Tet: Tetraploid
Dip: Diploid
Ploidy refers to the number of chromosomes a daylily has. The normal number, or the diploid number, has 22 chromosomes where as a tetraploid daylily has 44, double the normal number of chromosomes. The distinction is primarily important to hybridizers, as they need to know ploidy when crossing - diploids can be crossed only with diploids, tetraploids only with tetraploids (although there are exceptions to this rule)..
EV: Evergreen - Foliage is green throughout the year, ie. daylily is a continuous grower
DOR: Dormant - Foliage dies back in winter
SEV: Semi-Evergreen - In between EV and DOR
Foliage is normally classified into the above 3 groups but there is much overlap between the groups. The American Hemerocallis Society further defines the types of foliage to: hard dormant, semi-dormant, semi-evergreen, evergreen, and soft evergreen. What is useful to know is the seasonal changes to foliage when purchasing daylilies.
| EE | Extra Early | First daylilies to bloom in early summer |
| E | Early | Daylilies that bloom 3-5 weeks prior to peak bloom season |
| EM | Early to Mid | Daylilies that bloom 1-3 weeks before peak bloom season |
| M | Mid | Daylilies that bloom at peak bloom time |
| ML | Mid to Late | Daylilies that bloom 1-3 weeks after peak bloom time |
| L | Late | Daylilies that bloom when most others have finished (4-6 weeks after peak) |
| VL | Very Late | Last daylilies to bloom, in autumn |
Scape height: Measured in inches
Bloom size: Measured in inches
Re: Rebloom: Additional scapes come up from a fan that has already bloomed. Rebloom is less dependable in Canada where temperatures may be too low. Bud count becomes a more important factor in terms of blooming periods.
Noc: Nocturnal - Flower opens in the late afternoon or early evening, closing sometime during the following day
Ext: Extended Bloom - Flower opens and remains open for at least 16 hours
Fr: Fragrant
VFr: Very fragrant
UFO or UF : Registered as an unusual form
Dbl: Registered as a double
Poly: Registered as a polytepal. Flower has more than the usual 3 petals, 3 sepals and six stamens.
Emo: Early morning opener