Research
The International Daffodil Register and Classified List (1998)
DAFFODIL CLASSIFICATION
5. a) The colours and equivalent code letters which may be used to describe a daffodil cultivar will be those of the flower at maturity, when viewed from the front. They are:
| White or Whitish | W |
| Green | G |
| Yellow | Y |
| Pink | P |
| Orange | O |
| Red | R |
In distinguishing Yellow from Orange in daffodil classification, borderline colours including and on the green side of RHS Yellow-Orange Group 15 on the RHS Colour Chart are said to be Yellow; those including and on the red side of Yellow-Orange Group 16 are Orange.
In distinguishing Orange from Red, borderline colours including and on the yellow side of RHS Orange Group 29 are said to be Orange; those including and on the purple side of Orange-Red Group 30 are Red.
It is at the registrant's discretion to distinguish White from Yellow or Green, Yellow from Green, or Pink from the pale tones of Orange or Red.
b) The colour code will consist of two letters or two groups of letters separated by a hyphen: the letter(s) before the hyphen will describe the perianth segments; the letter(s) following the hyphen will describe the corona. For example: 1 Y-Y, 2 YYW-Y, 3 Y-YYO.
c) For purposes of description the perianth segments are divided into three zones: outer zone, mid-zone and base; and the corona into three zones: base, mid-zone and rim.
d) If the perianth segments are substantially of a single colour, a single code letter will describe them; if they are of more than one colour, three code letters will be used, describing first the outer zone, secondly the mid-zone and lastly the base; or if the colours are non-concentric, describing first the predominant colour, which is followed by an oblique line, then the non-predominant colour. For example: 1 W-Y, 2 YYW-Y, 1 Y/W-W.
e) If the corona is substantially of a single colour, a single code letter will describe it; if it is of more than one colour, three code letters will be used, describing first the base, secondly the mid-zone and lastly the rim; or if the colours are non-concentric, describing first the predominant colour, which is followed by an oblique line, then the non-predominant colour(s) in any order. For example: 2 Y-Y, 3 Y-YYO, 11a W-O/YW.
f) In double daffodils the code letter(s) before the hyphen will describe not only the perianth segments but also any extra petaloid segments, even if they are interspersed with the corona at the centre of the flower; the code letter(s) following the hyphen will describe the corona or the segments of the corona. Multiple letters before or after the hyphen will in doubles as in all other daffodils indicate that there is more than one concentric or non-concentric colour in the perianth and petaloid segments or in the corona or segments of the corona.
Botanical classification
The classification of daffodils distinguished solely by botanical name is summarized under Division 13 in the horticultural classification. It is spelt out in full in the botanical classification.
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