familyPoaceae
subfamilyPoaceae subfam. Chloridoideae
tribePoaceae tribe Cynodonteae
genusEustachys
speciesEustachys retusa

Eustachys retusa

(Lag.) Kunth
Cynthia Aulbach
Introduced
Synonyms: Chloris argentina
Treatment appears in FNA Volume 25. Treatment on page 222.

Culms 30-80 cm, erect, or decumbent and rooting at the nodes. Blades 6-12 cm long, 5-10 mm wide, usually folded, apices obtuse. Panicles with (6) 8-15 branches; branches 4-10 cm, straight, somewhat stiff. Spikelets 1.5-2.1 mm; florets 2. 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. Caryopses about 1 mm. 2n = 40.

Distribution

Tex., N.Y., Ga., S.C., N.J., Fla.

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.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Eustachys retusa"
RDF feed
2n chromosome quantity
40 +
Abaxial ligule presence
absent +
Abaxial ligule quantity
common +
Adaxial cell presence
absent +
Adaxial cell shape
bulliform +
Adaxial cell structure in adjective form
stomatal +
Adaxial ligule architecture or pubescence or shape
ciliate +
Adaxial ligule length or size
longer +
Adaxial ligule presence
absent +
Adaxial ligule texture
membranous +
Anther coloration
purple +  and purple-red +
Anther quantity
3 +
Apex architecture or shape
truncate +  and bilobed +
Apex coloration
white +
Apex orientation
spreading +
Apex shape
acute +  and mucronate +
Apex some measurement
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Apical cell height or length or size
short +
Apical cell width
Wide (?) +
Arm cell anatomy
kranz +
Arm cell presence
absent +
Auricle presence
absent +
Author
Cynthia Aulbach +
Authority
(Lag.) Kunth +
Awn atypical quantity
1 (?) +  and 3 (?) +
Awn orientation
arising +
Awn quantity
single +
Awn some measurement
0 cm0 mm <br />0 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
Axis shape
triquetrous +
Back shape
keeled +  and rounded +
Base architecture
pseudopetiolate +  and branching +
Base arrangement
close +
Base fusion
not fused +
Base position
intravaginal +, extravaginal +, branching +  and basal +
Base size
swelling +
Base texture
membranous +
Base width
thick +
Blade architecture
not pseudopetiolate +
Blade architecture or arrangement
radiate +
Blade architecture or shape
folded +
Blade length
6 cm60 mm <br />0.06 m <br /> (12 cm120 mm <br />0.12 m <br />) +
Blade orientation
Erect (?) +  and Spreading (?) +
Blade position
adaxial +
Blade pubescence
pubescent +  and glabrous +
Blade shape
folded +  and flat +
Blade width
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Branch architecture
non-disarticulating +
Branch arrangement
arranged +
Branch atypical quantity
6 (?) +
Branch course
straight +
Branch fragility
stiff +
Branch quantity
8;15 +
Branch shape
spikelike +
Branch some measurement
4 cm40 mm <br />0.04 m <br /> (10 cm100 mm <br />0.1 m <br />) +
Caryopsis coloration
pale +  and slightly reddish-purple-tinged +
Caryopsis coloration or reflectance
translucent +
Caryopsis pubescence
glabrous +
Caryopsis shape
trigonous-ellipsoid +
Caryopsis some measurement
1 cm10 mm <br />0.01 m <br /> (?) +
Cell shape
triangular +  and dome--shaped +
Cilium architecture or pubescence or shape
ciliate +
Cilium length or size
sometimes longer +
Cilium texture
membranous +
Column quantity
single +
Culm architecture
rooting +
Culm architecture or arrangement or growth form
solitary +
Culm duration
annual +
Culm growth form
climbing +
Culm growth form or location
floating +
Culm orientation
decumbent +  and erect +
Culm pubescence
glabrous +
Culm shape
flattened +
Culm some measurement
30 cm300 mm <br />0.3 m <br /> (80 cm800 mm <br />0.8 m <br />) +
Culm texture
not woody +
Distal floret size
reduced +
Distribution
Tex. +, N.Y. +, Ga. +, S.C. +, N.J. +  and Fla. +
Embryo architecture or shape
cleft +
Embryo presence
absent +
Embryo shape
not waisted +
Embryo size
large +
Endosperm texture
hard +
Filament shape
capillary +
Floret architecture
stipitate +  and staminate +
Floret arrangement
adjacent +
Floret height or length or size
shorter +
Floret length or size
sometimes longer +
Floret presence
absent +
Floret prominence
rudimentary +
Floret quantity
2 +
Floret reproduction
sterile +
Floret shape
round +  and compressed +
Floret size
reduced +
Fusoid cell presence
absent +
Genus quantity
1 +
Glume architecture
1-veined +
Glume architecture or shape
awned +
Glume height or length or size
shorter +
Glume length or size
shorter or longer +
Glume position
subtending +
Glume quantity
2 +
Glume size
unequal +
Group quantity
3 +
Hair coloration
white +
Hair height or length or size
short +
Hair orientation
spreading +
Hair quantity
few +
Hair relief
coarse +
Hair shape
acute +  and mucronate +
Hair some measurement
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Hilum arrangement or course or shape
linear +
Hilum coloration or relief
