familyPoaceae
subfamilyPoaceae subfam. Chloridoideae
tribePoaceae tribe Cynodonteae
genusErioneuron
speciesErioneuron avenaceum

Erioneuron avenaceum

(Kunth) Tateoka
Jesus Valdes-Reyna
Common names: Large-flowered tridens Shortleaf woolygrass
Synonyms: Tridens grandiflorus Erioneuron grandiflorum
Treatment appears in FNA Volume 25. Treatment on page 45.
Please click on the illustration for a higher resolution version.
Illustrator: Karen Klitz, Linda A. Vorobik

Copyright: Utah State University

Culms (7) 10-30 (40) cm tall, (0.4) 0.7-1 mm thick, glabrous; nodes glabrous or villous. Ligules to 0.5 mm; blades (1.5) 3-5 (8) cm long, (0.5) 1-1.5 (2.5) mm wide, both surfaces sparsely pilose. Panicles 2-8 (10) cm; branches with 2-10 (16) shortly pedicellate spikelets. Spikelets 6-8 (10) mm, purplish, with (4) 6-12 (20) florets; lower glumes 4-7 mm; upper glumes 6-9 mm, equaling or exceeding the lowest florets; lemmas 4-7 mm, purplish-green, awned from between the lobes, awns 2-4 mm, apices bilobed, lobes 1-2 mm, obtuse to acute; anthers 0.4-1 mm or (when monandrous) to 1.3 mm. Caryopses 1-1.4 mm. 2n = 16, 32.

Distribution

Ariz., N.Mex., Tex.

Discussion

Erioneuron avenaceum is common in rocky areas from the southwestern United States to central Mexico; it also grows in Bolivia and Argentina. North American plants belong to E. avenaceum (Kunth) Tateoka var. avenaceum. Stoloniferous plants occur in the Flora region, but they are most common in central Mexico.

Selected References

None.

Lower Taxa

None.

No values specified."decumbent" is not a number.

