Possible Clues:

• Poisonous plant also known as monkshood
• A notice about a poisonous plant
• Sadly, one cat I poison
• Poison, one finds it in an ice cream cornet
• Poisonous plant — it is buried in a geometric shape
• Flower poisonous if a traffic controller swallows it
• Wolfsbane, or the poison derived from it
• A solid figure holding Italian flower
• Poisonous plant of the buttercup family
• A poisonous plant, it comes in a regular shape