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Argentine fingergrass

Florida fingergrass, twospike fingergrass

Culms

30-80 cm, erect, or decumbent and rooting at the nodes.

50-100 cm, erect.

Blades

6-12 cm long, 5-10 mm wide, usually folded, apices obtuse.

to 30 cm long, to 8.2 mm wide, apices acute.

Panicles

with (6)8-15 branches;

branches 4-10 cm, straight, somewhat stiff.

with 1-3 branches;

branches 5-13 cm.

Spikelets

1.5-2.1 mm;

florets 2.

3-3.7 mm;

florets 3.

Lower glumes

1.1-1.3 mm, linear-lanceolate, acute;

upper glumes 1.3-1.5 mm, oblanceolate, apices truncate or bilobed, mucronate, mucros to 0.4 mm;

calluses with a few short hairs;

lowest lemmas 1.7-2 mm, lanceolate to ovate, not strongly keeled, midveins glabrous, lateral veins with widely spreading, white, 1-2 mm hairs, apices acute to mucronate;

second lemmas 1.1-1.2 mm, broadly cuneate, apices truncate.

1.8-2 mm, apices acute to obtuse;

upper glumes 2.2-3.1 mm, oblanceolate, truncate to occasionally bilobed, lobes obtuse, awned from between the lobes, awns 0.5-1 mm;

calluses with tufts of hairs, hairs to 0.6 mm;

lowest lemmas 2.9-3.7 mm, ovate, tan to light brown at maturity, lateral veins and keels with appressed, whitish to golden hairs, hairs to 0.7 mm, apices acute, awned, awns 0.4-0.6 mm, arising from just below the apices;

second lemmas 1.5-2.6 mm, obovate, acute, mucronate.

Caryopses

about 1 mm.

about 1.7 mm.

2n

= 40.

= unknown.

Eustachys retusa

Eustachys floridana

Distribution
from FNA
FL; GA; NJ; NY; SC; TX
[BONAP county map]
from FNA
AL; FL; GA
[WildflowerSearch map]
[BONAP county map]
Discussion

Eustachys retusa is native to South America, but it is now established along roadsides, sandy fields, and waste areas in the southeastern United States.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Eustachys floridana grows in dry, sandy woods and old fields. It is endemic to the southeastern United States.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 25, p. 222. FNA vol. 25, p. 222.
Parent taxa Poaceae > subfam. Chloridoideae > tribe Cynodonteae > Eustachys Poaceae > subfam. Chloridoideae > tribe Cynodonteae > Eustachys
Sibling taxa
E. caribaea, E. distichophylla, E. floridana, E. glauca, E. neglecta, E. petraea
E. caribaea, E. distichophylla, E. glauca, E. neglecta, E. petraea, E. retusa
Synonyms Chloris argentina Chloris floridana
Name authority (Lag.) Kunth Chapm.
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