Eragrostis mexicana |
Eragrostis bahiensis |
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giant helleborine, Mexican love grass, Orcutt's lovegrass |
bahia lovegrass |
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Habit | Plants annual; cespitose, without innovations. | Plants perennial; cespitose, with innovations, without rhizomes, not glandular. | ||||
Culms | 10-130 cm, erect, sometimes geniculate, glabrous, sometimes with a ring of glandular depressions below the nodes. |
25-95(110) cm, erect, glabrous. |
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Sheaths | sometimes with glandular pits, pilose near the apices and on the collars, hairs to 4 mm, papillose-based; ligules 0.2-0.5 mm, ciliate; blades 5-25 cm long, 2-7(9) mm wide, flat, abaxial surfaces glabrous, adaxial surfaces scabridulous, occasionally pubescent near the base. |
glabrous, summits hairy, hairs 1-3 mm; ligules 0.2-0.4 mm; blades (8)12-40 cm long, 2-5 mm wide, flat to involute, abaxial surfaces glabrous, adaxial surfaces scabridulous and glabrous or long ciliate basally. |
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Panicles | (5)10-40 cm long, (2)4-18 cm wide, ovate, rachises angled and channeled; primary branches 3-12(15) cm, solitary to whorled, appressed or diverging to 80° from the rachises; secondary branches somewhat appressed; pulvini glabrous; pedicels 1-6(7) mm, almost appressed to narrowly divergent, stiff. |
terminal, 15-30(45) cm long, (4)8-17 cm wide, narrowly ovate, open to contracted; primary branches 5-15 cm, diverging 20-90° from the rachises, often capillary, usually naked basally; pulvini glabrous; pedicels 0.3-6 mm, mostly appressed, scabridulous, always shorter than the spikelets. |
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Spikelets | (4)5-10(11) mm long, 0.7-2.4 mm wide, ovate to linear-lanceolate, gray-green to purplish, with 5-11(15) florets; disarticulation acropetal. |
6-15(18) mm long, 1.3-2(2.2) mm wide, narrowly lanceolate, plumbeous, occasionally with a reddish-purple tinge, with 8-30(40) florets; disarticulation usually in the rachilla below the florets, occasionally the lemmas falling separately, leaving the paleas on the rachilla. |
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Glumes | subequal, 0.7-2(2.3) mm, ovate to lanceolate, membranous; lemmas 1.2-2.4 mm, ovate, membranous, glabrous or with a few hairs, gray-green, lateral veins evident, often greenish, apices acute; paleas 1-2.2 mm, hyaline, keels scabrous, apices obtuse to truncate; anthers 3, 0.2-0.5 mm, purplish. |
lanceolate to ovate, membranous to subhyaline, keeled; lower glumes 1-1.4 mm; upper glumes 1.4-1.7 mm; lemmas 1.5-2.2 mm, broadly ovate, leathery, scabridulous, lateral veins evident, apices acute; paleas 1.4-2.1 mm, hyaline, bases not projecting beyond the lemmas, keels scabridulous, apices acute to obtuse; anthers 2, 0.4-0.6 mm, reddish-purple. |
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Caryopses | 0.5-0.8(1) mm, ovoid to rectangular-prismatic, laterally compressed, shallowly to deeply grooved on the adaxial surface, striate, reddish-brown, distal 2/3 opaque. |
0.6-0.8 mm, obovoid to ellipsoid, terete, somewhat striate, reddish-brown. |
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2n | = 60. |
= unknown. |
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Eragrostis mexicana |
Eragrostis bahiensis |
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Distribution |
AZ; CA; CO; DE; FL; IA; ID; IL; IN; MA; MD; ME; ND; NM; NV; OR; SC; TX; UT; WA; WI; BC; ON
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AL; FL; GA; LA; NJ; SC |
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Discussion | Eragrostis mexicana grows along roadsides, near cultivated fields, and in disturbed open areas, at 100-3000 m. It is native to the Americas, its native range extending from the southwestern United States through Mexico, Central and northern South America, to Argentina. Within the Flora region, it has been introduced beyond its native range, often becoming an established part of the flora. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Eragrostis bahiensis grows in sandy soils near river banks, lake shores, and roadsides, at 0-200 m. Its range extends south from the Gulf Coast of the United States through Mexico to Peru, Bolivia, Paraguay, and Argentina. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 25, p. 78. | FNA vol. 25, p. 101. | ||||
Parent taxa | Poaceae > subfam. Chloridoideae > tribe Cynodonteae > Eragrostis | Poaceae > subfam. Chloridoideae > tribe Cynodonteae > Eragrostis | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Name authority | (Hornem.) Link | (Schrad.) Schult. | ||||
Web links |
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