Eragrostis airoides
Eragrostis spectabilis
darnel lovegrass
eragrostide brillante, purple love grass
30-110 cm, erect, glabrous below the nodes.
30-70(85) cm, erect, glabrous.
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.
hairy on the margins and at the apices, hairs to 7 mm;
ligules 0.1-0.2 mm;
blades 10-32 cm long, 3-8 mm wide, flat to involute, both surfaces usually pilose, sometimes glabrous on both surfaces or glabrous abaxially and sparsely pilose adaxially, often with a line of hairs behind the ligules, hairs to 8 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.
(15)25-45(60) cm long, 15-35 cm wide, broadly ovate to oblong, open, basal portions sometimes included in the uppermost leaf sheaths;
primary branches (6)12-20 cm long, diverging 20-90° from the rachises, capillary, naked below;
pulvini hairy, hairs to 6 mm;
pedicels 1.5-17 mm, divergent or appressed.
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.
3-7.5 mm long, 1-2 mm wide, linear-lanceolate, reddish-purple, sometimes olivaceous, with (4)6-12 florets;
disarticulation basipetal, glumes 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.
subequal to equal, (1)1.3-2.3 mm, lanceolate, membranous to chartaceous;
lemmas (1)1.3-2.5 mm, ovate to lanceolate, leathery, 3-veined, apices acute;
paleas (1)1.2-2.4 mm, membranous, keels sometimes shortly ciliate, apices obtuse to truncate;
anthers 3, 0.3-0.5 mm, purplish.
0.4-0.5 mm, ovoid, reticulate, reddish-brown.
0.6-0.8 mm, ellipsoid, strongly flattened, adaxial surfaces with 2 prominent ridges separated by a groove, reddish-brown.
.).
= 36 (Davidse, pers.
= 20, 40, 42.
Eragrostis airoides
Eragrostis spectabilis
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 spectabilis is native in the eastern portion of the Flora region, extending from southern Canada through the United States, Mexico, and Central America to Belize. It grows in fields and on the margins of woods, along roadsides, and in other disturbed sites, usually in sandy to clay loam soils, at 0-1830 m, and is associated with hardwood forests, Prosopsis-Acacia grasslands, and shortgrass prairies. A showy species, E. spectabilis is available commercially for planting as an ornamental.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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