From your edited list of grasses, WW, you left off...

broomcorn Once widely grown in the american midwest, today ninety per cent of the broomcorn crop is imported into the states from Mexico.

yucca YucK! A lesser natural fiber used in brooms primarily to stiffen. Yucca is processed by the shredding of the yucca plant. Almost one hundred per cent of the yucca used by the broom industry is harvested from wild plants from Arizona.

Uh, not to pry, WW, but don't you sweep?