punctate +
Hilum height or length or size
short +
Illustration copyright
Utah State University +
Illustrator
Linda A. Vorobik +  and Karen Klitz +
Inflorescence architecture
pistillate +
Inflorescence arrangement
paniculate +  and racemose +
Inflorescence fusion
distinct +
Inflorescence position
axillary +
Inflorescence position or structure subtype
terminal +
Internode architecture
hollow +
Internode shape
elongate +
Layer presence
not absent +
Leaf arrangement
distichous +
Leaf margin arrangement
Overlapping (?) +
Leaf position
cauline +  and basal +
Lemma architecture
empty +  and stipitate +
Lemma architecture or shape
awned +
Lemma shape
cuneate +
Lemma some measurement
0.11 cm1.1 mm <br />0.0011 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
Ligule architecture or pubescence or shape
ciliate +
Ligule height or length or size
short +
Ligule length or size
sometimes longer +
Ligule presence
absent +
Ligule some measurement
0 cm0 mm <br />0 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
Ligule texture
scarious +
Lodicule presence
absent +
Lodicule prominence
inconspicuous +
Lodicule quantity
2 +
Lower glume shape
acute +  and linear-lanceolate +
Lower glume size
somewhat smaller +
Lower glume size or width
narrow +
Lower glume some measurement
0.11 cm1.1 mm <br />0.0011 m <br /> (0.13 cm1.3 mm <br />0.0013 m <br />) +
Lowest floret reproduction
bisexual +
Lowest lemma architecture
3-veined +
Lowest lemma coloration
light +  and dark-brown +
Lowest lemma pubescence or texture
cartilaginous +
Lowest lemma relief
scabridulous +
Lowest lemma shape
keeled +, lanceolate +  and ovate +
Lowest lemma some measurement
0.17 cm1.7 mm <br />0.0017 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Marginal hair arrangement
adjacent +
Marginal hair fragility
stiff +
Marginal hair relief
coarse +
Microhair presence
absent +
Midrib architecture
simple +
Midvein pubescence
glabrous +
Mucro some measurement
0 cm0 mm <br />0 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
Node prominence
concealed +  and prominent +
Number of lower taxa
0 +
Other quantity
2 +  and 1 +
Ovary pubescence
glabrous +
Palea architecture
2-veined +
Palea height or length or size
slightly shorter +
Palea pubescence
glabrous +
Palea shape
keeled +
Palea variability
equaling +
Panicle architecture
simple +
Panicle branch height or length or size
short +
Pericarp architecture or fragility
loose +
Pericarp arrangement
separating +
Pericarp condition or texture
dry +
Pericarp fusion
free +
Pericarp texture
dry +  and fleshy +
Raceme shape
spikelike +
Rachis prominence
evident +
Reference
None +
Row quantity
2 +
Sheath architecture
open +
Sheath arrangement
equitant +  and distichous +
Sheath condition
closed +
Sheath shape
compressed +  and keeled +
Source xml
https://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V25/V25 818.xml +
Special status
Introduced +
Spikelet architecture
subsessile +  and sessile +
Spikelet architecture or arrangement or growth form
solitary +
Spikelet fixation
attached +
Spikelet orientation
Diverging (?) +
Spikelet position or shape
distal +
Spikelet presence
absent +
Spikelet quantity
1 +  and 60 +
Spikelet reproduction
sterile +
Spikelet shape
compressed +
Spikelet some measurement
0.15 cm1.5 mm <br />0.0015 m <br /> (0.21 cm2.1 mm <br />0.0021 m <br />) +
Stamen quantity
1 +  and 3 +
Starch-grain architecture
compound +  and simple +
Starch-grain presence
absent +
Style-branch atypical quantity
4 +  and 1 +
Style-branch quantity
2 (?) +  and 3 (?) +
Style arrangement
separate +
Style quantity
2 +
Surface pubescence
glabrous +
Surface relief
scabridulous +  and scabrous +
Synonyms
Chloris argentina +
Taxon architecture
staminate +
Taxon family
Poaceae +
Taxon name
Eustachys retusa +
Taxon parent
Eustachys +
Taxon rank
species +
Taxon reproduction
dioecious +
Tissue coloration
hyaline +
Tissue texture
membranous +
Upper glume coloration
purplish +, pale +  and green +
Upper glume pubescence
glabrous +
Upper glume shape
oblanceolate +
Upper glume some measurement
0.13 cm1.3 mm <br />0.0013 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
Upper glume texture
scarious +
Vein architecture or pubescence or shape
ciliate +
Vein presence
absent +
Vein pubescence or relief
scabrous +
Vein quantity
7 (?) +  and 13 (?) +
Vein relief
scabridulous +
Vein shape
keeled +
Vein size
major +
Volume
Volume 25 +
Whole organism architecture
stoloniferous +  and rhizomatous +
Whole organism arrangement or pubescence
tufted +
Whole organism duration
perennial +
Whole organism growth form
plant +  and cespitose +
Whole organism growth form or habitat
aquatic +  and terrestrial +
Whole organism reproduction
dioecious +, monoecious +  and synoecious +
Whole organism variability
varied +
X chromosome atypical quantity
12 +
X chromosome quantity
10 +