Eragrostis airoides |
Eragrostis pectinacea |
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darnel lovegrass |
eragrostide pecttnee, tuft love grass |
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Habit | Plants perennial; cespitose, with innovations, without rhizomes, not glandular. | Plants annual; tufted, without innovations, without glandular pits. | ||||||||
Culms | 30-110 cm, erect, glabrous below the nodes. |
10-80 cm, erect to geniculate or decumbent below, glabrous. |
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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. |
hirsute at the apices, hairs to 4 mm; ligules 0.2-0.5 mm; blades 2-20 cm long, 1-4.5 mm wide, flat to involute, abaxial surfaces glabrous and smooth, adaxial surfaces scabridulous. |
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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. |
5-25 cm long, 3-12(15) cm wide, ovoid to pyramidal, usually open, sometimes contracted; primary branches 0.6-8.5 cm, appressed or diverging to 80° from the rachises, solitary or paired at the lowest 2 nodes; pulvini glabrous or sparsely hairy; pedicels 1-7 mm, flexible, appressed to widely divergent, sometimes capillary. |
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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. |
3.5-11 mm long, 1.2-2.5 mm wide, linear-oblong to narrowly lanceolate, plumbeous, yellowish-brown, or dark reddish-purple, with 6-22 florets; disarticulation acropetal, paleas persistent. |
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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. |
subulate to ovate-lanceolate, hyaline; lower glumes 0.5-1.5 mm, at least 1/2 as long as the adjacent lemmas; upper glumes 1-1.7 mm, usually broader than the lower glumes; lemmas 1-2.2 mm, ovate-lanceolate, hyaline to membranous, grayish-green proximally, reddish-purple distally, lateral veins moderately conspicuous, apices acute; paleas 1-2 mm, hyaline to membranous, keels scabridulous, apices obtuse; anthers 3, 0.2-0.7 mm, purplish. |
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Caryopses | 0.4-0.5 mm, ovoid, reticulate, reddish-brown. |
0.5-1.1 mm, pyriform, slightly laterally compressed, smooth, faintly striate, brownish. |
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Comm | .). |
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2n | = 36 (Davidse, pers. |
= 60. |
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Eragrostis airoides |
Eragrostis pectinacea |
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Distribution |
TX |
AL; AR; AZ; CA; CO; CT; DC; DE; FL; GA; IA; ID; IL; IN; KS; KY; LA; MA; MD; ME; MI; MN; MO; MS; MT; NC; ND; NE; NH; NJ; NM; NV; NY; OH; OK; OR; PA; RI; SC; SD; TN; TX; UT; VA; VT; WA; WI; WV; WY; HI; PR; BC; NB; NS; ON; QC; Virgin Islands
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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 pectinacea is native from southern Canada to Argentina. In the Flora region, it grows in disturbed sites such as roadsides, railroad embankments, gardens, and cultivated fields, at 0-1200 m. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 25, p. 103. | FNA vol. 25, p. 81. | ||||||||
Parent taxa | Poaceae > subfam. Chloridoideae > tribe Cynodonteae > Eragrostis | Poaceae > subfam. Chloridoideae > tribe Cynodonteae > Eragrostis | ||||||||
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Subordinate taxa | ||||||||||
Name authority | Nees | (Michx.) Nees | ||||||||
Web links |
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