air plant

from The Century Dictionary.

• noun A plant unconnected with the ground and apparently living on air: applied to epiphytes, but usually not to parasites. Many epiphytic orchids in cultivation are popularly so named.

from the GNU version of the Collaborative International Dictionary of English.

• (Bot.) A plant deriving its sustenance from the air alone; an aërophyte.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun epiphyte

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun plant that derives moisture and nutrients from the air and rain; usually grows on another plant but not parasitic on it