Possible Clues:

• Belladonna lily
• Large-flowered bulb
• That's a blooming stupid sheep a turn of this
• Showy bloom
• That's enough to give a stupid sheep a blooming turn
• Stupid sheep taking a rise out of Milton's sporting shady lady
• Flower seen in a spring month foolish to cut back
• Flower also called a naked lady
• Sport with Lily and a sheep gets to be so silly back there
• Is Lily a different girl when she turns stupid?