Erythronium dens-canis
From LSJ
Φίλους ἔχων νόμιζε θησαυροὺς ἔχειν → Tibi si est amicus, esse thesaurum puta → Mit Freunden, glaub es nur, besitzt du einen Schatz
Wikipedia EN
Erythronium dens-canis, the dog's-tooth-violet or dogtooth violet, is a bulbous herbaceous perennial flowering plant in the family Liliaceae, growing to 25 cm (10 in). It is native to central and southern Europe from Portugal to Ukraine. It is the only naturally occurring species of Erythronium in Europe. Despite its common name, it is not closely related to the true violets of genus Viola.