The color allows a quick first identification of a plant whose drawings are clear and sensible. When the confusion between two flower colors is possible (eg red and blue) the plant is included in its 2 colors The Latin names can check also in more specific books Each page includes plants of the same family (between all valuable part) - allowing, when one hesitates, an immediate comparison among plants of the same family. The short comments is sufficient and clear.
An excellent book on excursions that allows rapid determination in light of readily identifiable elements. This application may be a small vocabulary botanistique baggage.