Baptisia tinctoria.

Botanical name: 

Baptisia tinctoria R. Br. Leguminosae. Horse-Fly Weed. Wild Indigo.

Northeastern America. Barton says the young shoots of this plant, which resemble asparagus in appearance, have been used in New England as a substitute for asparagus.

Sturtevant's Edible Plants of the World, 1919, was edited by U. P. Hedrick.