Erythrina sykesii Barneby & Krukoff, Lloydia 37: 447 (1974);
Australia; New Zealand(North) as per CoL:



Fabaceae week-flora-Australia:
Erithryna vespertilioa tree.

Flowers fairly similar to Indian Erythrinas

Yes they are, but leaves differ in shape.

Looks different from images of Erythrina vespertilio at Wikipedia  Factsheet  Useful Tropical Plants  Australian Native Plants Society 

Erythrina x sykesii  ??

Difficult to say with the posted images.

Erythrina ×sykesii Barneby & Krukoff

Yes, some possibility as per Lucid Central. Not sure.

Pl. check.