I'm no taxonomist, so I'll just ask a few questions to clarify your question which is vague and quite optimistic.

• Where did they come from?: live trees, seed bank, soil profiles, anthills archaeological excavation?
• Where did they come from geographically? Africa, Australia, Asia?
• Why are you having difficulty identifying them? Are they quite different to other examples or too similar to separate?
• What species have you ruled out?
• Have you shown these to anyone else who has offered an opinion? What did they suggest?

You might need to provide us with some additional information before anyone can offer a considered opinion.

@ Matthew Wheal

Thank you for your response. Yes, I imported these seeds through a courier company from Australia for research purposes. I used botanical taxonomic sources to confirm the species. Most of them have been confirmed as taxonomically, but I am having difficulty identifying the species to which these seeds belong.

Amal Alhasan

The above seeds probably belongs to some phyllodinous species of Acacia, something like Acacia auriculiformis, Acacia mangium and Acacia melanoxylon.

Thanks!

Thank you very much @ Arvind Singhfor your answer. Yes, I have checked these species , but there is a difference in the shape and size of the Elaiosomes of the seeds.