flower id please

[adobo]

I have this volunteer plant growing on on of my softpots. the foliage looks interesting that's why I didn't killed it while its younger. it produce a flower spike the gives of several blooms that falls off in the afternoon.

[img]https://i1124.photobucket.com/albums/l580/undergroundchef/IMG_0914.jpg[/img]

[img]https://i1124.photobucket.com/albums/l580/undergroundchef/IMG_1057.jpg[/img]

thanks in advance