OregonFlora species comparison

sheaths keeled and laterally compressed;

blades 4–27 cm × 1.5–5(7.5) mm;

upper surface scabrous or with sparse hairs.

spike-like panicles, 1.5–8(10)cm × 10– 20 mm, with spikelets enclosed in bur-like fascicles of hard, often spine-tipped branches.

2–3(4) per fascicle; (4)5.8–7.8 mm.

lower glumes 0.8–3 mm;

upper glumes 4–6 mm; lower lemmas 4–6.5 mm; upper lemmas 4–7.6 mm.

8.3–11.9 × 3.5–6 mm; more or less globose, pubescent, with 45–75 bristles; the longer bristles 3.5–7 mm.

of lower florets 1.5–2 mm, anthers of upper florets 0.7–1 mm and poorly developed.

=34.