Peonies, The Manual of the American Peony Society, edited by James Boyd © 1928 American Peony Society: [Check List of Chinese Peonies in Commerce] Japanese Peonies, page 63

Ya Machina. (Millet.) Maroon.

YA MACHINA (Millet) - Manual check list.

YAMACHINA (Millet) - 1939 check list. Jap - Maroon. Midseason. 1939 check list.

Rivière (1995):

'Ya Machina' /Millet/1939

Carsten Burkhardt's Web Project Paeonia - The Peony Database