Flower pattern of 3 + 3 + 3 'petals' similar to other flowers of the Iris Family. There are only three real petals, the others are sepals of one sort or another.
Some similarities to :
Purple Iris (Iris versicolor), which is also found in Yorkshire on the River Calder (which flows through Hebden Bridge) but has between 2 to 9 flowers per main stem and deeper yellow coloration down the middle of the outer three sepals. Has wider leaf-like spathes half-encircling the top parts of the stems.
Butterfly Iris (Iris spuria) which is also purple with yellow but has 2 to 4 flowes per main stem and is rare in the UK, being confined to ditches in Lincolnshire and Dorset.
Garden Iris aka Bearded Iris (Iris germanica) but that is somewhat branched, has larger flowers (20 - 35mm wide) 3 to 4 flowers per main stem (only 2 - 3 for Siberian Iris) but most prominently a swathe of white stamens with yellow anthers on the upper and narrow parts of the three outer 'petals'.
Like many other Irises, Siberian Iris contains the cardiac poison Iridin.
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