Jim McM wrote- > Mother's Day the first of the yellow-flowered sorts had only just begun >to open Oddly their are no defined cultivar groups for tree peonies in America, probably because of their rarity in general. China recognizes at least 4 and theres' at least a few more clear divisions. All of your "yellow- flowered sorts" are members of a group generally known as the "American hybrids" or "Lutea Hybrids". All are based on the work of the two American hybridizers, Prof. A.P. Saunders and N Daphnis and originate from crossing primarily Japanese suffruticosa types with the species P. lutea or selections. The single most common is 'High Noon', but Saunders introduced almost 80 (not all of which are "just' yellow) and Daphnis another 40 or so. Just to hang a name on your plants. Jim W. -- Dr. James W. Waddick 8871 NW Brostrom Rd. Kansas City Missouri 64152-2711 USA Ph. 816-746-1949 Zone 5 Record low -23F Summer 100F +