Did you get these from the ICPS? Thats were i got mine, and they are COMPLETELY different! My I. lutea are the ones making 16" claws, not P. louisianica! They are making measly little 1"-6" ones! And in both species, the seeds have a hard outer black shell. The white seed you have is on the inside...very very interesting. Great looking plant btw, and nice little help tool!
Hey obregon, I did not get my seed from the ICPS. I got them from Evin (allegedhuman). Are you 100% sure they got the labeling correct? I have read minor accounts and records online that people have labeled Ibicella lutea as Proboscidea lutea and vice versa, which is completely wrong. In addition, when I was doing lots of reading back when I began growing these, some sites would say the the two genera are synonymous! Talk about confusion!
Ibicella almost always produces smaller claws than Proboscidea under natural and ideal growing conditions. The seed pods of Ibicella are hefty, round, and "hairy" while the seed pods of Proboscidea are long, stretched, oval-shaped, and fairly smooth. See the attached picture I got from sarracenia.com to compare the claws. The one on the left is Ibicella and the one of the right is Proboscidea.
The white seed variety of Proboscidea is domesticated (AKA var. hohokamiana). It was selected and developed by O'odham Indians for claw length and ease of germination in order to use the fibers of the claws in basket/craft weaving. Other Proboscidea species and varieties have black seed, and according to Larry, contain germination inhibitors. Thus, making them more difficult to germinate. Your P. louisianica and I. lutea should be growing black seed.
Hope this helps a bit.