Dichanthelium acuminatum subsp. fasciculatum

(Torr.) Freckmann & Lelong
Common names: Panic laineux
Synonyms: Panicum tennesseense Panicum subvillosum Panicum pacificum Panicum occidentale Panicum lanuginosum var. tennesseense Panicum lanuginosum var. septentrionale Panicum lanuginosum var. huachucae Panicum lanuginosum var. fasciculatum Panicum huachucae var. fasciculatum Panicum huachucae Panicum acuminatum var. fasciculatum
Treatment appears in FNA Volume 25. Treatment on page 425.

Plants yellowish-green to olivaceous or purplish. Culms 15-75 cm, suberect, ascending or spreading; nodes often with spreading hairs, occasionally with a glabrous ring below. Cauline sheaths with ascending to spreading, papillose-based hairs, occasionally with shorter hairs underneath; midculm sheaths about 1/2 as long as the internodes; blades 5-12 cm long, 6-12 mm wide, spreading to ascending, bases with papillose-based cilia, abaxial surfaces usually pubescent, adaxial surfaces pilose or glabrous, hairs shorter than 3 mm. Spikelets 1.5-2 mm (tending to longer in the western part of its range), obovoid to ellipsoid.

Discussion

Dichanthelium acuminatum subsp. fasciculatum grows primarily in disturbed areas, open or cut-over woods, thickets, and grasslands, in dry to moist soils, including river banks, lake margins, and marshy areas. It is widespread in temperate North America, growing from Canada to Mexico, but it is somewhat less common in the western part of its range, where it often occurs on moister areas.

Dichanthelium acuminatum subsp. fasciculatum includes probably the most widespread, ubiquitous, and variable assemblages of forms in the species. It is not always clearly separable from the other subspecies of D. acuminatum, especially subsp. acuminatum, subsp. implicatum, and subsp. lindheimeri. Gene exchange with other Dichanthelium species (including D. dichotomum, D. laxiflorum, D. ovale, D. commutatum, and D. boreale) probably occurs not infrequently.

Selected References

None.

Lower Taxa

None.

"usually distinctly longer and narrower" is not a number."decumbent" is not a number.

glabrous +  and pilose +
decumbent +, spreading +  and erect +
rounded +  and attenuate +
anatomy +  and kranz +
Mary E. Barkworth +
(Torr.) Freckmann & Lelong +
1 (?) +  and 3 (?) +
keeled +  and rounded +
well-differentiated +
pseudopetiolate +  and branching +
divergent +  and parallel +
intravaginal +, extravaginal +, branching +  and basal +
subcordate +  and rounded +
swelling +
disarticulating +  and pseudopetiolate +
grayish-green +  and olivaceous +
distinct +
5 cm50 mm <br />0.05 m <br /> (12 cm120 mm <br />0.12 m <br />) +
ovate +  and lanceolate +
0.6 cm6 mm <br />0.006 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
spikelike +
0 cm0 mm <br />0 m <br /> (1 cm10 mm <br />0.01 m <br />) +
not developed +
terete +  and compressed +
papillose-based +
sometimes longer +
Panic laineux +
decumbent +  and sprawling +
spreading +, ascending +  and suberect +
15 cm150 mm <br />0.15 m <br /> (75 cm750 mm <br />0.75 m <br />) +
Conn. +, N.J. +, N.Y. +, Wash. +, Va. +, Del. +, D.C. +, Wis. +, W.Va. +, Alta. +, B.C. +, Man. +, N.B. +, N.S. +, Ont. +, P.E.I. +, Que. +, Sask. +, Mass. +, Maine +, N.H. +, R.I. +, Vt. +, Fla. +, Wyo. +, N.Mex. +, Tex. +, La. +, Tenn. +, N.C. +, S.C. +, Pa. +, Calif. +, Puerto Rico +, Colo. +, Miss. +, Ala. +, Ark. +, Kans. +, Mo. +, N.Dak. +, Nebr. +, Okla. +, S.Dak. +, Mich. +, Minn. +, Ill. +, Ga. +, Ind. +, Iowa +, Ariz. +, Idaho +, Md. +, Ohio +, Utah +, Oreg. +, Mont. +, Pacific Islands (Hawaii) +, Nev. +  and Ky. +
capillary +
germination +
pistillate +  and staminate +
sometimes longer +
compressed +  and terete +
shorter or longer +
subtending +
unequal +
membranous +
papillose-based +
ascending +  and spreading +
uncinate +
3 cm30 mm <br />0.03 m <br /> (?) +
Oval (?) +  and Round (?) +
bracteate +  and ebracteate +
olive green or grayish-green +  and yellowish-green +
glabrous +  and pubescent +
cauline +  and basal +
coriaceous +
0.1 cm1 mm <br />0.001 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
membranous +
inconspicuous +
1/4 +  and 1/2 +
obtuse +  and acute +
glabrous +  and ciliate +
whitish-scabridulous +
complex +  and simple +
concealed +  and prominent +
pubescent +  and glabrous +
swollen +
2 +  and 1 +
subterranean +
dry +  and fleshy +
3 cm30 mm <br />0.03 m <br /> (12 cm120 mm <br />0.12 m <br />) +
pilose +, puberulent +  and glabrous +
pubescent +, densely +  and glabrous +
in triplets +  and paired +
yellowish-green +  and olivaceous or purplish +
1 +  and 60 +
unisexual +  and bisexual +
obovoid +  and ellipsoid +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
1 +  and 3 +
fused +  and free +
2 +  and 3 +
dome--shaped +  and triangular +
Panicum tennesseense +, Panicum subvillosum +, Panicum pacificum +, Panicum occidentale +, Panicum lanuginosum var. tennesseense +, Panicum lanuginosum var. septentrionale +, Panicum lanuginosum var. huachucae +, Panicum lanuginosum var. fasciculatum +, Panicum huachucae var. fasciculatum +, Panicum huachucae +  and Panicum acuminatum var. fasciculatum +
Dichanthelium acuminatum subsp. fasciculatum +
Dichanthelium acuminatum +
subspecies +
membranous +
0.11 cm1.1 mm <br />0.0011 m <br /> (0.17 cm1.7 mm <br />0.0017 m <br />) +
obtuse +  and acute or minutely umbonate or apiculate +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
chartaceous-indurate +
decumbent +, spreading +  and erect +
involute +  and flat +
decumbent +, spreading +  and erect +
decumbent +, spreading +  and erect +
decumbent +, spreading +  and erect +
decumbent +, spreading +  and erect +
yellowish-green +  and olivaceous or purplish +
aquatic +  and terrestrial +
dioecious +, monoecious +  and synoecious +