Neutral blue (rather than purplish or greenish), greenish-blue, and intense blues, available in some related "Delphinium" plants — particularly "Delphinium grandiflorum" — do not occur in this genus. "Aconitum" plants that have purplish-blue flowers are often inaccurately referred to as having blue flowers, even though the purple tone dominates. If there are species with true (neutral) blue or greenish-blue flowers they are rare and do not occur in cultivation. Also unlike the genus "Delphinium", there are no bright red nor intense pink "Aconitum" flowers, as none known are pollinated by hummingbirds. There are no orange-flowered varieties nor any that are green. "Aconitum" is typically more intense in color than "Helleborus" but less intense than "Delphinium". There are no blackish flowers in "Aconitum", unlike with "Helleborus".