Rising above the surface
• Rising out of water
• Rising above a surface
• Rising above a water surface

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1680s, formed as if a past-participle adjective, from Latin emersus , past participle of emergere "rise out or up" (see emerge ).

Wiktionary Word definitions in Wiktionary
a. (context botany of an aquatic plant English) That rises above the surface

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Emersed \E*mersed"\, a. [L. emersus, p. p. See Emerge .] (Bot.) Standing out of, or rising above, water. --Gray.