Possible Clues:

• Elusive counter-revolutionary growth
• Elusive flower?
• Low-growing plant
• The Scarlet ..., Sir Percy Blakeney
• Flower of the English aristocracy once sought after in Paris?
• Plant from spot mostly occupied by sea eagle
• Anagallis arvensis or poor man's weather glass
• The Scarlet - (Orczy)
• Bird nesting in spot shortly finds low-growing plant
• Flower worn by a colourful hero?