ombrotrophic
Concise Oxford English Dictionary © 2008 Oxford University Press:
ombrotrophic /ˌɒmbrə(ʊ)ˈtrəʊfɪk, -ˈtrɒfɪk/
▶adjective Ecology (of a bog or its vegetation) dependent on atmospheric moisture for its nutrients.
'ombrotrophic' also found in these Oxford entries:

