Viper’s Bugloss (Blueweed; Blue Devil; Blue Thistle)
A biennial plant with bristly hairs and usually with single stems. Flowers along upper stalks in one-sided spikes in an unfurling, tight coil; funnel-shaped with uneven lobes to ¾ inch long; pink in bud, blue to ultramarine later, with pink stamens protruding. A form with white flowers occurs rarely. Blooms May-September. Leaves linear-oblong, sessile, extremely white-hairy (as are the stems), giving the plant a silvery appearance.