Flora of North America species comparison

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Eragrostis airoides

Eragrostis elongata

darnel lovegrass

long lovegrass
Habit Plants perennial; cespitose, with innovations, without rhizomes, not glandular. Plants perennial; cespitose, with innovations, without rhizomes, not glandular.
Culms

30-110 cm, erect, glabrous below the nodes.

28-60 cm, erect to decumbent, glabrous below the nodes.
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.

glabrous, apices sparsely hairy, hairs to 2 mm;

ligules 0.3-0.4 mm;

blades 5-20 cm long, 0.8-3 mm wide, flat to involute, abaxial surfaces glabrous, adaxial surfaces scabridulous, occasionally hairy near the base.
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.

terminal, (5)8-20(22) cm long, 1-3.5 cm wide, spicate to narrowly ovate, branches condensed into glomerate lobes;

primary branches 0.8-3 cm, appressed or diverging up to 90° from the rachises, spikelet-bearing to the base;

pulvini glabrous;

pedicels 0.2-1.3 mm, flattened, mostly appressed, all shorter than the spikelets.
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.

3-7 mm long, 1.8-2.4 mm wide, linear-lanceolate, stramineous with a reddish-purple tinge, with 8-18 florets;

disarticulation acropetal, glumes first, then the lemmas, 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.

subequal, 1.2-2 mm, narrowly lanceolate to lanceolate, membranous;

lemmas 1.5-2.2 mm, lanceolate to ovate, leathery, greenish, lateral veins conspicuous, apices acute;

paleas 1.1-1.7 mm, hyaline, narrower than the lemmas, keels ciliate, cilia to 0.2 mm, apices obtuse to acute;

anthers 2, 0.2-0.3 mm, purplish.
Caryopses

0.4-0.5 mm, ovoid, reticulate, reddish-brown.

0.4-0.5 mm, ovoid, not grooved, smooth, light brown.
Comm

.).

2n

= 36 (Davidse, pers.

= unknown.

Eragrostis airoides

Eragrostis elongata
Distribution
from FNA
TX
[BONAP county map]
from FNA
FL; SC; HI
[BONAP county map]
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 elongata is native to southeastern Asia and Australia, where it grows in disturbed, sandy soils at 0-50 m. It was collected once near Washington, D.C., probably as an escape from the U.S. Department of Agriculture's experimental grass garden; it has not become established in the Flora region.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 25, p. 103. FNA vol. 25, p. 101.
Parent taxa Poaceae > subfam. Chloridoideae > tribe Cynodonteae > Eragrostis Poaceae > subfam. Chloridoideae > tribe Cynodonteae > Eragrostis
Sibling taxa
E. amabilis, E. atrovirens, E. bahiensis, E. barrelieri, E. capillaris, E. cilianensis, E. ciliaris, E. cumingii, E. curtipedicellata, E. curvula, E. cylindriflora, E. echinochloidea, E. elliottii, E. elongata, E. erosa, E. frankii, E. gangetica, E. hirsuta, E. hypnoides, E. intermedia, E. japonica, E. lehmanniana, E. lugens, E. lutescens, E. mexicana, E. minor, E. obtusiflora, E. palmeri, E. pectinacea, E. pilosa, E. plana, E. polytricha, E. prolifera, E. refracta, E. reptans, E. scaligera, E. secundiflora, E. sessilispica, E. setifolia, E. silveana, E. spectabilis, E. spicata, E. superba, E. swallenii, E. tef, E. trichodes, E. trichophora, E. unioloides
E. airoides, E. amabilis, E. atrovirens, E. bahiensis, E. barrelieri, E. capillaris, E. cilianensis, E. ciliaris, E. cumingii, E. curtipedicellata, E. curvula, E. cylindriflora, E. echinochloidea, E. elliottii, E. erosa, E. frankii, E. gangetica, E. hirsuta, E. hypnoides, E. intermedia, E. japonica, E. lehmanniana, E. lugens, E. lutescens, E. mexicana, E. minor, E. obtusiflora, E. palmeri, E. pectinacea, E. pilosa, E. plana, E. polytricha, E. prolifera, E. refracta, E. reptans, E. scaligera, E. secundiflora, E. sessilispica, E. setifolia, E. silveana, E. spectabilis, E. spicata, E. superba, E. swallenii, E. tef, E. trichodes, E. trichophora, E. unioloides
Synonyms E. diandra
Name authority Nees (Willd.) Jacq.
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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