familyPoaceae
subfamilyPoaceae subfam. Pooideae
tribePoaceae tribe Triticeae
genus×elyhordeum
species×elyhordeum arcuatum

×elyhordeum arcuatum

W.W. Mitch. & H.J. Hodgs.
Mary E. Barkworth
Treatment appears in FNA Volume 24. Treatment on page 286.

Culms 40-85 cm. Blades 7-22 cm long, 3-10 mm wide, abaxial surfaces scabrous, adaxial surfaces pilose. Inflorescences spikelike, 6-15 cm, arcuate to nodding, with 3 spikelets per node; central spikelets sessile, with 1-3 florets; lateral spikelets shortly pedicellate, with 0-2 florets. Glumes to 25 mm, awnlike, scabrous; lemmas 9-11 mm, scabrous, awned, awns to 25 mm, arcuate and divergent at maturity; anthers 1-1.4 mm. 2n = 28.

Distribution

Alaska

Discussion

×Elyhordeum arcuatum is probably a hybrid between Elymus sibiricus and Hordeum jubatum (Mitchell and Hodgson 1965). It was described from disturbed sites around Palmer, Alaska, from which it has since been eliminated. No additional reports are known. There is no illustration because the type specimens could not be located.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "×elyhordeum arcuatum"
RDF feed
2n chromosome quantity
28 +
Abaxial ligule presence
absent +
Abaxial ligule quantity
common +
Abaxial surface pubescence or relief
scabrous +
Adaxial cell presence
absent +
Adaxial cell shape
bulliform +
Adaxial ligule architecture or pubescence or shape
ciliate +
Adaxial ligule presence
absent +
Adaxial ligule texture
membranous +  and scarious +
Adaxial surface pubescence
pilose +
Anther quantity
3 +
Anther some measurement
0.1 cm1 mm <br />0.001 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
Apex architecture or shape
awned +
Apex pubescence
hairy +
Apex shape
toothed +, lobed +  and entire +
Arm cell presence
absent +
Auricle presence
absent +
Author
Mary E. Barkworth +
Authority
W.W. Mitch. & H.J. Hodgs. +
Awn architecture
unbranched +
Awn arrangement
divergent +
Awn atypical quantity
1 (?) +  and 3 (?) +
Awn course or shape
arcuate +
Awn orientation
arising +
Awn position
basal +  and apical +
Awn position or structure subtype
terminal +
Awn quantity
single +
Awn some measurement
0 cm0 mm <br />0 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
Back shape
keeled +  and rounded +
Basal floret quantity
1 +  and 2 +
Base architecture
pseudopetiolate +  and branching +
Base arrangement
close +
Base fusion
free +
Base position
intravaginal +, extravaginal +, branching +  and basal +
Base size
swelling +
Base texture
hard +
Base width
thick +
Blade arrangement
parallel +
Blade arrangement or course or shape
linear +
Blade length
7 cm70 mm <br />0.07 m <br /> (22 cm220 mm <br />0.22 m <br />) +
Blade prominence
not evident +
Blade shape
cross +, linear +  and narrowly lanceolate +
Blade width
0.3 cm3 mm <br />0.003 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Branch shape
spikelike +
Callus pubescence
hairy +  and glabrous +
Central spikelet architecture
sessile +
Culm architecture
not branching +
Culm architecture or arrangement or growth form
solitary +
Culm duration
annual +
Culm growth form
climbing +
Culm growth form or location
floating +
Culm orientation
erect +
Culm some measurement
40 cm400 mm <br />0.4 m <br /> (85 cm850 mm <br />0.85 m <br />) +
Culm texture
not woody +
Distal floret reproduction
sterile +
Distal floret size
reduced +
Distribution
Alaska +
Embryo quantity
1/3 +
Endosperm texture
liquid +, soft +  and hard +
Filament shape
capillary +
Floret architecture
pistillate +  and staminate +
Floret arrangement
adjacent +
Floret length or size
longer +
Floret quantity
0 +  and 2 +
Floret reproduction
bisexual +
