The International Checklist for Hyacinths and Miscellaneous Bulbs, KAVB,
1991 edition:

Hymenocallis 'Sulphur Queen' - narcissiflora (Jacq.) J.F. Macbr. x
amancaes (Ruiz Lopez & Pavon) Nicholson
Tubergen, 1830; flowers primrose-yellow, 6 per umbel, throat light yellow
with green stripes. (2n=74)
F.C.C.-R.H.S. 1927

Ernest Chabot in his "How to Grow Rare Greenhouse Plants," published in
1952, lists I. carribaea, winter flowering; I. occdentalis,
spring-flowering; I. festalis. He then goes on to mention that "Several
named varieties are also available. Sulphur Queen has light yellow blooms
of rare beauty."

Interesting from an historical perspective, while 'Sulphur Queen' is not
mentioned in John C. Wister's "Bulbs for American Gardens," published in
1930, on page 209ff. in the chapter on tender bulbs he mentions
Hymenocallis . . . includes Ismene and goes on briefly "Some of them,
macrostephana, speciosa, and caribea, are winter blooming, and should be
treated like Crinums. They need a warm temperature and should be rested in
the summer. Other species such as calathina, Harrisiana, Macleana, rotata
and littoralis, require a cooler temperature but still greenhouse and they
bloom in the spring and summer and rest in the winter. A few like lacera
and galvestonensis are hardy in the Southern States and bloom in the
spring." All of which perhaps indicates that this wide range of
Hymenocallis / Ismene were to some extent available.

Judy in New Jersey where the La Nina summer has settled in with sunshine,
high temperatures, and no rain
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