Variations 
var. erectus
This dwarf form grows to 450mm (1½ft) and has blue flowers.

var. Purdyi
This plant has a prostrate mat-forming habit with blue to light purple flowers and may be known as 'Blue Bedder'.

Cultivars
'Heavenly Blue'
This plant produces very blue flowers.

'True Blue'
This plant forms a more open habit with bright blue flowers.