There are several shrubs called Mock Orange, "Syringa" (Philadelphus lewisii) The Idaho State Shrub, is great for arrows. The pith core is not large and the wood when burnished resembles Ivory in color and texture. It is one of my favorite arrow shafts. Once straightened it hold well long periods of time. This particular Mock Orange works easily in straightening and diameter reduction. Try it, you will like it.