Apera spica-venti

Common names: Common windgrass Loose silkybent
Introduced
Treatment appears in FNA Volume 24. Treatment on page 789.

Culms 20-80 (120) cm, stout, usually with several shoots, sparingly branched; internodes shorter or longer than the sheaths. Sheaths often purplish; ligules 3-6 (12) mm; blades usually 6-16 (25) cm long, 2-5 (10) mm wide, flat. Panicles (5) 10-35 cm long, (2) 3-15 cm wide, usually open, pyramidal; branches spreading, naked at the base for 5+ mm, with spikelets usually borne towards the distal ends; pedicels 1-3 mm. Spikelets 2.4-3.2 mm, often purplish; rachillas prolonged for about 0.5 mm. Lower glumes 1.5-2.5 mm; upper glumes 2.4-3.2 mm; lemmas 1.6-3 mm, folded, scabridulous above midlength, awned, awns 5-12 mm; anthers 1-2 mm, greenish to yellowish, often purple-tinged. Caryopses 1-1.5 mm. 2n = 14.

Discussion

Apera spica-venti grows as a weed in lawns, waste places, grain fields, sandy ground, and roadsides. Introduced from Europe, it is found in scattered locations in the Flora region.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Apera spica-venti"
membranous +  and scarious +
purple-tinged +, greenish +  and yellowish +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
awned +  and entire +
Kelly W. Allred +
Adans. +
1 (?) +  and 3 (?) +
straight +
midlength +
0.5 cm5 mm <br />0.005 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
keeled +  and rounded +
pseudopetiolate +  and branching +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
6 cm60 mm <br />0.06 m <br /> (16 cm160 mm <br />0.16 m <br />) +
not evident +
involute +  and flat +
2mm;5mm +
spikelike +
hairy +  and glabrous +
Common windgrass +  and Loose silkybent +
geniculate +
20 cm200 mm <br />0.2 m <br /> (80 cm800 mm <br />0.8 m <br />) +
not woody +
Conn. +, N.J. +, N.Y. +, Wash. +, Del. +, D.C +, Wis. +, Wyo. +, N.Mex. +, Pacific Islands (Hawaii) +, Ohio +, Pa. +, B.C. +, Ont. +, Mass. +, Maine +, Nev. +, Colo. +, Md. +, Calif. +, Oreg. +, Vt. +, Ill. +, Ind. +, Ariz. +, Idaho +, Mont. +, Tex. +, Utah +, Mo. +, Mich. +  and Ky. +
1/4 +  and 1/3 +
liquid +, soft +  and hard +
capillary +
pistillate +  and staminate +
sterile +  and bisexual +
compressed +
reduced +
shorter or longer +
subtending +
lanceolate +
unequal +
uncinate +
shorter or longer +
scabridulous +
folded +  and nearly terete +
0.16 cm1.6 mm <br />0.0016 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
lacerate +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
membranous +
inconspicuous +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
concealed +  and prominent +
2 +  and 1 +
well-developed +
2-keeled +
10cm +  and 35cm +
pyramidal +
3 cm30 mm <br />0.03 m <br /> (15 cm150 mm <br />0.15 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
dry +  and fleshy +
rounded +  and slightly keeled +
Introduced +
1 +  and 60 +
compressed +
0.24 cm2.4 mm <br />0.0024 m <br /> (0.32 cm3.2 mm <br />0.0032 m <br />) +
1 (?) +  and 3 (?) +
simple +  and compound +
2 (?) +  and 3 (?) +
Gramineae +
Apera spica-venti +
species +
membranous +
slightly shorter than to slightly longer than the florets +
0.24 cm2.4 mm <br />0.0024 m <br /> (0.32 cm3.2 mm <br />0.0032 m <br />) +
parallel +  and converging +
stoloniferous +  and rhizomatous +
aquatic +  and terrestrial +