Season of Bloom:

• EE - Extra Early
• E - Early
• EM - Early Midseason
• M - Midseason
• ML - Late Midseason
• L - Late
• VL - Very Late
• Re - Remontant, or Reblooms

Fragrance:

Fragrance is lacking unless indicated as below:

• FR (FRAG) - Fragrant
• V.FR - Very Fragrant

Blooming:

Day-blooming unless indicated otherwise

• DIU - Day-Blooming
• NOC - Night-Blooming
• EXT - Extended Blooming, flowers remain open 16 hours or more

Foliage Habit:

• EV - Evergreen (continuous growth)
• semi-ev - Semi-Evergreen, or intermediate between the two extremes
• DOR (de) - Dormant (deciduous), discontinues growth, or dormant in winter

Chromosomes:

• DIP - Diploid 
• TET - Tetraploid

Diploid vs. Tetraploid: 

• Flowers tend to be larger.
• Colours of the flower tend to be more intense.
• Scapes tend to be sturdier and stronger.
• Substance of both flower and foliage tend to be heavier.
• Vegetative vigor in leaf, stem, and flower tend to be greater.
• Breeding possibilities tend to be greater because of an increased number of chromosomes

Diploid:

Diploid daylilies continue to charm growers with their exquisite flower form, grace, and colour.

• Good pink daylilies are still more prevalent in the diploid ranks.
• Spider and double daylilies are still more prevalent in the diploid ranks.
• Diploid daylilies are easier to cross than tetraploids.
• Many diploid daylilies have been converted to tetraploids, thus advancing the tetraploid lines.
• There are more diploids than tetraploids.