Is this a Carbon? Obtained from last fall's seed exchange

[frdmfrc]

Last fall when Hmacdona organized the seed exchange, we got a packet of seeds labelled carbon and grew several of them this year. After looking at the leaves and other descriptions of Carbon I've found on the internet, I'm not sure this is a carbon. All the seeds that we planted have produced the same plants and here are some pictures of the plants and fruit. Do you think it's a carbon and, if not, any ideas what it might be? Here's a link to Carbon on Tatiana's site http://tatianastomatobase.com/wiki/Carbon