Possible Clues:

• Flower — name one (anag)
• Sea __
• Small plant with red, purple, or white flowers that are shaped like cups
• Flower sends submariner into an ecstasy
• Invertebrate with a floral eponym
• Delicate creature resides in college -- no men allowed over
• Sea creature — clownfish — seen in an estuary's mouth
• Buttercup family member (note the last 3 letters of this clue's answer + ...)
• Sign erected in an English plant
• Name strange individual in plant