Tattletale  (McAllister, 1998) 

This gray-violet bitone is covered by a smoky overlay when it opens. In full sun, the overlay burns off then the violet fades to tattletale grey as the flower ages and makes the large black, tongue-shaped signal even more prominent. A clump of flowers of different ages commands attention. A fully fertile halfbred, from Edith Seligmann X (Martha Mia x Moon Dust). For show aficionados, its ASI code is OGB.