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Yes, it is essentially by colour, ssp vulgaris is a lovely 'primrose yellow' whereas ssp sibthorpii has a huge range from purple, lilac, red, pink to white with only rare yellow. John Richards also gives one or two other minor differences. Ssp vulgaris occurs throughout the whole species range whereas ssp sibthorpii occurs in northern and central Greece through Turkey to the Caucasus. To see some of the range of colours of sibthorpii see Pam Eveleigh's 'Primulaworld' website.
Very nice, Wim.Here:Primula 'Elizabeth Browning'Primula 'Lady Greer'
I love white Primula and your "Aire Waves" is very cute Wim
Mark Primula petiolaris is a good one and others in the same section. They're very ground (trough) hugging with stemless flowers. Also P. clarkei or warshenewskiana. These all need to be cool.