Perianth and other petaloid segments in many whorls, white or yellowish white, ovate, slightly overlapping; the outer whorls spreading, with margins recurved, fairly regularly arranged; the inner whorls successively shorter, inflexed; the center whorls twisted and more strongly inflexed; corona segments very short, interspersed among the petaloid segments, sulfur yellow.

A description according to Daffodils, narcissus, and how to grow them as a hardy plants for cut… 1907 by Arthur Martin Kirby, when known as ‘Silver Phoenix’ or ‘Sulphur Phoenix’, “One of the best varieties in the double incomparable section. Botanically it is N. Pseudo-Narcissus albus plenus sulphureus but popularly known as ‘Codlins and Cream’. A robust grower, bearing very large double flowers of white, with sulphur colored centers.”

There is a question if ‘Sulphre Kroon’ is a synonym of ‘Sulphur Phoenix’.

'Albus Plenus Sulphureus', 'Codlings and Cream', 'Codlins and Cream', 'Lemon Phoenix'