Eragrostis capillaris

(L.) Nees
Common names: Lacegrass
Treatment appears in FNA Volume 25. Treatment on page 79.

Plants annual; tufted, without innovations, without glands. Culms (15) 20-50 (60) cm, erect, glabrous, often shiny below the nodes. Sheaths pilose along the margins, apices hirsute, hairs to 7 mm; ligules 0.2-0.5 mm, ciliate; blades (6) 8-20 (30) cm long, (1) 2-5 mm wide, flat, abaxial surfaces smooth, glabrous, adaxial surfaces scabridulous, with long scattered hairs. Panicles (10) 15-45 (55) cm long, (7) 10-25 cm wide, to 2/3 the height of the plants, elliptic to ovate, open, rachises without glandular pits; primary branches (2) 5-15 cm, diverging 20-90° from the rachises, capillary, naked basally; pulvini glabrous; pedicels (4) 5-25 mm, divergent, scabridulous. Spikelets (1.4) 2-5 mm long, 1-1.3 (1.4) mm wide, ovate to lanceolate, plumbeous, occasionally reddish-purple, with 2-5 (7) florets; disarticulation acropetal, paleas persistent. Glumes narrowly lanceolate to lanceolate, hyaline; lower glumes 1-1.2 mm, narrower than the upper glumes; upper glumes 1.2-1.4 mm; lemmas 1.2-1.7 mm, broadly ovate, membranous, keels scabridulous, lateral-veins inconspicuous, apices acute; paleas 1.2-1.6 mm, hyaline, keels almost smooth to scabrous, scabridities to 0.1 mm, apices acute to obtuse; anthers 3, 0.2-0.3 mm, reddish-brown. Caryopses 0.4-0.7 mm, ovoid to rectangular-prismatic, adaxial surfaces deeply grooved, striate, bases reddish-brown, distal 2/3 opaque. 2n = 50, 100.

Distribution

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

Discussion

Eragrostis capillaris is native to the eastern portion of the Flora region. It grows in open, dry, sandy river-banks, floodplains, rocky roadsides, and gravel pits, at 150-1500 m, usually in association with Pinus, Quercus, Carrya, and Liquidambar styraciflua. Its range extends into northeastern Mexico.

Eragrostis capillaris resembles E. frankii, but differs in its lack of glandular pits, deeply grooved caryopses, longer pedicels, pilose sheath margins, and larger panicles. The two species are sympatric over much of the eastern United States.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Eragrostis capillaris"
reddish-brown +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
Acute (?) +  and Obtuse (?) +
Paul M. Peterson +
(L.) Nees +
1 (?) +  and 3 (?) +
multiple +, , +  and single +
not +  and glabrous +
keeled +  and rounded +
pseudopetiolate +  and branching +
opaque +  and reddish-brown +
not fused +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
membranous +
not pseudopetiolate +
8 cm80 mm <br />0.08 m <br /> (20 cm200 mm <br />0.2 m <br />) +
pubescent +  and glabrous +
involute +, folded +  and flat +
2mm;5mm +
not disarticulating +
not spikelike +
pubescent +  and glabrous +
ovoid +  and rectangular-prismatic +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
triangular +  and dome--shaped +
sometimes longer +
membranous +
Lacegrass +
branched +, simple +  and rooting +
geniculate +
20 cm200 mm <br />0.2 m <br /> (50 cm500 mm <br />0.5 m <br />) +
not woody +
Conn. +, N.J. +, N.Y. +, W.Va. +, Del. +, D.C. +, Wis. +, Ont. +, Que. +, Fla. +, N.H. +, Tex. +, La. +, Tenn. +, N.C. +, S.C. +, Pa. +, Va. +, Mass. +, Maine +, R.I. +, Vt. +, Md. +, Calif. +, Ala. +, Ark. +, Ill. +, Ga. +, Ind. +, Iowa +, Kans. +, Nebr. +, Okla. +, Ohio +, Mo. +, Mich. +, Miss. +  and Ky. +
not waisted +
capillary +
pistillate +  and staminate +
sometimes longer +
2 +  and 5 +
round +  and compressed +
reduced +
persistent +  and deciduous +
shorter or longer +
subtending +
narrowly lanceolate +  and lanceolate +
uncinate +
0 cm0 mm <br />0 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
paniculate +  and racemose +
hollow +  and solid +
smooth to scabrous +
scabridulous +
not absent +
(1)3(5)-veined +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.17 cm1.7 mm <br />0.0017 m <br />) +
membranous +
sometimes longer +
ciliate +  and ciliolate +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
membranous +
inconspicuous +
0.1 cm1 mm <br />0.001 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
concealed +  and prominent +
2 +  and 1 +
persistent +
2-keeled +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.16 cm1.6 mm <br />0.0016 m <br />) +
15cm +  and 45cm +
0 +  and 2/3 +
10 cm100 mm <br />0.1 m <br /> (25 cm250 mm <br />0.25 m <br />) +
4 cm40 mm <br />0.04 m <br /> (?) +
scabridulous +
0.5 cm5 mm <br />0.005 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
dry +  and fleshy +
2 cm20 mm <br />0.02 m <br /> (?) +
5 cm50 mm <br />0.05 m <br /> (15 cm150 mm <br />0.15 m <br />) +
spikelike +
0 cm0 mm <br />0 m <br /> (0.01 cm0.1 mm <br />1.0e-4 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
1 +  and 60 +
ovate +  and lanceolate +
1mm +  and 1.3mm +
1 (?) +  and 3 (?) +
compound +  and simple +
2 (?) +  and 3 (?) +
Gramineae +
Eragrostis capillaris +
Eragrostis +
species +
membranous +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
7 +  and 13 +
rhizomatous +  and stoloniferous +
aquatic +  and terrestrial +
elliptic;ovate +
dioecious +  and synoecious +