Eragrostis japonica

(Thunb.) Trin.
Common names: Pond lovegrass
Synonyms: Eragrostis glomerata
Treatment appears in FNA Volume 25. Treatment on page 74.

Plants annual; cespitose, without innovations, without glands. Culms 25-100 (115) cm, erect or geniculate, lower portion glabrous and shiny. Sheaths glabrous at the apices and on the upper margins; ligules 0.4-0.6 mm, scarious, glabrous; blades (4) 15-20 (25) cm long, 1.5-6 mm wide, flat, sometimes auriculate, abaxial surfaces glabrous, smooth, adaxial surfaces scabridulous, Panicles 15-40 cm long, 0.8-5 cm wide, lanceoloid, contracted, interrupted near the base; primary branches 2-10 cm, appressed or diverging to 30° from the rachises, spikelet-bearing to near the base; pulvini glabrous; pedicels 0.5-1.5 mm, sinuous. Spikelets 2.2-3.8 mm long, 0.8-1.3 mm wide, oblong to narrowly lanceolate, yellowish-brown to whitish and hyaline, with 4-12 florets; disarticulation basipetal, rachillas and glumes persistent. Glumes subequal, 0.6-1 mm, ovate to ovatelanceolate, hyaline; upper glumes without a midvein; lemmas 0.9-1.2 mm, ovate, hyaline, lateral-veins conspicuous basally, greenish, apices acute; paleas 0.6-0.8 mm, hyaline, keels smooth basally, scabridulous distally, apices acute, often bifid; anthers 2, 0.1-0.2 mm, whitish to light-brown. Caryopses 0.3-0.4 mm, obovoid, smooth, reddish-brown. 2n = 20.

Distribution

Okla., Miss., Tex., La., Mo., Ala., Tenn., Ark., Ill., Ga., S.C., Fla.

Discussion

Eragrostis japonica is native to the tropics of the Eastern Hemisphere; it is now established in moist areas along rivers and streams in the southern portion of the contiguous United States, usually in sandy soils, at 0-200 m.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Eragrostis japonica"
whitish +  and light-brown +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
Paul M. Peterson +
(Thunb.) Trin. +
1 (?) +  and 3 (?) +
multiple +, , +  and single +
not +  and glabrous +
keeled +  and rounded +
pseudopetiolate +  and branching +
not fused +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
membranous +
not pseudopetiolate +
15 cm150 mm <br />0.15 m <br /> (20 cm200 mm <br />0.2 m <br />) +
pubescent +  and glabrous +
auriculate +
1.5mm;6mm +
not disarticulating +
not spikelike +
pubescent +  and glabrous +
reddish-brown +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
triangular +  and dome--shaped +
sometimes longer +
membranous +
Pond lovegrass +
branched +, simple +  and rooting +
geniculate +
25 cm250 mm <br />0.25 m <br /> (100 cm1,000 mm <br />1 m <br />) +
not woody +
Okla. +, Miss. +, Tex. +, La. +, Mo. +, Ala. +, Tenn. +, Ark. +, Ill. +, Ga. +, S.C. +  and Fla. +
not waisted +
capillary +
pistillate +  and staminate +
sometimes longer +
4 +  and 12 +
round +  and compressed +
reduced +
persistent +
shorter or longer +
subtending +
ovate +  and ovatelanceolate +
subequal +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
uncinate +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
paniculate +  and racemose +
hollow +  and solid +
scabridulous +
not absent +
(1)3(5)-veined +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
sometimes longer +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
inconspicuous +
concealed +  and prominent +
2 +  and 1 +
persistent +
2-keeled +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
15cm +  and 40cm +
lanceoloid +
0.8 cm8 mm <br />0.008 m <br /> (5 cm50 mm <br />0.05 m <br />) +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
dry +  and fleshy +
diverging;appressed +
2 cm20 mm <br />0.02 m <br /> (10 cm100 mm <br />0.1 m <br />) +
spikelike +
yellowish-brown +  and whitish and hyaline +
0.22 cm2.2 mm <br />0.0022 m <br /> (0.38 cm3.8 mm <br />0.0038 m <br />) +
1 +  and 60 +
oblong +  and narrowly lanceolate +
0.8mm +  and 1.3mm +
1 (?) +  and 3 (?) +
compound +  and simple +
2 (?) +  and 3 (?) +
Eragrostis glomerata +
Eragrostis japonica +
Eragrostis +
species +
membranous +
7 +  and 13 +
rhizomatous +  and stoloniferous +
plant +  and cespitose +
aquatic +  and terrestrial +
dioecious +  and synoecious +