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CommentsUsually, members of the Mustard family have small white or yellow flowers with nectar that is accessible to insects with short mouthparts. Blue Mustard is distinctive in that each flower has narrow pink or purplish pink petals, a tubular calyx, and a small throat. Other members of the Mustard family with pink or purple flowers include Hesperis matronalis (Dame's Rocket), Lunaria annua (Money Plant). However, the flowers of Dame's Rocket and the Money Plant are larger (more than ¾" across) and their petals are more rounded. Another species in the Mustard family with similar flowers is Iodanthus pinnatifidus (Purple Rocket). However, this latter species has light blue-violet flowers, glabrous stems, and broader leaves toward the base of the plant that are pinnately lobed or ovate with serrated margins. The siliques of Purple Rocket lack a beak and they are more straight than the siliques of Blue Mustard.