- A local aggrettion of a species other than the dominant one in an associion brings about a plant society; for example, societies of Ericd etralix, of Scirpus caespitosus, of Molinia coerulea, of Carex irta, of Narthecium ossifra gum, and others may occur within i association of Calluna vulgaris.
- Catananche coerulea: hardy, 2 to 3 ft., blue or white.
- Coerulea, blue and white; A.
- Coerulea, 18 in., is violet-blue; F.
- 1.- -Passiflora Coerulea, showing Leaf with Stipules, Tendril, and detached Flower.