Eragrostis airoides
Eragrostis lugens
darnel lovegrass
mourning lovegrass
30-110 cm, erect, glabrous below the nodes.
30-70 cm, erect, sometimes geniculate, glabrous below the nodes.
glabrous or pilose, hairs to 5 mm;
ligules 0.1-0.2 mm;
blades 8-22 mm long, (1)2-4(5) mm wide, flat to folded, glabrous abaxially, scabridulous adaxially.
usually mostly glabrous, summits hairy, hairs 2-5 mm, never papillose-based;
ligules 0.2-0.3 mm;
blades (4)8-22 cm long, 1-3.5 mm wide, involute to flat, both surfaces glabrous, margins sometimes with scattered hairs, hairs to 7 mm.
18-70 cm long, 3-25 cm wide, diffuse, ovate;
primary branches 4-20 cm, appressed or diverging 10-70° from the rachises, naked basally;
pulvini glabrous;
pedicels 2.4-11 mm, divergent.
16-28 cm long, 10-21 cm wide, ovate, open;
primary branches 0.6-15 cm, diverging up to 100° from the rachises, naked basally;
pulvini hairy;
pedicels 1.4-5(7) mm, diverging, wiry, present on all spikelets.
1.3-2 mm long, 0.8-1.8 mm wide, ovate to lanceolate, plumbeous, with 1-3 florets;
disarticulation acropetal, in the rachilla below the florets, glumes deciduous;
rachilla prolonged above the terminal floret.
2-4.5(5) mm long, 0.5-1(1.3) mm wide, narrowly lanceolate, plumbeous to reddish-purple, with 2-7 florets;
disarticulation acropetal, paleas persistent.
lanceolate to ovate, membranous;
lower glumes 0.8-1 mm;
upper glumes 1.1-1.4 mm;
lemmas 0.8-1.2 mm, ovate, membranous, plumbeous, keels and lateral veins inconspicuous, apices obtuse;
paleas 0.8-1.2 mm, membranous, bases not projecting beyond the lemmas, apices obtuse;
anthers 3, 0.3-0.5 mm, purplish.
broadly ovate to narrowly lanceolate, hyaline, sometimes reddish-purple;
lower glumes 0.6-1 mm;
upper glumes 1.1-1.4 mm, usually broader than the lower glumes;
lemmas 1.2-1.8 mm, broadly ovate, mostly membranous but the distal margins hyaline, lateral veins inconspicuous, apices acute;
paleas 1.1-1.7 mm, membranous to hyaline, apices obtuse;
anthers 3, 0.2-0.7 mm, reddish-purple.
0.4-0.5 mm, ovoid, reticulate, reddish-brown.
0.5-0.6 mm, obovoid to somewhat prism-shaped, terete to somewhat laterally compressed, sometimes with a weak adaxial groove, finely striate, usually opaque, faintly reddish-brown to whitish.
.).
= 36 (Davidse, pers.
= 40, 80, ca. 108.
Eragrostis airoides
Eragrostis lugens
Eragrostis airoides is a South American species that, in the Flora region, is known only from roadsides and disturbed sites in Brazos County, Texas. It is an enigmatic species, often treated as Sporobolus brasiliensis (Raddi) Hack., which it resembles in its chromosome base number of x = 9 and caryopsis morphology, but its frequent possession of spikelets with more than 1 floret and its mode of spikelet disarticulation argue for its retention in Eragrostis.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Eragrostis lugens grows on sandy dunes and along river banks, at 1-300 m. Its range extends from the southern United States to Peru and Argentina.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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