Agrostis variabilis

Rydb.
Common names: Mountain bent
Endemic
Treatment appears in FNA Volume 24. Treatment on page 654.
Please click on the illustration for a higher resolution version.
Illustrator: Sandy Long

Copyright: Utah State University

Plants perennial; cespitose, rarely rhizomatous, rhizomes to 2 cm. Culms 5-30 cm, erect, sometimes geniculate at the base, with 2-5 (7) nodes. Leaves mostly basal, forming dense tufts; sheaths smooth; ligules (0.7) 1-2.8 mm, dorsal surfaces usually scabridulous, sometimes smooth, apices rounded to truncate, lacerate to erose; blades 3-7 cm long, 0.5-2 mm wide, flat, becoming folded or involute. Panicles (1) 2.5-6 cm long, 0.3-1.2 (2) cm wide, cylindric to lanceolate, usually dense, exserted from the upper sheaths at maturity, lowest node with 1-5 branches; branches usually scabridulous, sometimes smooth, ascending to erect, branching at or near the base and spikelet-bearing to the base, to branching in the distal 2/3, lower branches 0.5-1.5 cm; pedicels 0.4-2.8 (4.3) mm. Spikelets ovate to lanceolate, greenish purple. Glumes subequal to equal, 1.8-2.5 mm, smooth, or scabrous on the keel and sometimes elsewhere, 1-veined, acute to acuminate; callus hairs to 0.2 mm, sparse to abundant; lemmas 1.5-2 mm, smooth, translucent, (3) 5-veined, veins usually prominent distally, sometimes obscure throughout, apices acute, entire, usually unawned, rarely awned, awns to 1 (2.8) mm, arising beyond the midpoint, usually not reaching the lemma apices; paleas to 0.2 mm, thin; anthers 3, 0.4-0.7 (1) mm. Caryopses 1-1.3 mm; endosperm soft. 2n = 28.

Distribution

Colo., N.Mex., Wash., Utah, Alta., B.C., Idaho, Mont., Wyo., Calif., Nev., Oreg.

Discussion

Agrostis variabilis grows in alpine and subalpine meadows and forests and on talus slopes, at elevations up to 4000 m, from British Columbia and Alberta south to California and New Mexico. It can appear similar to dwarf forms of Podagrostis humilis (p. 694), but differs from that species in not having paleas.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Agrostis variabilis"
membranous +  and scarious +
1 cm10 mm <br />0.01 m <br /> (?) +
not penicillate +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
awned +  and entire +
Acute (?) +, Lacerate (?) +, Rounded (?) +  and Truncate (?) +
M.J. Harvey +
1 (?) +  and 3 (?) +
2.8 cm28 mm <br />0.028 m <br /> (?) +
straight +
basal +  and terminal +
geniculate +
0 cm0 mm <br />0 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
rounded +  and keeled +
pseudopetiolate +  and branching +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
3 cm30 mm <br />0.03 m <br /> (7 cm70 mm <br />0.07 m <br />) +
not evident +
scabridulous +
involute +  and folded +
0.5mm;2mm +
ascending;erect +
scabridulous +
spikelike +
sparse +  and abundant +
0 cm0 mm <br />0 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
hairy +  and glabrous +
Mountain bent +
not branching +
geniculate +
5 cm50 mm <br />0.05 m <br /> (30 cm300 mm <br />0.3 m <br />) +
not woody +
Colo. +, N.Mex. +, Wash. +, Utah +, Alta. +, B.C. +, Idaho +, Mont. +, Wyo. +, Calif. +, Nev. +  and Oreg. +
1/4 +  and 1/3 +
liquid +, soft +  and hard +
capillary +
pistillate +  and staminate +
sometimes longer +
sterile +  and bisexual +
compressed +
reduced +
(1)1.3-2(4) times longer than +
subtending +
acute +  and acuminate +
subequal +
0.18 cm1.8 mm <br />0.0018 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
uncinate +
diffuse +  and dense +
pubescent +  and glabrous +
warty-tuberculate +  and scabridulous +
lanceolate +  and ovate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
membranous +
0.1 cm1 mm <br />0.001 m <br /> (0.28 cm2.8 mm <br />0.0028 m <br />) +
membranous +
inconspicuous +
lanceolate +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
concealed +  and prominent +
2 +  and 5 +
2 +  and 1 +
well-developed +
2-keeled +
minute +  and subequal +
0 cm0 mm <br />0 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
2.5cm +  and 6cm +
cylindric +  and lanceolate +
0.3 cm3 mm <br />0.003 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
4.3 cm43 mm <br />0.043 m <br /> (?) +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.28 cm2.8 mm <br />0.0028 m <br />) +
dry +  and fleshy +
not prolonged +
hairy +  and glabrous +
scabrous +  and scabridulous +
greenish purple +
1 +  and 60 +
ovate +  and lanceolate +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
1 (?) +  and 3 (?) +
simple +  and compound +
2 (?) +  and 3 (?) +
Gramineae +
Agrostis variabilis +
Agrostis +
species +
membranous +
2 +  and 5 +
not convergent +
obscure +  and prominent +
scabrous +  and scabridulous +
plant +  and cespitose +
aquatic +  and terrestrial +