Eragrostis lutescens

Scribn.
Common names: Sixweeks lovegrass
Endemic
Treatment appears in FNA Volume 25. Treatment on page 79.

Plants annual; tufted, without innovations. Culms (2) 6-25 cm, usually erect, sometimes decumbent, glabrous, with elliptical, yellowish, glandular pits below the nodes. Sheaths 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. Panicles 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. Spikelets 3.6-7.5 mm long, 1.2-2 mm wide, narrowly ovate, light yellowish, occasionally mottled with red¬dish-purple, with 6-11 (14) florets; disarticulation acropetal, paleas persistent. Glumes 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 conspicu¬ous, apices acute; paleas 1.2-2 mm, hyaline, keels scabridulous, apices obtuse; anthers 3, 0.2-0.3 mm, purplish. Caryopses 0.5-0.8 mm, pyriform except slightly flattened adaxially, smooth, light-brown. 2n = unknown.

Distribution

Colo., N.Mex., Wash., Calif., Oreg., Ariz., Idaho, Nev.

Discussion

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.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Eragrostis lutescens"
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
Obtuse (?) +  and Acute (?) +
Paul M. Peterson +
Scribn. +
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 +
2 cm20 mm <br />0.02 m <br /> (12 cm120 mm <br />0.12 m <br />) +
pubescent +  and glabrous +
flat +  and involute +
1mm;3mm +
not disarticulating +
not spikelike +
pubescent +  and glabrous +
flattened +  and pyriform +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
triangular +  and dome--shaped +
sometimes longer +
membranous +
Sixweeks lovegrass +
branched +, simple +  and rooting +
geniculate +
6 cm60 mm <br />0.06 m <br /> (25 cm250 mm <br />0.25 m <br />) +
not woody +
Colo. +, N.Mex. +, Wash. +, Calif. +, Oreg. +, Ariz. +, Idaho +  and Nev. +
not waisted +
capillary +
pistillate +  and staminate +
sometimes longer +
6 +  and 11 +
round +  and compressed +
reduced +
persistent +  and deciduous +
shorter or longer +
subtending +
ovate +  and lanceolate +
subequal +
uncinate +
0 cm0 mm <br />0 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
paniculate +  and racemose +
hollow +  and solid +
scabridulous +
not absent +
(1)3(5)-veined +
stramineous +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.22 cm2.2 mm <br />0.0022 m <br />) +
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 +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
concealed +  and prominent +
2 +  and 1 +
persistent +
2-keeled +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
open +  and simple +
4cm +  and 10cm +
0.5 cm5 mm <br />0.005 m <br /> (2 cm20 mm <br />0.02 m <br />) +
0.14 cm1.4 mm <br />0.0014 m <br /> (1 cm10 mm <br />0.01 m <br />) +
dry +  and fleshy +
spikelike +
mottled with red +  and light yellowish +
0.36 cm3.6 mm <br />0.0036 m <br /> (0.75 cm7.5 mm <br />0.0075 m <br />) +
1 +  and 60 +
1.2mm +  and 2mm +
1 (?) +  and 3 (?) +
compound +  and simple +
2 (?) +  and 3 (?) +
Gramineae +
Eragrostis lutescens +
Eragrostis +
species +
membranous +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
7 +  and 13 +
rhizomatous +  and stoloniferous +
aquatic +  and terrestrial +
dioecious +  and synoecious +