Variety traits

Daylily Ploidy

Hemerocallis L.

The genetic characteristic of a daylily that determines the number of chromosome sets: diploids have 22 chromosomes, tetraploids have 44, and triploid forms, such as Hemerocallis fulva, have 33.

In the reference 5 varieties crop Daylily, where this is mentioned in the description.

Daylilies are categorized into groups based on ploidy, which is a key factor for their breeding. Diploids constitute the basis of natural species, whereas tetraploids are produced artificially. Triploid forms are often characterized by sterility. To determine ploidy, flow cytometry or the indirect method of measuring stomata size, which are noticeably larger in tetraploids, are employed.

Ploidy is critically important for hybridization, as successful seed production is possible mainly between plants with the same number of chromosome sets. Tetraploid cultivars differ morphologically from diploids by a more robust habit: they have larger flowers, thicker petals, wider leaves, and sturdier scapes, which accounts for their high breeding and commercial value.

General information about the subject — on the page Ploidy.

Sources8

Varieties of Daylily mentioned in the description

Selection based on the description text, not on official evaluation: these data are absent from registers. For specific variety details, please refer to its profile.