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hairy chess, meadow brome

Habit Plants annual, 40–120 cm tall.
Leaves

lower sheaths densely hairy with stiff, often retrorse hairs; upper sheaths pubescent or glabrous;

blades 9–13 cm × 2–4(9)mm, pilose on both surfaces.

Inflorescences

7–16 × 3–6 cm; open; erect to ascending; some branches longer than the spikelets; slender, ascending to spreading.

Spikelets

14– 18(30) mm, oblong-lanceolate; terete to moderately laterally compressed, not purple-tinged, 4–9(13) florets;

floret bases usually concealed at maturity;

rachilla internodes 1.5–2 mm, usually concealed at maturity.

Glumes

glabrous, occasionally scabrous or pubescent;

lower glumes 5–7 mm, 5-veined;

upper glumes 6–9 mm, 7(9)-veined.

Caryopses

equal to or shorter than paleas, weakly to strongly inrolled.

Lemmas

8–11.5 × 1.7–2.6 mm, elliptic to lanceolate; leathery; backs usually glabrous, rounded over the back, distinctly 7(9)-veined;

veins not raised and thickened;

margins scabrous or pubescent, bluntly angled, inrolled or not at maturity;

tips acute to obtuse; bifid;

teeth shorter than 1 mm;

tips awned;

lemma awns 3–10 mm; straight, arising less than 1.5 mm below the lemma tips, awn of the lowest lemma shorter than the others.

Paleas

1–2 mm shorter than lemmas.

Anthers

0.7–2(3)mm.

2n

=14, 28, 56.

Bromus racemosus

Bromus commutatus

Distribution
[WildflowerSearch map]
[BONAP county map]
[WildflowerSearch map]
Discussion

Dry, disturbed areas. 0–1900m. All ecoregions except Est. CA, ID, NV, WA; north to Yukon, east to Newfoundland and GA; Europe and the Baltic region. Exotic.

Bromus commutatus is a common, weedy, annual brome. It is similar to B. racemosus, which has shorter lemmas and longer anthers. It is often confused with B. secalinus, which has paleas subequal to the lemmas and shorter lemmas.

Source Flora of Oregon, volume 1, page 370
Barbara Wilson, Richard Brainerd, Nick Otting
Sibling taxa
B. arenarius, B. briziformis, B. catharticus, B. ciliatus, B. commutatus, B. diandrus, B. hordeaceus, B. inermis, B. japonicus, B. laevipes, B. madritensis, B. orcuttianus, B. pacificus, B. rubens, B. secalinus, B. sitchensis, B. squarrosus, B. sterilis, B. suksdorfii, B. tectorum, B. vulgaris
B. arenarius, B. briziformis, B. catharticus, B. ciliatus, B. diandrus, B. hordeaceus, B. inermis, B. japonicus, B. laevipes, B. madritensis, B. orcuttianus, B. pacificus, B. rubens, B. secalinus, B. sitchensis, B. squarrosus, B. sterilis, B. suksdorfii, B. tectorum, B. vulgaris
Synonyms Bromus commutatus var. apricorum, Bromus commutatus var. commutatus
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