Muhlenbergia tenuifolia

(Kunth) Trin.
Common names: Slender muhly
Synonyms: Muhlenbergia monticola
Treatment appears in FNA Volume 25. Treatment on page 162.

Plants annual or short-lived perennials; cespitose, not rhizomatous. Culms 20-70 cm, erect or decumbent; internodes mostly scabridulous or smooth, always scabridulous below the nodes. Sheaths usually shorter than the internodes, glabrous, smooth or scabridulous, usually without necrotic spots, not becoming spirally coiled when old; ligules 1.2-3 (5) mm, membranous through¬out, acute, often lacerate; blades 2-13 cm long, 1.2-2.5 mm wide, flat or loosely involute, scabridulous or glabrous abaxially, scabrous adaxially, usually without necrotic spots. Panicles numerous, terminal and axillary, 7-20 cm long, 0.3-1.4 (3) cm wide, contracted, often lax, nodding, interrupted below; primary branches 3.5-7.5 cm, ascending or diverging up to 70° from the rachises, spikelet-bearing to the base; pedicels 1-3 mm, antrorsely scabrous; disarticulation above the glumes. Spikelets 2-4 mm, often purplish, borne singly. Glumes 1.2-2.8 mm, shorter than the florets, 1-veined, veins scabrous, apices often erose, unawned or awned, awns to 0.5 mm; lower glumes 1.2-2 mm, acute to acuminate; upper glumes 1.5-2.8 mm, acute; lemmas 2-3.5 (4) mm, lanceolate, mostly smooth, scabridulous distally, pubescent on the calluses, lower 1/2 of the midveins, and margins, hairs 0.5-1.5 mm, apices acuminate to acute, awned, awns 10-30 mm, scabrous, sinuous to flexuous; paleas 1.8-3.4 (3.8) mm, lanceolate, sparsely villous basally, apices acuminate to acute; anthers 0.9-1.5 mm, yellowish. Caryopses 1-2.2 mm, narrowly fusiform, brownish. Cleistogamous panicles not present. 2n = 20, 40.

Discussion

Muhlenbergia tenuifolia grows in gramma grasslands and pine-oak woodlands on rocky slopes, limestone rock outcrops, gravelly roadsides, and in sandy drainages, at elevations of 1200-2200 m. Its range extends through Mexico to northern South America.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Muhlenbergia tenuifolia"
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
Acuminate (?) +  and Acute (?) +
Paul M. Peterson +
(Kunth) Trin. +
1 (?) +  and 3 (?) +
sinuous +  and flexuous +
multiple +, , +  and single +
curled +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
keeled +  and rounded +
pseudopetiolate +  and branching +
not fused +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
membranous +
not pseudopetiolate +
2 cm20 mm <br />0.02 m <br /> (13 cm130 mm <br />0.13 m <br />) +
scabridulous +
involute +  and flat +
1.2mm;2.5mm +
spikelike +
with hairs +  and glabrous +
0.1 cm1 mm <br />0.001 m <br /> (0.22 cm2.2 mm <br />0.0022 m <br />) +
triangular +  and dome--shaped +
sometimes longer +
membranous +
Slender muhly +
decumbent +  and erect +
geniculate +
20 cm200 mm <br />0.2 m <br /> (70 cm700 mm <br />0.7 m <br />) +
Ariz. +, N.Mex. +  and Tex. +
not waisted +
capillary +
pistillate +  and staminate +
bisexual +  and fertile +
round +  and compressed +
reduced +
shorter or longer +
subtending +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.28 cm2.8 mm <br />0.0028 m <br />) +
uncinate +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
paniculate +  and racemose +
hollow +  and solid +
scabridulous +  and smooth +
not absent +
scabridulous +
lanceolate +
0.2 cm2 mm <br />0.002 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
lacerate +  and acute +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
membranous +
inconspicuous +
acute +  and acuminate +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
concealed +  and prominent +
2 +  and 1 +
lanceolate +
0.18 cm1.8 mm <br />0.0018 m <br /> (0.34 cm3.4 mm <br />0.0034 m <br />) +
7cm +  and 20cm +
cleistogamous +
spikelike +
0.3 cm3 mm <br />0.003 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
dry +  and fleshy +
diverging;ascending +
3.5 cm35 mm <br />0.035 m <br /> (7.5 cm75 mm <br />0.075 m <br />) +
spikelike +
scabridulous +  and smooth +
1 +  and 60 +
compressed +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
1 (?) +  and 3 (?) +
compound +  and simple +
2 (?) +  and 3 (?) +
Muhlenbergia monticola +
Muhlenbergia tenuifolia +
Muhlenbergia +
species +
membranous +
shorter than to longer than the florets +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.28 cm2.8 mm <br />0.0028 m <br />) +
7 +  and 13 +
short-lived +  and annual +
plant +  and cespitose +
aquatic +  and terrestrial +
dioecious +, monoecious +  and synoecious +