The picture is scanned from pp. 90-122 of the book:

with kind permission of Gian Lupo Osti, Italy. January 2002

italian edition:

Osti, Gian Lupo, 1997, Il Libro delle Peonie , Umberto Allemandi & C. SBN 88-422-0736-5 128 pages · 242 color photos · 31x21 · 152 varities of tree peonies are discribed and illustrated in full color · [italian]

english edition:

Osti, Gian Lupo. 1999, The Book Of Tree Peonies. Umberto Allemandi & C. ISBN 88-422-0750-0. 128 pages · 242 color photos · 31x21 · 152 varities of tree peonies are discribed and illustrated in full color · english