Agrostis mertensii

Trin.
Common names: Northern bent Agrostide de mertens
Synonyms: Agrostis rupestris Agrostis mertensii subsp. borealis Agrostis borealis
Treatment appears in FNA Volume 24. Treatment on page 644.
Please click on the illustration for a higher resolution version.
Illustrator: Sandy Long

Copyright: Utah State University

Plants perennial; cespitose, not rhizomatous or stoloniferous. Culms (5) 10-40 cm, erect, with 2-4 nodes. Leaves mostly basal or basal and cauline, basal leaves persistent; sheaths smooth or scabrous; ligules 0.7-3.3 mm, scabridulous or smooth, usually rounded, sometimes acute or truncate, erose, sometimes lacerate; blades 2.5-13 cm long, 0.5-3 mm wide, usually flat, occasionally involute or folded. Panicles (2) 3-10 cm long, (0.5) 1.5-5 cm wide, widely ovate to lanceolate, usually open, exserted from the upper sheaths at maturity, lowest node with (1) 2-5 branches; branches erect, not capillary, readily visible, smooth or sparsely scabridulous, branched above midlength, spikelets in the distal 1/2 or beyond, lower branches (1.5) 2-4 cm; pedicels 0.4-6.4 mm. Spikelets lanceolate to narrowly ovate, dark-brown or purplish. Glumes subequal, 2-4 mm, elliptical to lanceolate, midveins scabrous to scabridulous, at least distally, 1-veined, acute; callus hairs to 0.4 mm, sparse; lemmas 1.6-2.6 mm, smooth or scabridulous, translucent to opaque, 5-veined, veins prominent to obscure, apices acute, entire or erose, awned from just below midlength, awns (2) 3-4.4 mm, geniculate, exserted, persistent; paleas absent, or to 0.1 mm and thin; anthers 3, 0.5-0.8 mm, usually shed at anthesis. Caryopses 1.4-2 mm; endosperm solid. 2n = 56 [reports of 2n = 42 for Agrostis scabra].

Distribution

Maine, N.H., Alta., B.C., Greenland, Man., N.B., Nfld. and Labr., N.W.T., Nunavut, Ont., Que., Sask., Yukon, Colo., Utah, Wash., N.Y., W.Va., Alaska, N.C., Vt., Tenn., Mont., Va., S.C., Wyo.

Discussion

Agrostis mertensii grows on banks and gravel bars in river and lake valleys, and on open grasslands and rocky slopes of mountains and cliffs. It has a circumboreal distribution. In the Flora region, it extends from Alaska across Canada to Newfoundland and Greenland, south in the mountains to Wyoming and Colorado in the west, and West Virginia, Tennessee, and North Carolina in the east. It also grows in arctic Europe, Scandinavia, the mountainous regions of Mexico, and northwestern South America, where some unusually robust specimens have been somewhat dubiously referred to this species.

Agrostis mertensii is frequently confused with dwarf, awned forms of A. scabra (p. 646), but has larger spikelets, more culm nodes, larger anthers, slightly wider, flatter leaves, and panicles that are less expanded and less than lh the culm length. Agrostis mertensii is also often confused with A. idahoensis (p. 649), but A. mertensii tends to grow in better-drained habitats. Agrostis mertensii differs from A. anadyrensis (see next) in being less robust, having narrower, less abundant basal leaves, smaller panicles, and minor differences in the insertion of the awns on the lemmas. In addition, the panicle branches are smooth to weakly scabrous, contrasting with the branches of A. anadyrensis, which are strongly scabrous, with long acicules throughout their length.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Agrostis mertensii"
membranous +  and scarious +
not penicillate +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
erose +  and entire +
M.J. Harvey +
1 (?) +  and 3 (?) +
2 cm20 mm <br />0.02 m <br /> (?) +
straight +
exserted +
geniculate +
0.3 cm3 mm <br />0.003 m <br /> (0.44 cm4.4 mm <br />0.0044 m <br />) +
rounded +  and keeled +
pseudopetiolate +  and branching +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
2.5 cm25 mm <br />0.025 m <br /> (13 cm130 mm <br />0.13 m <br />) +
not evident +
scabridulous +
folded +, involute +  and flat +
0.5mm;3mm +
scabridulous +  and smooth +
not capillary +
0 cm0 mm <br />0 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
hairy +  and glabrous +
Northern bent +  and Agrostide de mertens +
not branching +
10 cm100 mm <br />0.1 m <br /> (40 cm400 mm <br />0.4 m <br />) +
not woody +
Maine +, N.H. +, Alta. +, B.C. +, Greenland +, Man. +, N.B. +, Nfld. and Labr. +, N.W.T. +, Nunavut +, Ont. +, Que. +, Sask. +, Yukon +, Colo. +, Utah +, Wash. +, N.Y. +, W.Va. +, Alaska +, N.C. +, Vt. +, Tenn. +, Mont. +, Va. +, S.C. +  and Wyo. +
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 +
elliptical +  and lanceolate +
subequal +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
uncinate +
diffuse +  and dense +
cauline +  and basal +
translucent +  and opaque +
pubescent +  and glabrous +
scabridulous +  and smooth +
lanceolate +  and ovate +
0.16 cm1.6 mm <br />0.0016 m <br /> (0.26 cm2.6 mm <br />0.0026 m <br />) +
membranous +
lacerate +, acute +  and rounded +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.33 cm3.3 mm <br />0.0033 m <br />) +
membranous +
inconspicuous +
lanceolate +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
scabrous +  and scabridulous +
concealed +  and prominent +
2 +  and 4 +
2 +  and 1 +
well-developed +
2-keeled +
minute +  and subequal +
0 cm0 mm <br />0 m <br /> (0.01 cm0.1 mm <br />1.0e-4 m <br />) +
3cm +  and 10cm +
widely ovate +  and lanceolate +
1.5 cm15 mm <br />0.015 m <br /> (5 cm50 mm <br />0.05 m <br />) +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.64 cm6.4 mm <br />0.0064 m <br />) +
dry +  and fleshy +
not prolonged +
hairy +  and glabrous +
scabrous +  and scabridulous +
purplish +  and dark-brown +
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 rupestris +, Agrostis mertensii subsp. borealis +  and Agrostis borealis +
Agrostis mertensii +
Agrostis +
species +
membranous +
2 +  and 5 +
not convergent +
prominent +  and obscure +
scabrous +  and scabridulous +
stoloniferous +  and not rhizomatous +
plant +  and cespitose +
aquatic +  and terrestrial +