The Collaborative International Dictionary of English v.0.48:

Laterifolious \Lat`er*i*fo"li*ous\, a. [L. latus, lateris, side
   + folium leaf: cf. F. lat['e]rifoli['e].] (Bot.)
   Growing from the stem by the side of a leaf; as, a
   laterifolious flower.
   [1913 Webster]