Key to Wisconsin Glyceria

Authors: Robert W. Freckmann, John G. Zaborsky, Emmet J. Judziewicz

• 1a.Spikelets 10–25 mm long, linear, with eight to fifteen florets; ligules 5–15 mm long 2

• 1b.Spikelets 3–12 mm long, lanceolate to ovoid, with two to ten florets; ligules 0.5–6 mm long 4

• 2a.Lemma apex with a strongly developed lobe on one or both sides, entire to crenulate between the lobes; leaf blades 3–12 cm long G. declinata

• 2b.Lemma apex unlobed; leaf blades 9–32 cm long 3

• 3a.Leaf blades 2–5 (–10) mm wide; lemmas glabrous between the nerves; anthers 0.5–1 mm long; fruit 1–1.5 mm long G. borealis

• 3b.Leaf blades 5–10 mm wide; lemmas puberulent; anthers 1–2 mm long; fruit 1.5–2.5 mm long G. septentrionalis

• 4a. Lemmas smooth, the nerves not raised much, the apex acute, distinctly exceeding the bluntly rounded palea; anthers two G. canadensis

• 4b.Lemmas with prominently raised nerves, the apex short-acute, only slightly exceeding the palea; anthers two or three 5

• 5a.Upper glumes 0.5–1.5 mm long; lemmas strongly corrugated; culms slender, less than 4 mm thick G. striata

• 5b.Upper glumes 1.5–4 mm long; lemmas not strongly corrugated; culms 5–10 mm thick 6

• 6a. Lower glumes 1–2.3 mm long; upper glumes 1.5–2.7 mm long; lemmas less than 3 mm long G. grandis

• 6b. Lower glumes 2–3 mm long; upper glumes 3–4 mm long; lemmas more than 3 mm long G. maxima