Name means with large sepals

A dwarf plant with four or five white ray florets surrounding white fertile florets.  The ray florets turn red in bright sunlight. Needs some shelter to do well (1m)

Gardens found in the 28 pre 2000 surveyed:   DA LHS WIN TR MS

Gardens found in the 10 surveyed in 2010: DA LHS ESV KAL ABG AW

UKPlant Finder: 2012 = 3 nurseries