Agrostis pallens

Trin.
Common names: Dune bent
Synonyms: Agrostis diegoensis Agrostis lepida
Treatment appears in FNA Volume 24. Treatment on page 651.
Please click on the illustration for a higher resolution version.
Illustrator: Sandy Long

Copyright: Utah State University

Plants perennial; rhizomatous, rhizomes to 10 cm, not stoloniferous. Culms 10-70 cm, erect, sometimes decumbent at the base, sometimes rooting at the lower nodes, with 3-7 nodes. Leaves usually cauline; sheaths usually smooth, sometimes scabridulous; ligules 1-6 mm, dorsal surfaces scabrous, apices truncate to rounded or acute, often lacerate to erose; blades 1.5-11.5 cm long, 1-6 mm wide, flat, becoming involute. Panicles 5-20 cm long, 0.4-6 (8) cm wide, lanceolate to narrowly ovate, open to contracted, exserted from the upper sheaths at maturity, lowest node with 1-8 branches; branches scabrous to scabridulous, usually ascending, branching below midlength, the majority spikelet-bearing to the base, lower branches 2-5 cm; pedicels 0.5-7 mm. Spikelets lanceolate to narrowly ovate, green to yellowish green or yellow, tinged with purple. Glumes equal to subequal, 2-3.5 mm, scabrous over the midvein and sometimes also sparsely over the body, 1 (3) -veined, acute to acuminate; callus hairs to 0.3 (1) mm, sparse; lemmas 1.5-2.5 mm, smooth or scabridulous or warty, 5-veined, veins prominent throughout or only distally, apices acute, entire or the veins excurrent to about 0.2 mm, usually unawned, rarely awned from below the apices, awns to 0.5 (2.7) mm, straight; paleas absent, or to 0.2 mm and thin; anthers 3, 0.7-1.8 mm. Caryopses 1-1.5 mm; endosperm solid. 2n = 42, 56.

Distribution

Wash., B.C., Calif., Idaho, Mont., Oreg., Nev.

Discussion

Agrostis pollens grows on coastal sands and cliffs, in meadows, and in open, xeric woodlands to subalpine woodlands at 3500 m. It extends from British Columbia south into Baja California, Mexico, and east to western Montana and Utah. The relationship of the higher-elevation, more open-panicled plants to those of lower elevations merits further study.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Agrostis pallens"
membranous +  and scarious +
not penicillate +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
M.J. Harvey +
1 (?) +  and 3 (?) +
2.7 cm27 mm <br />0.027 m <br /> (?) +
straight +
basal +  and terminal +
geniculate +
0 cm0 mm <br />0 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
rounded +  and keeled +
pseudopetiolate +  and branching +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
1.5 cm15 mm <br />0.015 m <br /> (11.5 cm115 mm <br />0.115 m <br />) +
not evident +
scabridulous +
cross +, linear +  and narrowly lanceolate +
1mm;6mm +
scabrous +  and scabridulous +
spikelike +
0 cm0 mm <br />0 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
hairy +  and glabrous +
Dune bent +
10 cm100 mm <br />0.1 m <br /> (70 cm700 mm <br />0.7 m <br />) +
not woody +
Wash. +, B.C. +, Calif. +, Idaho +, Mont. +, Oreg. +  and Nev. +
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 +
0.2 cm2 mm <br />0.002 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
uncinate +
diffuse +  and dense +
pubescent +  and glabrous +
warty +, scabridulous +  and smooth +
lanceolate +  and ovate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
membranous +
0.1 cm1 mm <br />0.001 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
membranous +
inconspicuous +
lanceolate +
2 cm20 mm <br />0.02 m <br /> (5 cm50 mm <br />0.05 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 +
3 +  and 7 +
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 />) +
5cm +  and 20cm +
lanceolate +  and narrowly ovate +
0.4 cm4 mm <br />0.004 m <br /> (6 cm60 mm <br />0.06 m <br />) +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
dry +  and fleshy +
not prolonged +
hairy +  and glabrous +
scabridulous +
tinged with purple +, green +  and yellowish green or yellow +
1 +  and 60 +
lanceolate +  and narrowly ovate +
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 (?) +
Agrostis diegoensis +  and Agrostis lepida +
Agrostis pallens +
Agrostis +
species +
membranous +
2 +  and 5 +
not convergent +
scabrous +  and scabridulous +
aquatic +  and terrestrial +