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Identification appreciated
bertrand-mabel
Posts: 2,697
in Plants
It is a monocot growing amongst our irises in a well drained soil and semi shade.
The 3 double stamens stand out from the flower, 3 staminodes, 
it has 3 larger petals and 3 smaller ones.
it has 3 larger petals and 3 smaller ones.The colour (not evident from the photo) is a lovely blue.
The flowers all open simultaneously on the flower spike.
1
Posts
Libertia sessiliflora has blue flowers...comes from Chile.
http://www.chileflora.com/Florachilena/FloraEnglish/HighResPages/EH0709A.htm
https://www.pacificbulbsociety.org/pbswiki/index.php/Libertia
https://www.crosscommonnursery.co.uk/plants-for-coastal-gardens/libertia-sessiliflora-caerulescens.html