Muhlenbergia arenacea

(Buckley) Hitchc.
Common names: Ear muhly
Treatment appears in FNA Volume 25. Treatment on page 181.

Plants perennial; rhizomatous, not cespitose. Culms 10-30 (40) cm, decumbent, terete to some¬what compressed-keeled near the base; internodes scabridulous below the nodes. Sheaths about 1/2 as long as the internodes, margins hyaline; ligules 0.5-2 mm, hyaline, with lateral, 1-2 mm lobes; blades 0.7-4 (6) cm long, 0.5-1.7 mm wide, flat, occasionally folded, tapering, scabrous abaxially, strigulose adaxially, margins and midveins thickened, whitish, apices narrow, often sharp. Panicles 5-15 cm long, 4-14 cm wide, broadly ovoid, open; primary branches 2-8 cm, capillary, straight to slightly flexuous, diverging 45-80 (100) ° from the rachises, never appearing fascicled, naked proximally; pedicels 1-11 mm, usually longer than the spikelets. Spikelets 1.5-2.6 mm, occasionally with 2 florets. Glumes equal, 0.9-2 mm, 1-veined, usually acute to acuminate, occasionally erose and mucronate, mucros to 0.2 mm; lemmas 1.5-2.5 mm, lanceolate to oblongelliptic, plumbeous to purplish, sparsely appressed-pubescent on the lower 1/2 of the margins and midveins, hairs to 0.3 mm, apices acute to obtuse, sometimes shallowly bilobed, mucronate, mucros to 0.3 mm; paleas 1.5-2.6 mm, lanceolate, glabrous, obtuse to acute; anthers 1-1.5 mm, yellowish to purplish. Caryopses 1-1.3 mm, elliptic, brownish. 2n = unknown.

Distribution

Ariz., Colo., N.Mex., Tex.

Discussion

Muhlenbergia arenacea grows in sandy flats, plains, alluvial fans, washes, depressions, and alkaline mesas in open grasslands, at elevations of 1000-2200 m. Its range extends from the southwestern United States into northern Mexico.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Muhlenbergia arenacea"
yellowish +  and purplish +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
Mucronate (?) +, Acute (?) +  and Obtuse (?) +
Paul M. Peterson +
(Buckley) Hitchc. +
1 (?) +  and 3 (?) +
sinuous +, flexuous +  and straight +
multiple +, , +  and single +
curled +
keeled +  and rounded +
pseudopetiolate +  and branching +
not fused +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
membranous +
not pseudopetiolate +
0.7 cm7 mm <br />0.007 m <br /> (4 cm40 mm <br />0.04 m <br />) +
tapering +
0.5mm;1.7mm +
spikelike +
with hairs +  and glabrous +
compressed +, elliptic +, fusiform +  and elongate +
0.1 cm1 mm <br />0.001 m <br /> (0.13 cm1.3 mm <br />0.0013 m <br />) +
triangular +  and dome--shaped +
sometimes longer +
membranous +
Ear muhly +
compressed-keeled +  and terete +
10 cm100 mm <br />0.1 m <br /> (30 cm300 mm <br />0.3 m <br />) +
Ariz. +, Colo. +, N.Mex. +  and Tex. +
not waisted +
capillary +
pistillate +  and staminate +
bisexual +  and fertile +
round +  and compressed +
reduced +
shorter or longer +
subtending +
mucronate +, usually acute +  and acuminate +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
uncinate +
0 cm0 mm <br />0 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
paniculate +  and racemose +
hollow +  and solid +
scabridulous +
not absent +
plumbeous +  and purplish +
appressed-pubescent +
lanceolate +  and oblongelliptic +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
acuminate +  and truncate +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
membranous +
inconspicuous +
whitish +  and hyaline +
0 cm0 mm <br />0 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
concealed +  and prominent +
2 +  and 1 +
obtuse +  and acute +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.26 cm2.6 mm <br />0.0026 m <br />) +
5cm +  and 15cm +
cleistogamous +
4 cm40 mm <br />0.04 m <br /> (14 cm140 mm <br />0.14 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
dry +  and fleshy +
straight +  and slightly flexuous +
2 cm20 mm <br />0.02 m <br /> (8 cm80 mm <br />0.08 m <br />) +
spikelike +
1 +  and 60 +
compressed +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.26 cm2.6 mm <br />0.0026 m <br />) +
1 (?) +  and 3 (?) +
compound +  and simple +
2 (?) +  and 3 (?) +
Gramineae +
Muhlenbergia arenacea +
Muhlenbergia +
species +
membranous +
shorter than to longer than the florets +
7 +  and 13 +
plant +  and not cespitose +
aquatic +  and terrestrial +
dioecious +, monoecious +  and synoecious +