FAMILY GUIDE to GRASSES, SEDGES, RUSHES
Stem almost all hollow, round or sometimes flattened, with joints.
Single seed in each flowering scale. Leaf sheath is open at the back.
Poaceae
Stem solid and mostly triangular but some round or square, no joints. Single
seed in each flowering scale. Leaf sheath is closed at the back.
Cyperaceae.
Stem solid and mostly round. Several seeds in each pouch. Regular flower made up
of 3 outer and 3 inner scales and 1 pouch. No ligule. Leaf sheath is closed at the back.
Juncaceae
