Bladder sedge

I really should know the sedges by heart, since they're very common wetlands plants and I commonly find myself exploring swamps, bogs, and marshes. Alas, beyond being able to recite the old group identification phrase—"sedges have edges," which refers to their triangular-shaped stems—I'm often at a loss to come up with a Carex species when I find one that I need to ID. Truth be told, sedges are tough, but I once learned the grasses, which were considered equally challenging, so it's high time I worked on this group. This one's as good a starting place as any, since it's pretty distinctive and quite showy. It's a member of the Bladder Sedge group, and it's most likely Carex intumescens, which tells you plenty about its common name. There's a close relative known as Carex grayi, but my wetlands botanist friend Jim Cowen tells me that Gray's Bladder Sedge is pretty rare around these parts, so I'm on relatively firm ground—as firm as it gets with wetlands—in going with C. intumescens. I really, of course, should dissect it. Then, I'd actually learn something... and know for sure.