The record derives from TICA
(data supplied on )
which reports it as a synonym (record
D1A31060-6400-4AE3-A76D-30485680EE37) with original publication details: H. M. Hall in Univ. Calif. Publ. Bot. 3. 1907 278 1907.
Full publication details for this name can be found in IPNI:
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 Troximon heterophyllum in version 1 of The Plant List.