THONG LANG (ทองหลาง)

Could someone possibly confirm the correct scientific name for THONG LANG (ทองหลาง)?

Up until now I thought it was Erythrina subumbrans, however some recent sites indicate it as Erythrina fusca.

The following sites (which I consider somewhat reliable) indicate it as ES, however there are quite a few other sites which indicate it as EF:

Thai Biodiversity

http://www.thaibiodiversity.org/Life/LifeDetail.aspx?LifeID=374

MULTILINGUAL MULTISCRIPT PLANT NAME DATABASE (MMPND)

http://www.plantnames.unimelb.edu.au/Sorting/Erythrina.html

BGO Plant Data Base

http://www.qsbg.org/Database/Botanic_Book%20full%20option/Search_detail.asp?Botanic_ID=996

I also have the following variations:

Erythrina variegata:

THONG LANG LAI (ทองหลางลาย)

THONG LANG DANG (ทองหลางด่าง)

Thank you for your help.