Flora of North America species comparison

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Eragrostis airoides

Eragrostis cumingii

darnel lovegrass

Cuming's lovegrass
Habit Plants perennial; cespitose, with innovations, without rhizomes, not glandular. Plants annual; cespitose, without innovations, without glands.
Culms

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

10-40(50) cm, erect to prostrate, sometimes geniculate, branching profusely from near the base, 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.

sparsely hairy at the apices, hairs to 2.5 mm;

ligules 0.1-0.2 mm;

blades 3-10(12) cm long, 1-3 mm wide, flat to involute, sparsely pilose on the basal 1/2, scabridulous distally.
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.

5-20 cm long, 2-8 cm wide, narrowly ovate, open, with 6-10 primary branches;

primary branches 1-6 cm, widely spaced, axes trigonous, diverging to 90° from the rachises, densely spikelet-bearing to the base;

pulvini sparsely pilose;

pedicels 0.4-1(2) mm, stout, straight, flattened.
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.

5-12(18) mm long, 1.4-2.4 mm wide, linear-lanceolate, chartaceous, stramineous to greenish with reddish-purple tinges, with 12-42 florets;

disarticulation acropetal.
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 in length, 1.2-1.9 mm, narrowly lanceolate to lanceolate, membranous;

lower glumes narrower than the upper glumes;

lemmas 1.3-2 mm, lanceolate to ovate, chartaceous, lateral veins conspicuous, greenish, apices acute;

paleas 1-1.6 mm, hyaline, keels ciliate, cilia 0.1-0.2 mm, apices obtuse to acute;

anthers 3, 0.1-0.2 mm, purplish.
Caryopses

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

0.4-0.6 mm, ovoid, laterally compressed, finely striate, light brown.
Comm

.).

2n

= 36 (Davidse, pers.

= 40.

Eragrostis airoides

Eragrostis cumingii
Distribution
from FNA
TX
[BONAP county map]
from FNA
AL; FL; GA; NC; NJ; 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 cumingii is native to southeast Asia and Australia. Within the Flora region, it has become established in Florida, growing in waste places and along roadsides in sandy or gravelly soils, at 0-150 m.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 25, p. 103. FNA vol. 25, p. 72.
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. 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
Synonyms E. broumii
Name authority Nees Steud.
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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