Eragrostis airoides |
Eragrostis barrelieri |
|
---|---|---|
darnel lovegrass |
Mediterranean love grass |
|
Habit | Plants perennial; cespitose, with innovations, without rhizomes, not glandular. | Plants annual; tufted, without innovations. |
Culms | 30-110 cm, erect, glabrous below the nodes. |
(5)10-60 cm, erect or decumbent, much-branched near the base, with a ring of glandular tissue below the nodes, rings often shiny or yellowish. |
Sheaths | 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 at the apices, hairs to 4 mm; ligules 0.2-0.5 mm, ciliate; blades 1.5-10 cm long, 1-3(5) mm wide, flat, abaxial surfaces glabrous, adaxial surfaces glabrous, sometimes scabridulous, occasionally with white hairs to 3 mm, margins without crateriform glands. |
Panicles | 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. |
4-20 cm long, 2.2-8(10) cm wide, ovate, open to contracted, rachises with shiny or yellowish glandular spots or rings below the nodes; primary branches 0.5-6 cm, diverging 20-100° from the rachises; pulvini glabrous; pedicels 1-4 mm, stout, stiff, divergent, without glandular bands. |
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. |
4-7(11) mm long, 1.1-2.2 mm wide, narrowly ovate, reddish-purple to greenish, occasionally grayish, with 7-12(20) florets; disarticulation acropetal, paleas persistent. |
Glumes | 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, membranous, 1-veined; lower glumes 0.9-1.4 mm; upper glumes 1.2-1.6 mm; lemmas 1.4-1.8 mm, broadly ovate, membranous, apices acute to obtuse; paleas 1.3-1.7 mm, hyaline, keels scabrous, scabridities to 0.1 mm, apices obtuse to acute; anthers 3, 0.1-0.2 mm, reddish-brown. |
Caryopses | 0.4-0.5 mm, ovoid, reticulate, reddish-brown. |
0.4-0.7 mm, ellipsoid, not grooved, smooth to faintly striate, light brown. |
Comm | .). |
|
2n | = 36 (Davidse, pers. |
= 40. |
Eragrostis airoides |
Eragrostis barrelieri |
|
Distribution |
TX |
AL; AZ; CA; CO; FL; KS; LA; MA; MD; MO; NE; NM; NV; OK; SC; TN; TX; UT; PR; Virgin Islands
|
Discussion | 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 barrelieri is a European species that is now naturalized in the Flora region, primarily in the south-western United States. It grows on gravelly roadsides, in gardens, and other disturbed, sandy sites, especially near railroad yards, at 10-2000 m. The ring of glandular tissue is most conspicuous below the upper cauline nodes. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 25, p. 103. | FNA vol. 25, p. 83. |
Parent taxa | Poaceae > subfam. Chloridoideae > tribe Cynodonteae > Eragrostis | Poaceae > subfam. Chloridoideae > tribe Cynodonteae > Eragrostis |
Sibling taxa | ||
Name authority | Nees | Daveau |
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