A French Dandelion cultivar, early and productive with very long leaves!
Probably the same as or an improved form of Large Green Montmagny Dandelion in The Vegetable Garden from 1920 (I haven’t checked the French edition)…still available at http://www.vilmorin-jardin.fr/recherche-produit/legumes/potageres/pissenlit-vert-de-montmagny-ameliore/1-6-789/
Perennial vegetables, Edimentals (plants that are edible and ornamental) and other goings on in The Edible Garden