Penstemon haydenii, the blowout penstemon or blowout beardtongue, or is a species of penstemon in the family Plantaginaceae. The warm-season perennial plant is native to nine counties in the Nebraska Sand Hills and a single location in Carbon County, Wyoming. The plant has a milky-blue color with a waxy cuticle, pale purple leaves, and alternating leaf pattern with one central stock. The flowers, while in the inflorescence stage, originate from the bases of the leaves of the plant. Blowout penstemon ...