Muhlenbergia expansa

(Poir.) Trin.
Common names: Savannah hairgrass
Endemic
Synonyms: Muhlenbergia capillaris var. trichopodes
Treatment appears in FNA Volume 25. Treatment on page 188.

Plants perennial; cespitose, not rhizomatous. Culms 60-100 (150) cm, erect from the base, not conspicuously branched; internodes mostly glabrous, sometimes puberulent below the nodes. Sheaths glabrous or puberulent, rounded basally, becoming fibrous, not flat or spirally coiled, at maturity; ligules 1.8-5 (10) mm, membranous, firm, strongly decurrent, obtuse; blades 20-50 (80) cm long, 2-4 mm wide, flat or involute, smooth abaxially, scabrous adaxially. Panicles 15-50 (60) cm long, 5-30 cm wide, longer than wide, diffuse; primary branches 2-20 cm, capillary, spreading 30-100° from the rachises, naked basally, lower branches with 5-20 spikelets; pedicels 4-50 mm, longer than the spikelets, capillary, flexible, widely divergent at maturity. Spikelets 3-5 mm, often purplish, sometimes brownish or bronze. Glumes subequal, 1.5-3.3 mm, shorter than the florets, glabrous; lower glumes 1-veined, unawned; upper glumes usually 1-veined, rarely 3-veined, acute to acuminate, often erose, sometimes mucronate; lemmas 3-5 mm, lanceolate, calluses shortly pubescent, apices acuminate, without setaceous teeth, usually unawned, if, as rarely, awned, awns 1-3 mm, clearly demarcated from the lemma bodies; paleas 2-4.5 mm, lanceolate, acuminate, unawned; anthers 1.5-2 mm, purple. Caryopses 2-2.5 mm, narrowly elliptic, brownish. 2n = unknown.

Distribution

Va., Ga., Tex., La., Ala., N.C., S.C., Miss., Ky., Fla.

Discussion

Muhlenbergia expansa grows in perennially moist to wet soils in pitcher plant bogs, pine savannahs, and flat-woods, usually in sandy soils and at elevations of 0-300 m. Its primary range is the coastal plain of the south-eastern United States.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Muhlenbergia expansa"
olivaceous +, yellow +, orange +  and purple +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Paul M. Peterson +
(Poir.) Trin. +
1 (?) +  and 3 (?) +
sinuous +, flexuous +  and straight +
multiple +, , +  and single +
curled +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
keeled +  and rounded +
pseudopetiolate +  and branching +
not fused +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
membranous +
not pseudopetiolate +
20 cm200 mm <br />0.2 m <br /> (50 cm500 mm <br />0.5 m <br />) +
pubescent +  and glabrous +
involute +  and flat +
2mm;4mm +
spikelike +
compressed +, elliptic +, fusiform +  and elongate +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
triangular +  and dome--shaped +
sometimes longer +
membranous +
Savannah hairgrass +
geniculate +
60 cm600 mm <br />0.6 m <br /> (100 cm1,000 mm <br />1 m <br />) +
Va. +, Ga. +, Tex. +, La. +, Ala. +, N.C. +, S.C. +, Miss. +, Ky. +  and Fla. +
not waisted +
capillary +
pistillate +  and staminate +
bisexual +  and fertile +
round +  and compressed +
reduced +
(0)1(2-3)-veined +
shorter or longer +
subtending +
subequal +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.33 cm3.3 mm <br />0.0033 m <br />) +
uncinate +
paniculate +  and racemose +
hollow +  and solid +
puberulent +  and glabrous +
not absent +
lanceolate +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
obtuse +  and decurrent +
0.18 cm1.8 mm <br />0.0018 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
firm +  and membranous +
inconspicuous +
concealed +  and prominent +
2 +  and 1 +
acuminate +  and lanceolate +
0.2 cm2 mm <br />0.002 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
15cm +  and 50cm +
longer than wide +
cleistogamous +
spikelike +
5 cm50 mm <br />0.05 m <br /> (30 cm300 mm <br />0.3 m <br />) +
capillary +
0.4 cm4 mm <br />0.004 m <br /> (5 cm50 mm <br />0.05 m <br />) +
dry +  and fleshy +
2 cm20 mm <br />0.02 m <br /> (20 cm200 mm <br />0.2 m <br />) +
spikelike +
puberulent +  and glabrous +
bronze +, brownish +  and purplish +
5 +  and 20 +
compressed +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
1 (?) +  and 3 (?) +
compound +  and simple +
2 (?) +  and 3 (?) +
Muhlenbergia capillaris var. trichopodes +
Muhlenbergia expansa +
Muhlenbergia +
species +
membranous +
setaceous +
3-veined +  and 1-veined +
shorter than to longer than the florets +
mucronate +, acute +  and acuminate +
7 +  and 13 +
plant +  and cespitose +
aquatic +  and terrestrial +
dioecious +, monoecious +  and synoecious +