Possible Clues:

• Mean, twisted individual in plant
• One name (anag) — plant
• Sea ___, animal that contracts when touched
• Holding soldiers up in a unit is a bloomer
• Buttercup family plant
• Terribly mean individual in plant
• Sea ___ (jellyfish relative)
• Thimbleweed, for one
• That's a blooming mean one
• Plant with brightly coloured flowers - found also in sea