Pulmonaria officinalis and Anthocyanins changing colour

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Lungwort,Pulmonaria officinalis, is among the first ones in our garden to flower. At first glance modest five petal flower attracts me with its colour again and again, I just love watching how it changes from pink, red to purple, blue as soon as flower matures and its pH changes.

Anthocyanins are glucosides ofanthocyanidins, the basic chemical structure of which is shown here.

Anthocyanins (also anthocyans; from Greekἀνθός (anthos) = flower + κυανός (kyanos) = blue) are water-soluble vacuolar pigments that may appear red, purple, or blue depending on the pH.from:http://en.wikipedia.org/wiki/Anthocyanin

Pulmonaria officinalis L.

Pulmonaria officinalis L. (Polmonaria maggiore)
Jacob Sturm, Johann Georg Sturm – Deutschlands Flora in Abbildungen (1796). – This image is in the public domain because its copyright has expired.from:http://luirig.altervista.org/flora/taxa/index2.php?scientific-name=pulmonaria+officinalis

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