Very peculiar - looks more like a snakeskin to me! How long is it?

Pictured one is 6.5", it's from a medium to medium-large sized pod. I should have placed a ruler next to it. There's a pic in same db that illustrates how it breaks into individual seeds. If I recall correctly it's somewhere in the middle from Song of Joy.

thank you - much bigger than I would have thought. Are they easy to grow from seed?

Seeding themselves outside, they're close to, if not, invasive.