Terrain trees adding 10 draw calls per tree??

Iv been doing some testing and it seems every painted tree i add to my terrain is adding 10 draw calls to my scene. It has only two materials, one for leaves and bark. As far as i know about draw calls is they are per material, so i should have 2 draw calls per tree, right?? could anyone explain where these extra calls are coming from.

oh and i only have one light
also using Deferred Lighting and how does this effect draw calls. i do see a big jump in draw calls when i go from forward lighting to deferred.

Have you looked at how batching effects the final draw calls?