Flora of North America species comparison

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Eragrostis airoides

Eragrostis erosa

darnel lovegrass

Chihuahua lovegrass, Chihuahuan 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.

70-110 cm, erect, 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.

hairy at the apices and sometimes on the upper margins, hairs to 4 mm, not papillose-based;

ligules 0.2-0.4 mm;

blades (8)12-30 cm long, 1.5-3.8 mm wide, flat to involute, abaxial surfaces glabrous, adaxial surfaces scabridulous, glabrous or sparsely hairy, hairs to 4 mm.
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.

25-45 cm long, (5)12-30 cm wide, broadly ovate, open;

primary branches mostly 4-20 cm, diverging 20-90° from the rachises, capillary, sinuous;

pulvini glabrous or hairy;

pedicels 1-18 mm, appressed or divergent, proximal spikelets on each branch usually with pedicels shorter than 5 mm.
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.

5-9 mm long, 1-3 mm wide, lanceolate, plumbeous, with 5-12 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.

lanceolate to ovate, membranous;

lower glumes 1.3-2.4 mm;

upper glumes 1.6-2.6 mm;

lemmas 2.4-3 mm, ovate, mostly membranous, hyaline near the margins and apices, lateral veins inconspicuous, apices acute;

paleas 1.5-3 mm, hyaline, narrower than the lemmas, apices obtuse to truncate;

anthers 3, 0.6-1.7 mm, purplish.
Caryopses

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

0.8-1.6 mm, subellipsoid, terete to somewhat laterally compressed, with a well-developed adaxial groove, faintly striate, opaque, reddish-brown.
Comm

.).

2n

= 36 (Davidse, pers.

= unknown.

Eragrostis airoides

Eragrostis erosa
Distribution
from FNA
TX
[BONAP county map]
from FNA
NM; TX
[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 erosa grows on rocky slopes and hills, at 1200-2300 m, often in association with Pinus edulis, Juniperus monosperma, and Bouteloua gracilis. Its range extends from New Mexico and western Texas to northern Mexico.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 25, p. 103. FNA vol. 25, p. 97.
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. elongata, 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
Name authority Nees Scribn. ex Beal
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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