Adolf de Haer Sunflowers in blue vase Circa 1920 Oil on canvas Signed lower left: A.D.Haer 22 × 23 3/8 in. Überblick 1998. Von Jankel Adler bis Gert H. Wollheim. Dusseldorf, Galerie Remmert und Barth, 1998, cat. no. 1, ill. on the title Private Collection, Rhineland