I hope to post more pictures in a few days, when the iris series is done, but if I wait ’til then these plants will be done blooming, so go looking for them now. Baptisia australis (Fabaceae) is not often see in Maryland. It likes the bedrock terraces in the Potomac Gorge. Be careful of high, fast-moving water and poison ivy. There isn’t much else blooming now, so the color really stands out.
More pics soon.
Elizabeth's Wildflower Blog 
What a beautiful flower! I’ve enjoyed photographing wildflowers for the past few years. I’ve made it my mission this year to identify everything I photograph. Do you have a favorite/preferred book/field guide that you would recommend? I live in Western Maryland. Thanks for any advice you can offer!
There are a few books and websites listed on my “About” page. I would start with Newcomb’s and Peterson’s. Don’t get frustrated if you can’t ID something right away; sometimes those books will only get you to the genus. If you’re on facebook, join the Maryland Native Plant Society Discussion Group. Have fun!
Thanks for the heads-up! B, C or somewhere else?
C, off trail though, on the rocks going into the river. Good luck!