Baptisia 'Purple Smoke':
This is a natural hybrid of Baptisia australis and B. alba, discovered by Rob Gardner of the N.C. Botanic Garden.
http://hoffienursery.com/index...
This should be grown by method of tissue culture or division in order to retain the hybrid features.
http://www.ag3inc.com/PlantDet...
It is possible that your plant was grown from seed, if the hybrid makes seed, in which case it could have reverted to one of the parents which looks like Baptisia australis. The other option is, you got sent Baptisia australis, it wouldn't be the first time nurseries sent out the incorrect plant. Nice plant anyway!
Baptisia alba has white flowers which are smaller. Because of the possibility of the plant being grown from seed if it was indeed from Purple Smoke, all you can say is you have a Baptisia sp. unless you can confirm from the supplier they actually sent B. australis or another hybrid as the case may be.
More info on Baptisia ..
http://www2.ca.uky.edu/HLA/Dun...
