Eragrostis intermedia
Eragrostis lutescens
plains lovegrass
six-weeks love grass
(30)40-90(110) cm, erect, glabrous below the nodes.
(2)6-25 cm, usually erect, sometimes decumbent, glabrous, with elliptical, yellowish, glandular pits below the nodes.
sparsely pilose on the margins, apices hairy, hairs to 8 mm, not papillose-based;
ligules 0.2-0.4 mm;
blades (4)10-20(30) cm long, 1-3 mm wide, flat or involute, abaxial surfaces glabrous, adaxial surfaces densely hairy behind the ligules, elsewhere usually glabrous, occasionally sparsely hairy.
with elliptical glandular pits, sparsely hairy at the throat, hairs to 2 mm;
ligules 0.2-0.5 mm, ciliate;
blades 2-12 cm long, 1-3 mm wide, flat to involute, abaxial surfaces scabridulous, bases with glandular pits.
15-40 cm long, (8.5)15-30 cm wide, ovate, open;
primary branches 4-25 cm, diverging 20-90° from the rachises, capillary;
pulvini hairy or glabrous;
pedicels 2-14 mm, divergent.
terminal, 4-10(15) cm long, 0.5-2 cm wide, narrowly elliptic, contracted, dense;
primary branches alternate, usually appressed, occasionally diverging to 30° from the rachises, rachises and branches with glandular pits;
pulvini glabrous;
pedicels 1.4-10 mm, appressed or divergent.
3-7 mm long, 1-1.8 mm wide, narrowly lanceolate, olivaceous to purplish, with (3)5-11 florets;
disarticulation acropetal, paleas persistent.
3.6-7.5 mm long, 1.2-2 mm wide, narrowly ovate, light yellowish, occasionally mottled with reddish-purple, with 6-11(14) florets;
disarticulation acropetal, paleas persistent.
lanceolate to ovate, hyaline to membranous;
lower glumes 1.1-1.7 mm, narrower than the upper glumes;
upper glumes 1.3-2 mm, apices acuminate to acute;
lemmas 1.6-2.2 mm, ovate, membranous, hyaline near the margins, lateral veins inconspicuous, apices acute;
paleas 1.4-2.1 mm, hyaline, narrower than the lemmas, apices obtuse to acute;
anthers 3, 0.5-0.8 mm, purplish.
subequal, ovate to lanceolate, hyaline;
lower glumes (0.7)0.9-1.4 mm;
upper glumes 1.2-1.8 mm;
lemmas 1.5-2.2 mm, ovate, subhyaline, stramineous, veins greenish and conspicuous, apices acute;
paleas 1.2-2 mm, hyaline, keels scabridulous, apices obtuse;
anthers 3, 0.2-0.3 mm, purplish.
0.5-0.9 mm, rectangular-prismatic, somewhat laterally compressed, with a well-developed adaxial groove, striate, opaque, reddish-brown.
0.5-0.8 mm, pyriform except slightly flattened adaxially, smooth, light brown.
= ca. 54, 60, 72, ca. 74, 80, 100, 120.
= unknown.
Eragrostis intermedia
Eragrostis lutescens
Eragrostis intermedia grows in clay, sandy, and rocky soils, often in disturbed sites, at 0-1850 m. Its range extends from the United States through Mexico and Central America to South America. Eragrostis intermedia is similar to the more widespread E. lugens, but differs from that species in having wider spikelets, longer lemmas, and caryopses with a prominent adaxial groove.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Eragrostis lutescens grows on the sandy banks of streams and lakes and in moist alkaline flats of the western United States at 300-2000 m. It has not been reported from Mexico.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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