Geum. While the early dwarf species and cultivars have finished the taller perennial geums are worth looking for.
Chatham Island forget me not. The last of these should be flowering in shady parts of various gardens.
Corydalis. The blue perennial Corydalis are still flowering. These varieties were developed from a rare plant call Corydalis cashmeriana. The yellow annual species Corydalis lutea is now flowering and pinks and white species will be following in December.
Davidia. The last of the pocket handkerchief tree (Davidia involucrata) bracts and flowers may till be seen on this spectacular tree.