Verb (used with object), : to intersperse flowers among shrubs. ,to intersperse a dull speech with interesting anecdotes.    From Dictionary.com. 

We now entered on what was to be the longest continuous period of trench warfare that it was ever our lot to take part in, for we were destined to remain in the forward area, holding trenches with but short reliefs, for a whole six months, and there was little to break the monotony except one or two changes of trench areas and the interspersal, now and then of raids carried out either by ourselves or the enemy.    From Wordnik.com.  [The Sherwood Foresters in the Great War 1914 - 1919 History of the 1/8th Battalion] Reference

Speaks an interspersal in the day’s work.    From Wordnik.com.  [Loin Cloth] Reference