Agrostis microphylla

Steud.
Common names: Small-leaf bent
Treatment appears in FNA Volume 24. Treatment on page 661.
Please click on the illustration for a higher resolution version.
Illustrator: Sandy Long

Copyright: Utah State University

Plants annual. Culms 8-45 cm, erect. Leaves usually mostly cauline, sometimes mostly basal; sheaths glabrous or pubescent; upper sheaths usually inflated; ligules 1.4-4.5 mm, dorsal surfaces scabridulous, apices truncate to acute, lacerate to erose; blades 3-15 cm long, 0.7-2.5 mm wide, flat, becoming involute, finely scabrous. Panicles 2-12 cm long, 0.4-2 cm wide, cylindrical, spikelike, dense, occasionally lobed or interrupted near the base, appearing bristly from the awns, usually exserted from the upper sheaths at maturity; branches 0.3-1.5 cm, scabrous to scabridulous, ascending to appressed, spikelet-bearing to the base and hidden by the spikelets; pedicels 0.3-3 mm. Spikelets lanceolate, greenish to yellowish, tinged with purple. Glumes equal to subequal, 2.5-5 mm, scabrous over the midvein and often scabridulous on the body, 1-veined, apices narrowly acuminate to awn-tipped, awns to 1.5 mm; callus hairs to 0.5 (1) mm, usually dense; lemmas 1.5-2.3 mm, scabrous, translucent to opaque, 5-veined, veins prominent distally, apices acute, veins extended into 2 (4) teeth, teeth 0.1-0.5 mm, awned from about midlength or above, awns 3.5-8 mm, geniculate; paleas absent, or to 0.2 mm and thin; anthers 3, 0.4-0.6 mm, often retained at the apices of the caryopses. Caryopses 0.9-1.3 mm; endosperm soft. 2n = 56.

Distribution

Calif., Oreg., Wash., B.C.

Discussion

Agrostis microphylla grows in thin, rocky soils, sandy areas, cliffs, vernal pools, and serpentine areas. It is a winter annual, flowering in late winter to spring, adapted to low-competition habitats with summer drought. It may be related to, or conspecific with, Agrostis hendersonii (see previous).

Agrostis microphylla grows mostly along the Pacific coast from British Columbia to northern Baja California, Mexico. Reports of A. microphylla from the Humboldt Mountains, Nevada, reflect Vasey's treat¬ment of a specimen of A. exarata as the type of a new variety, A. microphylla var. major Vasey.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Agrostis microphylla"
membranous +  and scarious +
not penicillate +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
awned +, truncate +  and entire +
Acute (?) +, Acuminate (?) +, Lacerate (?) +  and Truncate (?) +
M.J. Harvey +
Steud. +
1 (?) +  and 3 (?) +
straight +
basal +  and terminal +
geniculate +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
rounded +  and keeled +
pseudopetiolate +  and branching +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
3 cm30 mm <br />0.03 m <br /> (15 cm150 mm <br />0.15 m <br />) +
not evident +
scabridulous +
cross +, linear +  and narrowly lanceolate +
0.7mm;2.5mm +
ascending;appressed +
scabrous +  and scabridulous +
spikelike +
0 cm0 mm <br />0 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
hairy +  and glabrous +
Small-leaf bent +
not branching +
8 cm80 mm <br />0.08 m <br /> (45 cm450 mm <br />0.45 m <br />) +
not woody +
Calif. +, Oreg. +, Wash. +  and B.C. +
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 +
scabridulous +
subequal +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
uncinate +
diffuse +  and dense +
basal +  and cauline +
translucent +  and opaque +
pubescent +  and glabrous +
warty-tuberculate +  and scabridulous +
lanceolate +  and ovate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.23 cm2.3 mm <br />0.0023 m <br />) +
membranous +
0.14 cm1.4 mm <br />0.0014 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
membranous +
inconspicuous +
lanceolate +
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 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 />) +
2cm +  and 12cm +
lobed +, spikelike +  and cylindrical +
0.4 cm4 mm <br />0.004 m <br /> (2 cm20 mm <br />0.02 m <br />) +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
dry +  and fleshy +
not prolonged +
pubescent +  and glabrous +
scabrous +  and scabridulous +
tinged with purple +, greenish +  and yellowish +
1 +  and 60 +
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 microphylla +
Agrostis +
species +
membranous +
geniculate +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
not convergent +
scabrous +  and scabridulous +
extended +
stoloniferous +  and rhizomatous +
aquatic +  and terrestrial +