Trees with opposite leaves can be remembered by the acronym MADCAPHorse.  The letters stand for names of trees with opposite arranged leaves: Maple, Ash, Dogwood, Caprifoliaceae (family that includes honeysuckle and viburnum), Horsechestnut.  But it leaves out Lilac.
	Compound leaf (left) – made up of individual leaflets.
	Simple leaf (right) – new bud arises at base of leaf stem (petiole), not at base of leaflets.