The Hibicus Canibus is a legal plant and does have a flower that lasts about 24 hours, but the leaves have been mistaken for Canibus Staiva which is the Marijuana Plant which is illegal.
This is a link on the Hibicus Canibus: http://home-and-garden.webshots.com/photo/1079608847039060981PKukIk
I did find a place on ebay that sells the False canibus " FALSE CANNABIS* DATISCA CANNABINA" seeds and it shows the plant:
The plant has cane like stems according to the description and the leaves resemble the marijuana plant.
These seeds would be legal to plant and has yellow flowers and are not Marijuana, but the leaves do resemble Marijuana. You may want to contact the company if you are uncomfortable with those exta seeds and see if they would replace them with something you would feel more comfortable with.
Please let me know if I can further assist you.
Thanks for your answer. I feel better, but I think I will find these seeds a new home anyway. My husband is extremely uncomfortable with them. Maybe I can barter them or something.
I too would feel a bit uncomfortable with those plants. Wise to try to find someone who wants a novelty. Best wishes!