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 (also anthocyans; from Greek: ἀνθός (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. (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