Muhlenbergia tenuiflora

(Willd.) Britton, Sterns & Poggenb.
Common names: Slimflowered muhly Muhlenbergie tenue
Endemic
Synonyms: Muhlenbergia tenuiflora var. variabilis
Treatment appears in FNA Volume 25. Treatment on page 160.

Plants perennial; rhizomatous, not cespitose. Culms 40-120 cm tall, less than 2 mm thick, erect; internodes mostly pubescent, retrorsely hirsute to strigose below the nodes. Sheaths mostly glabrous, usually pubescent near the base, scabridulous distally; ligules 0.4-1.2 mm, membranous, truncate, ciliolate; blades 6-20 cm long, 4-10 (15) mm wide, flat, glabrous and smooth abaxially, occasionally scabridulous adaxially. Panicles usually terminal, 10-33 cm long, 0.2-0.8 cm wide, exserted; branches 1-10 cm, ascending to appressed; pedicels 1-6 mm, strigose. Spikelets 2.6-4.5 mm, overlapping the next spikelet on the branch by 1/4 of its length. Glumes subequal, 1.3-3 mm, shorter than the lemmas, 1-veined (lower glumes rarely 2-veined or 3-veined), tapering from near the base, bases overlapping, apices scabridulous, acute, unawned or awned, awns to 1 mm; lemmas 2.6-4.5 mm, lanceolate to narrowly lanceolate, usually pubescent on the calluses, lower 1/3 of the midveins, and margins (hairs sometimes restricted to the callus), hairs shorter than 1.2 mm, apices acute or acuminate, usually awned, awns to 12 mm; paleas 2.6-4.5 mm, lanceolate to narrowly lanceolate, shortly pilose on the lower portion, apices acuminate; anthers 1.1-2.2 mm, yellowish. Caryopses 2-2.3 mm, fusiform, brown. 2n = 40.

Distribution

Conn., N.J., N.Y., W.Va., Del., D.C., Wis., Ont., Que., Nebr., Okla., N.H., Tenn., N.C., S.C., Pa., R.I., Va., Ala., Mass., Vt., Ark., Ill., Ga., Ind., Iowa, Md., Ohio, Mo., Mich., Miss., Ky.

Discussion

Muhlenbergia tenuiflora grows only in the Flora region, usually being found on sandy or rocky slopes derived from sandstone, chert, or limestone formations, in mixed hardwood and oak-hickory forests, at elevations of 40-1500 m. It resembles the Asiatic species M. curviaristata (Ohwi) Ohwi.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Muhlenbergia tenuiflora"
0.11 cm1.1 mm <br />0.0011 m <br /> (0.22 cm2.2 mm <br />0.0022 m <br />) +
scabridulous +
Acuminate (?) +  and Acute (?) +
Paul M. Peterson +
(Willd.) Britton, Sterns & Poggenb. +
1 (?) +  and 3 (?) +
sinuous +, flexuous +  and straight +
multiple +, , +  and single +
curled +
0 cm0 mm <br />0 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
keeled +  and rounded +
pseudopetiolate +  and branching +
overlapping +
not fused +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
membranous +
not pseudopetiolate +
6 cm60 mm <br />0.06 m <br /> (20 cm200 mm <br />0.2 m <br />) +
scabridulous +
involute +, folded +  and flat +
4mm;10mm +
ascending;appressed +
spikelike +
with hairs +  and glabrous +
0.2 cm2 mm <br />0.002 m <br /> (0.23 cm2.3 mm <br />0.0023 m <br />) +
triangular +  and dome--shaped +
sometimes longer +
membranous +
Slimflowered muhly +  and Muhlenbergie tenue +
40 cm400 mm <br />0.4 m <br /> (120 cm1,200 mm <br />1.2 m <br />) +
geniculate +
2 cm20 mm <br />0.02 m <br /> (300 cm3,000 mm <br />3 m <br />) +
0 cm0 mm <br />0 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Conn. +, N.J. +, N.Y. +, W.Va. +, Del. +, D.C. +, Wis. +, Ont. +, Que. +, Nebr. +, Okla. +, N.H. +, Tenn. +, N.C. +, S.C. +, Pa. +, R.I. +, Va. +, Ala. +, Mass. +, Vt. +, Ark. +, Ill. +, Ga. +, Ind. +, Iowa +, Md. +, Ohio +, Mo. +, Mich. +, Miss. +  and Ky. +
not waisted +
capillary +
pistillate +  and staminate +
bisexual +  and fertile +
round +  and compressed +
reduced +
shorter or longer +
subtending +
tapering +
subequal +
0.13 cm1.3 mm <br />0.0013 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
uncinate +
1.2 cm12 mm <br />0.012 m <br /> (?) +
paniculate +  and racemose +
hollow +  and solid +
retrorsely hirsute +  and strigose +
not absent +
lanceolate +  and narrowly lanceolate +
0.26 cm2.6 mm <br />0.0026 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
acuminate +  and truncate +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
membranous +
inconspicuous +
concealed +  and prominent +
2 +  and 1 +
lanceolate +  and narrowly lanceolate +
0.26 cm2.6 mm <br />0.0026 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
10cm +  and 33cm +
cleistogamous +
spikelike +
0.2 cm2 mm <br />0.002 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
dry +  and fleshy +
spikelike +
pubescent +  and glabrous +
scabridulous +
1 +  and 60 +
compressed +
0.26 cm2.6 mm <br />0.0026 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
1 (?) +  and 3 (?) +
compound +  and simple +
2 (?) +  and 3 (?) +
Muhlenbergia tenuiflora var. variabilis +
Muhlenbergia tenuiflora +
Muhlenbergia +
species +
membranous +
shorter than to longer than the florets +
7 +  and 13 +
plant +  and not cespitose +
aquatic +  and terrestrial +
dioecious +, monoecious +  and synoecious +