There is variey of peony called 'Marilla Beauty' that was introduced in 1940 so that is another possibility for the flower name listing. The naming a new plant is usually an honor given to the breeder. Occasionally they combine the names of the parent plants (a fictional example: Sweet Marilla and Snow Beauty), but more often if a plant contains a woman's name it is named after a loved one. This seems more likely to me because I can't find any other peonies with Marilla as part of a name.
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