Bromus arenarius

Labill.
Common names: Australian brome
Introduced
Treatment appears in FNA Volume 24. Treatment on page 235.
Please click on the illustration for a higher resolution version.
Illustrator: Cindy Roché

Copyright: Utah State University

Plants annual. Culms 20-40 cm, erect to ascending. Sheaths densely retorsely pilose; ligules 1.5-2.5 mm, glabrous or pilose, obtuse, lacerate; blades 7-8 cm long, 3-6 mm wide, pilose on both surfaces. Panicles (4) 10-15 cm long, 4-7 cm wide, open, nodding; branches sometimes longer than the spikelets, spreading or ascending, sinuous. Spikelets 10-20 mm, lanceolate, terete to moderately laterally compressed; florets 5-9 (11), bases concealed at maturity; rachilla internodes concealed at maturity. Glumes densely pilose; lower glumes 7-10 mm, 3-veined; upper glumes 8-12 mm, (5) 7-veined; lemmas 9-11 (13) mm long, 1-1.8 mm wide, lanceolate, densely pilose, distinctly 7-veined, rounded over the midvein, margins rounded, not inrolled at maturity, apices acute, bifid, teeth shorter than 1 mm; awns 10-16 mm, straight to weakly spreading, arising 1.5 mm or more below the lemma apices; anthers 0.7-1 mm. Caryopses equaling or shorter than the paleas, thin, weakly inrolled. 2n = unknown.

Distribution

Pa., Calif., Ariz., Oreg., Nev.

Discussion

Bromus arenarius grows in dry, often sandy slopes, fields, and waste places. Native to Australia, it is now widely scattered throughout California, and is also recorded from Oregon, eastern Nevada, Arizona, New Mexico, Texas, and Pennsylvania.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Bromus arenarius"
membranous +  and scarious +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
Leon E. Pavlickf +
Labill. +
divaricate +
3 (?) +  and 0 (?) +
straight +
distinct +
arising +  and spreading +
subterminal +  and terminal +
geniculate +
1.5 cm15 mm <br />0.015 m <br /> (1 cm10 mm <br />0.01 m <br />) +
keeled +  and rounded +
pseudopetiolate +  and branching +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
7 cm70 mm <br />0.07 m <br /> (8 cm80 mm <br />0.08 m <br />) +
not evident +
cross +, linear +  and narrowly lanceolate +
3mm;6mm +
sometimes longer +
ascending;spreading +
spikelike +
Australian brome +
not branching +
erect +  and ascending +
20 cm200 mm <br />0.2 m <br /> (40 cm400 mm <br />0.4 m <br />) +
not woody +
Pa. +, Calif. +, Ariz. +, Oreg. +  and Nev. +
liquid +, soft +  and hard +
capillary +
pistillate +  and staminate +
sometimes longer +
5 +  and 9 +
terete +  and laterally compressed +
1-9(11)-veined +
always shorter +  and usually shorter +
lanceolate +
subtending +
mucronate +  and acute +
unequal +
uncinate +
solid +  and hollow +
0.9 cm9 mm <br />0.009 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
rounded +  and lanceolate +
herbaceous +  and coriaceous +
1mm +  and 1.8mm +
pilose +  and glabrous +
lacerate +  and obtuse +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
membranous +
inconspicuous +
lanceolate +
fleshy +  and membranous +
0.7 cm7 mm <br />0.007 m <br /> (1 cm10 mm <br />0.01 m <br />) +
concealed +  and prominent +
2 +  and 1 +
hairy +  and glabrous +
well-developed +
reduced +
10cm +  and 15cm +
4 cm40 mm <br />0.04 m <br /> (7 cm70 mm <br />0.07 m <br />) +
dry +  and fleshy +
converging +  and parallel +
Introduced +
1 +  and 60 +
not viviparous +
terete +  and moderately laterally compressed +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
1 (?) +  and 3 (?) +
simple +  and compound +
2 (?) +  and 3 (?) +
Gramineae +
Bromus arenarius +
Bromus sect. Bromus +
species +
membranous +
1 cm10 mm <br />0.01 m <br /> (?) +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
aquatic +  and terrestrial +