aerophyte

from WordNet (r) 3.0 (2006)

aerophyte
    n 1: plant that derives moisture and nutrients from the air and
         rain; usually grows on another plant but not parasitic on
         it [syn: {air plant}, {epiphyte}, {aerophyte}, {epiphytic
         plant}]

from The Collaborative International Dictionary of English v.0.48

Aerophyte \A"["e]r*o*phyte\, n. [A["e]ro- + Gr. fyto`n plant,
   fy`ein to grow: cf. F. a['e]rophyte.] (Bot.)
   A plant growing entirely in the air, and receiving its
   nourishment from it; an air plant or epiphyte.
   [1913 Webster] aeroplane