This has me completely bumfuzzled

This stuff is popping up all over the place this year and I have never seen it before. I've looked in all of my books and can't find anything like it, of course that may be because it's not fully mature yet and the seedhead isn't completely exposed. I am sure it is some sort of native grass, but the seeds it came from must have been dormat for at least fifteen years because I don't ever recall seeing anything that looks like it. It has very tall slender stems, with broad leaves, growing up to a height of about two feet(the leaves that is. The stems are between four and six feet). It is somewhat like Johnsongrass, but the stems are nowhere near as big around.

Anybody got any idee what this is?