OregonFlora species comparison

rectangular, 5–10 mm, green;

teeth 3–7 mm, persistent with a dark center and pale hyaline margins.

to approximately 3 × 3 mm, green;

teeth 1–2 mm; free, with black, 2-ribbed midstripe and hyaline margins;

base not articulated, not early-deciduous;

distal part often damaged with age.

annual, monomorphic; up to 80 cm tall, deeply grooved, green;

ribs 5–10; central cavity less than 33% of the stem diameter.

persisting over winter; slender and under 2 mm in diameter; simple or occasionally branched near the base; erect to decumbent, 10–30 cm tall, green; central cavity small; up to 33% of the stem diameter;

ribs 4–8; furrow usually absent on the internode, present on the midribs of the sheath and teeth.

in whorls; from the mid-region of the stem, numerous to sparse (rarely absent);

ridges 4–6; first internode shorter than the sheath and not exserted.

pedunculate.

shortly pedunculate.

=216.

=216.