This name is a synonym of Helianthus debilis subsp. cucumerifolius (Torr. & A.Gray) Heiser.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 35D97555-9B64-4196-9008-0D2422640D48).
This name record (from TICA) was not included in version 1 of The Plant List. It is possible the same name was included from a different data source, to check this you can search for Helianthus cucumerifolius in version 1 of The Plant List.