It may be possible to distinguish the two clones when grown side by side if what Stout noticed is true wherever they are grown. That is definitely unknown as the amount of doubling in daylily flowers depends very strongly on where and perhaps how they are grown. Certainly the variegated double should always be Kwanso. Bear in mind that Stout grew the plants in New York and that doubling seems to decrease the further North daylilies are grown.
Stout wrote "Individual super-double flowers, that are fully sterile and which have no stamens and no traces of anther sacs on the petaloids are occasionally present among the numerous flowers of the Flore Pleno clone."
He also showed black and white photos of two flowers, one of each clone. The flower of Flore Pleno had 23 parts in total and the flower of Kwanso had 27 parts in total. However, the Flore Pleno flower had 18 petal-type parts while the Kwanso flower had 13 petal type parts (sepals counted as petal-type parts).
