Simple/Compound
Organization Chart
Broad leaves
Leaves
opposite
Leaves
 compound
Leaves
simple
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.