... more about "Erioneuron avenaceum"
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2n chromosome quantity
32 +  and 16 +
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 quantity
3 +  and 1 +
Apex architecture or shape
bilobed +
Apex shape
2-lobed +, toothed +, not sharp +  and acute +
Apical cell height or length or size
short +
Apical cell width
Wide (?) +
Arm cell anatomy
kranz +
Arm cell presence
absent +
Auricle presence
absent +
Author
Jesus Valdes-Reyna +
Authority
(Kunth) Tateoka +
Awn atypical quantity
1 (?) +  and 3 (?) +
Awn orientation
arising +
Awn quantity
multiple +, , +  and single +
Awn some measurement
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
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
3 cm30 mm <br />0.03 m <br /> (5 cm50 mm <br />0.05 m <br />) +
Blade position
adaxial +
Blade pubescence
pilose +
Blade shape
usually linear +  and lanceolate occasionally ovate +
Blade width
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
Branch quantity
1;many +
Branch shape
spikelike +
Caryopsis coloration or reflectance
translucent +
Caryopsis reflectance
glossy +
Caryopsis some measurement
0.1 cm1 mm <br />0.001 m <br /> (0.14 cm1.4 mm <br />0.0014 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 +
Common name
Large-flowered tridens +  and Shortleaf woolygrass +
Culm architecture
branched +
Culm architecture or arrangement or growth form
solitary +
Culm duration
annual +
Culm growth form
climbing +
Culm growth form or location
floating +
Culm height
10 cm100 mm <br />0.1 m <br /> (30 cm300 mm <br />0.3 m <br />) +
Culm orientation
erect +
Culm pubescence
glabrous +
Culm some measurement
6 cm60 mm <br />0.06 m <br /> (65 cm650 mm <br />0.65 m <br />) +
Culm texture
not woody +
Culm thickness
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
Distal floret architecture
staminate +
Distal floret reproduction
sterile +
Distal floret size
reduced +
Distribution
Ariz. +, N.Mex. +  and Tex. +
Embryo architecture or shape
cleft +
Embryo presence
absent +
Embryo quantity
/2 +  and 1 +
Embryo shape
not waisted +
Embryo size
large +
Endosperm texture
hard +
Filament shape
capillary +
Floret architecture
pistillate +  and staminate +
Floret arrangement
adjacent +
Floret atypical quantity
20 +  and 4 +
Floret height or length or size
shorter +
Floret length or size
sometimes longer +
Floret quantity
6 +  and 12 +
Floret reproduction
bisexual +  and fertile +
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 shape
acute +  and acuminate +
Glume texture
membranous +
Glume width
thin +
Group quantity
3 +
Hair quantity
lacking +
Hair relief
coarse +
Hair shape
uncinate +
Hair some measurement
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Hilum arrangement or course or shape
linear +
Hilum coloration or relief
punctate +
Hilum height or length or size
short +
Illustration
Present +
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 +
Intercostal region pubescence
pilose +
Internode architecture
hollow +  and solid +
Internode shape
elongate +
Keel architecture or pubescence or shape
ciliate +
Lateral-vein size
extended +
Layer presence
not absent +
Leaf arrangement
distichous +
Leaf margin arrangement
Overlapping (?) +
Leaf position
basal +
Lemma architecture
3-veined +
Lemma architecture or shape
awned +
Lemma coloration
purplish-green +
Lemma shape
rounded +
Lemma some measurement
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
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 />) +
Lobe shape
obtuse +  and acute +
Lobe some measurement
? (?) +
Lodicule fusion
adnate +
Lodicule presence
absent +
Lodicule prominence
inconspicuous +
Lodicule quantity
2 +
Lower glume some measurement
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
Margin coloration
white +  and hyaline +
Margin pubescence or texture
cartilaginous +
Marginal hair arrangement
adjacent +
Marginal hair fragility
stiff +
Marginal hair relief
coarse +
Microhair presence
absent +
Midrib architecture
simple +
Midvein size
extended +
Mucro size
small +
Node prominence
concealed +  and prominent +
Node pubescence
villous +  and glabrous +
Number of lower taxa
0 +
Other quantity
2 +  and 1 +
Ovary pubescence
glabrous +
Palea height or length or size
shorter +
Palea shape
keeled +
Panicle architecture
simple +
Panicle atypical some measurement
10 cm100 mm <br />0.1 m <br /> (?) +
Panicle branch height or length or size
short +
Panicle position
exserted +
Panicle some measurement
2 cm20 mm <br />0.02 m <br /> (8 cm80 mm <br />0.08 m <br />) +
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 +
Sheath architecture
open +
Sheath architecture or pubescence or relief
smooth +
Sheath coloration or pubescence or relief
striate +
Sheath condition
closed +
Sheath pubescence
glabrous +
Source xml
https://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V25/V25 71.xml +
Spikelet architecture
pedicellate +
Spikelet architecture or arrangement or growth form
solitary +
Spikelet atypical quantity
16 (?) +
Spikelet atypical some measurement
10 +
Spikelet coloration
purplish +
Spikelet fixation
attached +
Spikelet position or shape
distal +
Spikelet presence
absent +
Spikelet quantity
2 +  and 10 +
Spikelet reproduction
sterile +
Spikelet shape
compressed +
Spikelet some measurement
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 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
pilose +
Synonyms
Tridens grandiflorus +  and Erioneuron grandiflorum +
Taxon architecture
staminate +
Taxon family
Poaceae +
Taxon name
Erioneuron avenaceum +
Taxon parent
Erioneuron +
Taxon rank
species +
Taxon reproduction
dioecious +
Tissue coloration
hyaline +
Tissue texture
membranous +
Upper glume some measurement
0.6 cm6 mm <br />0.006 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
Upper glume variability
exceeding the lowest florets +  and equaling +
Vein presence
absent +
Vein pubescence
pilose +
Vein quantity
7 (?) +  and 13 (?) +
Vein size
major +
Volume
Volume 25 +
Whole organism architecture
stoloniferous +
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
8 +