With all sterile florets but in small open clusters.  The semi double florets start out yellowish-green and mature to a pale pastel blue

Gardens found in 28 pre 2000 surveys DA  Kwekerji Planten Tuin Esveld (2001)

Gardens found in the 10 surveyed in 2010: DA    ESV AW

UK  Plant Finder 2012: Not listed.