Fen n. : Low land overflowed, or covered wholly or partially with water, but producing sedge, coarse grasses, or other aquatic plants; boggy land; moor; marsh.

Example:
How do you pronounce the following Chinese words: Yuan, Jiao and Fen?

Taxonomy
sedge, free encyclopedia, bog, Fenn, grasses, The Fens, wetland, groundwater, rainwater, mosses, vegetation, tufted sedge, pond sedge, species, stage, common reed, rush, Derivation.

Defination from the web:
... A list of species found in a fen therefore covers a range from those remaining from the earlier stage in the successional development to ...