Nouvelle flore coloriée de poche des Alpes et des Pyrénées. Paris, Klincksieck, 1906-1912. Alps, Plants, Pyrenees, A delicate illustration of Polemonium caeruleum, commonly known as sky-blue polemonium or Greek valerian. The plant features striking purple flowers with five petals, elegantly arranged, and is complemented by elongated green leaves that showcase a finely serrated edge. The composition includes a label detailing the plant's French name, 'Polemoine bleue,' and its classification within the Polemoniaceae family. The overall aesthetic reflects a classic botanical study, highlighting the beauty of this flowering species native to mountainous regions.