OregonFlora species comparison

rectangular, 5–10 mm, green;

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

rectangular, 7–12 × 5–6 mm (uppermost sheath shorter); same color as stem and continuous with it; except for a terminal black band formed by the inturned persistent bases of the teeth;

teeth earlydeciduous, articulated and campanulate.

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

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

annual, monomorphic; up to 120 cm tall, usually simple, occasionally with a few hollow ascending branches, green;

ribs 16–30, not furrowed; central cavity up to 75% of the stem diameter.

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.

(when present) with a dark base; first internode very short.

pedunculate.

shortly exserted from the terminal sheath or subsessile; blunt.

=216.

=216.