Which trait best distinguishes sedges from grasses?

Which trait best distinguishes sedges from grasses?

• A. Solid triangular stems
• B. Hollow stems with ligules
• C. Net-like leaf veins
• D. Thick blue-green leaves

Answer: (A)

The key idea is the stem shape. Sedges can be distinguished by having solid stems that are triangular in cross-section—often described as “edges.” If you can feel or see a three-sided stem, you’re looking at a sedge. Grasses, by contrast, usually have hollow, round stems with joints, which is a different feel and structure. This difference in stem cross-section is a reliable, quick field cue to separate the two groups, especially since many other features can vary more and aren’t as consistently diagnostic. The other traits—hollow stems with ligules, net-like leaf veins, and thick blue-green leaves—don’t reliably differentiate sedges from grasses, because they can occur in grasses too or aren’t distinctive enough across species.

The key idea is the stem shape. Sedges can be distinguished by having solid stems that are triangular in cross-section—often described as “edges.” If you can feel or see a three-sided stem, you’re looking at a sedge. Grasses, by contrast, usually have hollow, round stems with joints, which is a different feel and structure. This difference in stem cross-section is a reliable, quick field cue to separate the two groups, especially since many other features can vary more and aren’t as consistently diagnostic. The other traits—hollow stems with ligules, net-like leaf veins, and thick blue-green leaves—don’t reliably differentiate sedges from grasses, because they can occur in grasses too or aren’t distinctive enough across species.