Character

Bromus arizonicus

Bromus berteroanus

Bromus carinatus

Bromus catharticus

lemma callus

blunt to pointed

blunt

blunt to pointed

blunt

lemma awn length and nature

6–15 mm

may be slightly bent,
not twisted

9–20 mm

bent, twisted

4–7 mm

not bent or twisted

1–3(10) mm or awnless

not bent or twisted

lemma teeth length

0.7–2 mm or none

2–3 mm

none

<1 mm or none