Floret shape
laterally compressed +  and terete +
Glume architecture
1-5-veined +
Glume architecture or shape
awned +
Glume height or length or size
shorter than to longer than the adjacent florets +
Glume position
subtending +
Glume presence
absent +
Glume pubescence or relief
scabrous +
Glume quantity
2 +
Glume shape
awnlike +
Glume size
unequal +
Glume some measurement
0 cm0 mm <br />0 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
Glume variability
equal +
Hair shape
uncinate +
Hilum arrangement or course or shape
linear +
Hilum coloration or relief
punctate +
Hilum shape
Ovate (?) +
Inflorescence architecture
compound +
Inflorescence orientation
nodding +
Inflorescence position or structure subtype
terminal +
Inflorescence shape
spikelike +
Inflorescence some measurement
6 cm60 mm <br />0.06 m <br /> (15 cm150 mm <br />0.15 m <br />) +
Internode architecture
solid +  and hollow +
Internode presence
absent +
Lateral spikelet architecture
pedicellate +
Layer presence
absent +
Leaf arrangement
distichous +
Leaf margin arrangement
Overlapping (?) +
Lemma architecture
5(7)-veined +
Lemma architecture or shape
awned +
Lemma pubescence or relief
scabrous +
Lemma shape
keeled +, lanceolate +  and rectangular +
Lemma some measurement
0.9 cm9 mm <br />0.009 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
Lemma texture
stiffly membranous +  and coriaceous +
Ligule presence
absent +
Lodicule architecture
veined +
Lodicule architecture or pubescence or shape
ciliate +
Lodicule architecture or shape
truncate +
Lodicule prominence
inconspicuous +
Lodicule quantity
2 +
Lodicule shape
lanceolate +
Lodicule texture
fleshy +  and membranous +
Midrib architecture
simple +
Node prominence
concealed +  and prominent +
Number of lower taxa
0 +
Other quantity
2 +  and 1 +
Ovary presence
absent +
Ovary pubescence
hairy +  and glabrous +
Palea development
well-developed +
Palea height or length or size
shorter +
Palea length or size
slightly longer +
Palea presence
absent +
Palea shape
keeled +
Palea size
subequal +
Papilla presence
absent +
Pedicel presence
absent +
Pedicel quantity
0-4 mm +
Pericarp arrangement
separating +
Pericarp condition or texture
dry +
Pericarp texture
dry +  and fleshy +
Pericarp width
thin +
Pseudopetiole presence
absent +
Raceme shape
spikelike +
Rachilla length
prolonged +
Rachis prominence
evident +
Reference
None +
Sheath architecture
open +
Sheath condition
closed +
Sheath length
full +
Source xml
https://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V24/V24 412.xml +
Spike architecture
ebracteate +
Spike shape
spikelike +
Spikelet architecture
subsessile +  and sessile +
Spikelet arrangement
mixed +
Spikelet atypical quantity
7 (?) +
Spikelet fixation
attached +
Spikelet fusion
distinct +
Spikelet quantity
3 +
Spikelet reproduction
bisexual +  and sterile +
Spikelet shape
terete +  and compressed +
Stamen quantity
1 +  and 3 +
Starch-grain architecture
simple +  and compound +
Style-branch atypical quantity
4 +  and 1 +
Style-branch quantity
2 (?) +  and 3 (?) +
Style quantity
2 +
Subsidiary-cell architecture
parallel-sided +
Surface relief
not papillate +
Synonyms
Gramineae +
Taxon family
Poaceae +
Taxon name
×elyhordeum arcuatum +
Taxon parent
×elyhordeum +
Taxon rank
species +
Terminal floret reproduction
sexual +
Tissue coloration
hyaline +
Tissue texture
membranous +
Vein arrangement
converging +
Vein presence
absent +
Vein prominence
inconspicuous +
Vein quantity
2 (?) +
Vein size
major +
Volume
Volume 24 +
Whole organism architecture
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 +
X chromosome quantity
7 +