You are bidding on 5 seeds of Prosopis cineraria. 

It is a beautiful tree that gets unusual mimosa like flowers and unique lacy pinnate green leaves.  This is also in the same family as the famous tree that produces the Mesquite wood that is used for flavoring certain foods.  These beautiful plants are hardy to USDA zone 7b or possibly colder with protection. 

HAPPY GARDENING :)