sphagnum
Concise Oxford English Dictionary © 2008 Oxford University Press:
sphagnum /ˈsfagnəm/
▶noun a plant of a genus that comprises the peat mosses. [Genus Sphagnum.]
– origin C18: mod. L., from Gk sphagnos, denoting a kind of moss.
'sphagnum' also found in these Oxford entries:

