The Collaborative International Dictionary of English v.0.48:

Juneberry \June"ber`ry\, n. (Bot.)
   (a) The small applelike berry of American trees of genus
       Amelanchier; -- also called service berry.
   (b) The shrub or tree which bears this fruit; -- also called
       shad bush, and shad tree.
       [1913 Webster]