CGAXIS plants collection volume 1 contains 20 high detail models of plants compatible with 3ds max 2008 or higher and many others.

Formats included:
*.fbx without materials and textures
*.obj without materials and textures
*.max (scanline)
*.max (V-Ray) - 3ds max 2008 (or higher) + V-Ray with materials
*.max (Mental ray)
*.c4d (Cinema 4D) with materials and textures