Panicum hemitomon

Schult.
Common names: Maidencane
Endemic
Treatment appears in FNA Volume 25. Treatment on page 484.

Plants perennial; robust, aquatic or semiaquatic, forming extensive colonies through spreading rhizomes. Culms 50-200 cm, mostly erect and sterile, glabrous, often rooting from the lower nodes if submerged. Sheaths usually glabrous, or pilose or hirsute at the lowermost sheath, especially distally; ligules shorter than 1 mm; blades 8-35 cm long, 5-15 mm wide, ascending or spreading, abaxial surfaces glabrous, adaxial surfaces usually scabridulous or pubescent, bases slightly narrowed, margins scabrous, apices long-tapering. Panicles 10-30 cm long, less than 1 cm wide; branches mostly short, appressed-ascending, with fascicles of congested spikelets; ultimate branchlets 1-sided; pedicels 0.2-1.8 mm. Spikelets 2-2.8 mm, subsessile, lanceoloid, slightly laterally compressed, glabrous, acute. Lower glumes about 1/2 as long as the spikelets, slightly keeled along the midveins, 3-veined, acute; upper glumes and lower lemmas similar, glumes slightly shorter than the lemmas, faintly keeled on the back, acute; lower florets staminate; lower paleas subequal to the lower lemmas; upper florets 2-2.5 mm, 2/5 to almost as long as the spikelets, narrowly ellipsoid; upper lemmas relatively thin, flexible, pale, acuminate, clasping the paleas only at the base. 2n = 36, 40.

Distribution

Md., N.J., Miss., Tex., La., Del., Ala., Tenn., N.C., S.C., Va., Ga., Fla.

Discussion

Panicum hemitomon forms extensive, nearly pure stands in water or wet soils such as marshes, swamps, and along the shores of streams, canals, ditches, lakes, and ponds. It is restricted to the United States.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number."elongated" is not a number.

... more about "Panicum hemitomon"
puberulent +
anatomy +  and kranz +
Robert W. Freckmann +  and Michel G. Lelong +
Schult. +
1 (?) +  and 3 (?) +
keeled +  and rounded +
divergent +  and parallel +
intravaginal +, extravaginal +, branching +  and basal +
narrowed +
swelling +
membranous +
disarticulating +  and pseudopetiolate +
non-radiate +  and radiate +
8 cm80 mm <br />0.08 m <br /> (35 cm350 mm <br />0.35 m <br />) +
pubescent +  and glabrous +
filiform +  and ovate flat +
5mm;15mm +
spikelike +
not developed +
terete +  and compressed +
sometimes longer +
extensive +
Maidencane +
small green +
50 cm500 mm <br />0.5 m <br /> (200 cm2,000 mm <br />2 m <br />) +
succulent +
Md. +, N.J. +, Miss. +, Tex. +, La. +, Del. +, Ala. +, Tenn. +, N.C. +, S.C. +, Va. +, Ga. +  and Fla. +
capillary +
germination +
pistillate +  and staminate +
sometimes longer +
compressed +  and terete +
shorter or longer +
subtending +
pubescent +  and glabrous +
tuberculate +
acute +  and keeled +
unequal +
membranous +
uncinate +
Oval (?) +  and Round (?) +
bracteate +  and ebracteate +
hollow +  and solid +
coriaceous +
lacerate +  and ciliate +
1 cm10 mm <br />0.01 m <br /> (?) +
membranous +
inconspicuous +
acute +  and keeled +
complex +  and simple +
concealed +  and prominent +
2 +  and 1 +
10cm +  and 30cm +
subterranean +
0 cm0 mm <br />0 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
dry +  and fleshy +
extensive +
hirsute +, pilose +  and glabrous +
in triplets +  and paired +
appressed-ascending +
1 +  and 60 +
unisexual +  and bisexual +
acute +, compressed +  and lanceoloid +
0.2 cm2 mm <br />0.002 m <br /> (0.28 cm2.8 mm <br />0.0028 m <br />) +
1 (?) +  and 3 (?) +
compound +  and simple +
fused +  and free +
2 (?) +  and 3 (?) +
dome--shaped +  and triangular +
Gramineae +
Panicum hemitomon +
Panicum sect. Hemitonia +
species +
membranous +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
pubescent +  and glabrous +
rugose +  and verrucose +
chartaceous-indurate +  and rigid +
aquatic +  and terrestrial +
semiaquatic +  and aquatic +
dioecious +, monoecious +  and synoecious +