Jesse, you're gonna hate me, but that's the wrong flower. At least my interpretation is, Byrne was going for the Peace Lily:
Note that her collar matches the petal, with her head being the 'stamen'. Also, the peace lily represents death.
Okay, okay - your lily looks great. You should know that.
- Le Messor
Spike: (Flaccid? Me?) You are one step away, missy.
Buffy: Giles help. He's gonna scold me.