My family has been passing down seeds from a lemon tree for about 3 generations now, There is some controversy about its origin or species. The lemons look like tangerines and when cut the pulp is very orange but are sour just like lemons. People always think we dye the lemonade. We have asked family members where our family got the original seed from and some say it was from Vera Cruz, Mexico but other family members say it might have came from Hawaii. Regardless it appears to have been from a tropical region. Is there a way a seed or part of a tree can be tested? If so, how much can I expect it to cost and where could I get it done?