The date would be early 2000's. The term deciduous was used because it was from a scientific article and that's the nearest correct term. If you go back to the 1800's early 1900's the precursor of the AHS check lists only used the terms deciduous and evergreen. The inappropriate switch to dormant came in some time later.
If you check out this botanical key to Hemerocallis species in the Flora of China on the Harvard website, for example, they also only use deciduous and evergreen:
http://flora.huh.harvard.edu/c...
Edited to add this from the abstract of the scientific journal the full experiment was described in: "The fungus seems to alternate regularly between daylilies and patrinias in Japan because most daylily species are deciduous...."
From:
http://link.springer.com/artic...
