Piptatherum canadense

(Poir.) Dorn
Common names: Canadian piptatherum Oryzopsis du canada
Synonyms: Oryzopsis canadensis
Treatment appears in FNA Volume 24. Treatment on page 146.

Plants cespitose, not rhizomatous. Culms 30-90 cm, glabrous; basal branching mostly intravaginal. Leaves basally concentrated; sheaths smooth or scabridulous; ligules 1-4 mm, hyaline, truncate, rounded, or acute; basal blades 4-15 cm long, 1-1.5 mm wide when flat, 0.5-0.8 mm in diameter when folded or convolute. Panicles 9-15 cm, lower nodes with 1-2 branches; branches 1-6 cm, somewhat flexuous, ascending to divergent. Glumes subequal, 3-6 mm long, 1.3-2 mm wide, ovate, 1-3-veined, apices acute to mucronate; florets 2.2-4.5 mm, obovoid, dorsally compressed; calluses 0.2-0.5 mm, hairy, disarticulation scars elliptic; lemmas coriaceous, evenly pubescent, tan at maturity, margins widely separated even when immature; awns 5-15 mm, persistent, once or twice-geniculate, first segments strongly twisted; paleas similar to the lemmas in length, texture, and pubescence; anthers 1-2 mm; ovaries developing 2 conelike style bases, each bearing a single, unbranched style. Caryopses about 2.5 mm long, 0.5 mm thick; hila linear, almost equaling the caryopses. 2n = 22.

Discussion

Piptatherum canadense grows in grasslands and open woods, from the British Columbia-Alberta border east to Newfoundland, extending south into the Great Lakes region and the northeastern United States. Its persistent, longer awns distinguish P. canadense from P. pungens.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number."prolonged" is not a number.

... more about "Piptatherum canadense"
membranous +  and scarious +
penicillate +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
awned +, bifid +, bilobed +  and entire +
not stiff +
hairy +  and glabrous +
Acute (?) +  and Mucronate (?) +
Mary E. Barkworth +
(Poir.) Dorn +
twisted +  and not branched +
1 (?) +  and 3 (?) +
20 cm200 mm <br />0.2 m <br /> (?) +
straight +
subterminal +  and eccentric +
2 times-geniculate scabrous +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
keeled +  and rounded +
4 cm40 mm <br />0.04 m <br /> (15 cm150 mm <br />0.15 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
not branching +
extravaginal +
swelling +
not evident +
tapering +
0.5mm;16mm +
spikelike +
well-developed +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
Canadian piptatherum +  and Oryzopsis du canada +
perennial +  and annual +
intravaginal +  and basal +
30 cm300 mm <br />0.3 m <br /> (90 cm900 mm <br />0.9 m <br />) +
not woody +
Md. +, N.J. +, Utah +, Calif. +, Pa. +, Ariz. +, Idaho +  and Nev. +
0 +  and 1/3 +
liquid +, soft +  and hard +
capillary +
pistillate +  and staminate +
sometimes longer +
compressed +  and obovoid +
2.2mm +  and 4.5mm +
3mm +  and 6mm +
subtending +
subequal +
membranous +
1.3mm +  and 2mm +
not spreading +
uncinate +
0.5 cm5 mm <br />0.005 m <br /> (?) +
3 cm30 mm <br />0.03 m <br /> (40 cm400 mm <br />0.4 m <br />) +
solid +  and hollow +
basally concentrated +  and evenly distributed +
ovate +, rectangular +  and lanceolate +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
coriaceous +
acute +, rounded +  and truncate +
0.1 cm1 mm <br />0.001 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
membranous +
inconspicuous +
lanceolate +
fleshy +  and membranous +
concealed +  and prominent +
1 +  and 6 +
2 +  and 1 +
pubescent +  and glabrous +
well-developed +
2(3)-veined +
not keeled +
reduced +
pubescence +
9 cm90 mm <br />0.09 m <br /> (15 cm150 mm <br />0.15 m <br />) +
dry +  and fleshy +
not prolonged +
smooth to scabrous +
scabridulous +  and smooth +
1 +  and 60 +
unisexual +  and bisexual +
laterally compressed +  and terete +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.75 cm7.5 mm <br />0.0075 m <br />) +
1 (?) +  and 3 (?) +
simple +  and compound +
2 (?) +  and 3 (?) +
Oryzopsis canadensis +
Piptatherum canadense +
Piptatherum +
species +
membranous +
plant +  and cespitose +
aquatic +  and terrestrial +