Salvia -- by stevetoearth Specifically Summer Jewel. It's a Hummingbird favorite. But still probably not as attractive to them as Wendy's Wish Pink Salvia - shrub size annual- which they go wild for. ~V.
Magenta in the photoshop colour wheel is a secondary colour. This is a good example of Value, the bottom of the flower is white which adds tint to the magenta where as the top of the flower petals is dark and adds shade.