familyPoaceae
subfamilyPoaceae subfam. Pooideae
tribePoaceae tribe Poeae
genus×arctodupontia
species×arctodupontia scleroclada

×arctodupontia scleroclada

(Rupr.) Tzvelev
Stephen J. Darbyshire, Jacques Cayouette
Treatment appears in FNA Volume 24. Treatment on page 605.
Please click on the illustration for a higher resolution version.
Illustrator: Cindy Roché

Copyright: Utah State University

Culms 13-40 cm. Ligules 2-4 mm; blades 2-6 cm long, 1.5-4 mm wide. Panicles 4-12 cm, partly or completely exserted. Spikelets 3.5-7 mm. Glumes 3-6 mm; lower glumes 1-veined; upper glumes 1 (3) -veined; lemmas 3-5 mm, paleas about as long as the lemmas; anthers to about 2 mm. 2n = unknown.

Distribution

Nunavut

Discussion

×Arctodupontia scleroclada is known from Mansfield Island in northern Hudson Bay, and from Malaya Zemlya and the Chukchi Peninsula in Russia. Plants seemingly intermediate between Dupontia fisheri and Arctopbila fulva are common, but caution must be exercised in assigning them to ×Arctodupontia. The hybrids differ from their parents in being sterile (as indicated by their indehiscent anthers), and in having lemmas with truncate, lacerate to dentate apices. Dupontia has lemmas with acute to acuminate apices; Arctopbila has lemmas with obtuse, entire apices.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "×arctodupontia scleroclada"
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Abaxial ligule presence
absent +
Abaxial ligule quantity
common +
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 +
Anther dehiscence
indehiscent +
Anther quantity
3 +
Anther some measurement
2 cm20 mm <br />0.02 m <br /> (?) +
Apex architecture or shape
lacerate-dentate +  and truncate +
Arm cell presence
absent +
Auricle presence
absent +
Author
Stephen J. Darbyshire +  and Jacques Cayouette +
Authority
(Rupr.) Tzvelev +
Awn atypical quantity
1 (?) +  and 3 (?) +
Awn course
straight +
Awn orientation
arising +
Awn position
basal +  and terminal +
Awn quantity
single +
Awn shape
bent +
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
2 cm20 mm <br />0.02 m <br /> (6 cm60 mm <br />0.06 m <br />) +
Blade prominence
not evident +
Blade pubescence
glabrous +
Blade shape
folded +  and flat +
Blade width
0.15 cm1.5 mm <br />0.0015 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Branch fragility
stiff +
Branch pubescence
glabrous +
Branch shape
spikelike +
Callus development
developed +
Callus pubescence
hairy +  and glabrous +
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
ascending +  and erect +
Culm some measurement
13 cm130 mm <br />0.13 m <br /> (40 cm400 mm <br />0.4 m <br />) +
Culm texture
not woody +
Distal floret size
reduced +
Distribution
Nunavut +
Embryo quantity
1/4 +  and 1/3 +
Endosperm texture
liquid +, soft +  and hard +
Filament shape
capillary +
Floret architecture
pistillate +  and staminate +
Floret arrangement
adjacent +
Floret length or size
sometimes longer +
Floret position or shape
distal +
Floret quantity
2 +  and 4 +
Floret reproduction
sterile +  and bisexual +
Floret shape
compressed +
Floret size
reduced +
Glume architecture or shape
awned +
Glume height or length or size
shorter +
Glume length or size
shorter or longer +
Glume position
subtending +
Glume presence
absent +
Glume quantity
2 +
Glume shape
acute +  and ovate +
Glume size
subequal +
Glume some measurement
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
Glume texture
membranous +
Glume variability
equal +
Hair fragility
stiff +
Hair quantity
scant +
Hair shape
uncinate +
Hilum arrangement or course or shape
linear +
Hilum coloration or relief
punctate +
Hilum shape
Ovate (?) +
Illustration
Present +
Illustration copyright
Utah State University +
Illustrator
Cindy Roché +
Inflorescence architecture
compound +
Inflorescence position or structure subtype
terminal +
Internode architecture
hollow +
Internode presence
absent +
Layer presence
absent +
Leaf arrangement
distichous +
Leaf margin arrangement
Overlapping (?) +
Lemma architecture
1(3)-veined +
Lemma architecture or shape
awned +
Lemma height or length or size
shorter +
Lemma length or size
longer +
Lemma shape
ovate +
Lemma some measurement
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Lemma texture
membranous +  and subcoriaceous +
Ligule presence
absent +
Ligule shape
lacerate +, acute +  and truncate +
Ligule some measurement
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Ligule texture
membranous +
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
membranous +
Lower branch orientation
reflexed +
Lower glume architecture
1-veined +
Midrib architecture
simple +
Node prominence
concealed +  and prominent +
Number of lower taxa
0 +
Other quantity
2 +  and 1 +
Ovary presence
absent +
Ovary pubescence
glabrous +
Palea development
well-developed +
Palea presence
absent +
Palea pubescence
glabrous +
Palea shape
2-keeled +
Palea size
minute +
Panicle position
exserted +
Panicle shape
spikelike +
Panicle size
reduced +
Panicle some measurement
4 cm40 mm <br />0.04 m <br /> (12 cm120 mm <br />0.12 m <br />) +
Papilla presence
absent +
Pericarp arrangement
separating +
Pericarp condition or texture
dry +
Pericarp texture
dry +  and fleshy +
Pericarp width
thin +
Pseudopetiole development
not developed +
Pseudopetiole presence
absent +
Rachilla length
prolonged +
Rachis prominence
evident +
Reference
None +
Sheath architecture
open +
Sheath condition
closed +
Sheath length
closed +
Source xml
https://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V24/V24 854.xml +
Spike architecture
ebracteate +
Spikelet arrangement
mixed +
Spikelet fixation
attached +
Spikelet quantity
1 +  and 60 +
Spikelet reproduction
viviparous +
Spikelet shape
compressed +
Spikelet some measurement
0.35 cm3.5 mm <br />0.0035 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
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 +
Synonyms
Gramineae +
Taxon family
Poaceae +
Taxon name
×arctodupontia scleroclada +
Taxon parent
×arctodupontia +
Taxon rank
species +
Terminal floret reproduction
sexual +
Tissue coloration
hyaline +
Tissue texture
membranous +
Upper glume architecture
1(3)-veined +
Vein arrangement
parallel +  and converging +
Vein presence
absent +
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 +
Whole organism growth form or habitat
aquatic +  and terrestrial +
X chromosome quantity
7 +