Muhlenbergia dubia

E. Fourn.
Common names: Pine muhly
Treatment appears in FNA Volume 25. Treatment on page 194.

Plants perennial; densely cespitose, not rhizomatous. Culms 30-100 cm, erect, rounded near the base, not rooting at the lower nodes; internodes glabrous for most of their length, minutely pubescent to hirtellous below the nodes. Sheaths longer than the internodes, smooth or scabridulous, not becoming spirally coiled when old; ligules 4-10 mm, membranous, firm, acute, lacerate; blades 10-60 cm long, 1-2 mm wide, usually involute (occasionally flat), scabrous abaxially, hispidulous adaxially. Panicles 10-40 cm long, 0.6-2.4 cm wide, contracted, grayish-green; primary branches 0.2-7 cm, diverging up to 40° from the rachises, stiff, spikelet-bearing to the base; pedicels 0.1-6 mm, strongly divergent, hispidulous. Spikelets 3.8-5 mm, grayish-green. Glumes equal, (1.8) 2-3 mm, shorter than the florets, glabrous and smooth proximally, scabridulous distally, faintly 1-veined, acute; lemmas 3.8-5 mm, narrowly lanceolate, calluses hairy, hairs to 0.5 mm, lemma bodies glabrous and smooth below, scabrous distally, apices acuminate, unawned or awned, awns to 6 mm, straight; paleas 3.8-5 mm, narrowly lanceolate, glabrous below, acuminate; anthers 1.5-2.2 mm, greenish. Caryopses 2.5-3.5 mm, fusiform, brownish. 2n = 40, 50.

Discussion

Muhlenbergia dubia grows on steep slopes, ridge tops, limestone rock outcrops, and along draws, at elevations of 1500-2300 m. Its range extends into northern Mexico. It resembles M. rigens, but differs in having looser, contracted (but not spikelike) panicles, longer ligules, olivaceous anthers, and generally longer lemmas.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number."glabrous" is not a number.

... more about "Muhlenbergia dubia"
0.15 cm1.5 mm <br />0.0015 m <br /> (0.22 cm2.2 mm <br />0.0022 m <br />) +
Paul M. Peterson +
E. Fourn. +
1 (?) +  and 3 (?) +
straight +
multiple +, , +  and single +
curled +
0 cm0 mm <br />0 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
keeled +  and rounded +
pseudopetiolate +  and branching +
not fused +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
membranous +
not pseudopetiolate +
10 cm100 mm <br />0.1 m <br /> (60 cm600 mm <br />0.6 m <br />) +
hispidulous +
involute +, folded +  and flat +
1mm;2mm +
spikelike +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
triangular +  and dome--shaped +
sometimes longer +
membranous +
Pine muhly +
not rooting +
rounded +
30 cm300 mm <br />0.3 m <br /> (100 cm1,000 mm <br />1 m <br />) +
Ariz. +, N.Mex. +  and Tex. +
not waisted +
capillary +
pistillate +  and staminate +
bisexual +  and fertile +
round +  and compressed +
reduced +
shorter or longer +
subtending +
scabridulous +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
uncinate +
0 cm0 mm <br />0 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
paniculate +  and racemose +
hollow +  and solid +
minutely pubescent +  and hirtellous +
not absent +
lanceolate +
0.38 cm3.8 mm <br />0.0038 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
lacerate +  and acute +
0.4 cm4 mm <br />0.004 m <br /> (1 cm10 mm <br />0.01 m <br />) +
firm +  and membranous +
inconspicuous +
concealed +  and prominent +
2 +  and 1 +
acuminate +  and lanceolate +
0.38 cm3.8 mm <br />0.0038 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
grayish-green +
10cm +  and 40cm +
cleistogamous +
spikelike +
0.6 cm6 mm <br />0.006 m <br /> (2.4 cm24 mm <br />0.024 m <br />) +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
dry +  and fleshy +
0.2 cm2 mm <br />0.002 m <br /> (7 cm70 mm <br />0.07 m <br />) +
spikelike +
scabridulous +  and smooth +
grayish-green +
1 +  and 60 +
compressed +
0.38 cm3.8 mm <br />0.0038 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
1 (?) +  and 3 (?) +
compound +  and simple +
2 (?) +  and 3 (?) +
Gramineae +
Muhlenbergia dubia +
Muhlenbergia +
species +
membranous +
shorter than to longer than the florets +
7 +  and 13 +
plant +  and cespitose +
aquatic +  and terrestrial +
dioecious +, monoecious +  and synoecious +