For a terrific book about how we can help support wildlife diversity in our backyards, read “Bringing Nature Home: How You Can Sustain Wildlife With Native Plants,” by Douglas Tallamy.
My favorite native plant identification website is Minnesota Wildflowers. It has great photos and detailed information about each plant.
The runner-up is Illinois Wildflowers. Not as many detailed photos as Minnesota Wildflowers above.
For excellent information about the need for pollinator habitat and how you can help with native plantings in your yard, try Xerces Society for Invertibrate Conservation.