familyPoaceae
subfamilyPoaceae subfam. Pooideae
tribePoaceae tribe Poeae
genusPoa
subgenusPoa subg. Arctopoa
sectionPoa sect. Arctopoa

Poa sect. Arctopoa

(Griseb.) Tzvelev
Robert J. Soreng
Treatment appears in FNA Volume 24.

Plants perennial. Ligules 1-3.5 mm, yellow-cream to brown; blades flat, thick, apices broadly prow-shaped. Panicles 8-30 cm, erect, loosely contracted; branches 3-10 cm, steeply ascending, terete. Spikelets not bulbiferous. Glumes distinctly keeled, keels smooth; calluses of proximal lemmas usually with a crown of hairs, hairs 1-2 mm; lemmas 4.5-7 mm, thinly membranous, glabrous or the keels and marginal veins long-villous, intercostal regions glabrous or hispidulous, moderately to densely scabrous; palea keels scabrous; anthers 3, 1.7-3.2 mm.

Discussion

Poa sect. Arctopoa has one species. It grows along boreal and low arctic coasts in North America, and from the Russian Far East to northern Japan. Poa sect. Aphydris (Griseb.) Tzvelev, the other section in the subgenus, is restricted to central and east Asia.

Selected References

None.

Lower Taxa

"thick" is not a number."decumbent" is not a number."thick" is not a number."wide" is not a number.

... more about "Poa sect. Arctopoa"
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Abaxial ligule presence
absent +
Abaxial ligule quantity
common +
Abaxial surface architecture or pubescence or relief
smooth +
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 quantity
3 +
Anther some measurement
0.17 cm1.7 mm <br />0.0017 m <br /> (0.32 cm3.2 mm <br />0.0032 m <br />) +
Apex coloration
scarious-hyaline +
Apex shape
prow--shaped +
Arm cell presence
absent +
Auricle presence
absent +
Author
Robert J. Soreng +
Authority
(Griseb.) 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 pubescence
strigose +
Base size
swelling +
Base texture
hard +
Base width
thick +
Blade arrangement
parallel +
Blade arrangement or course or shape
linear +
Blade prominence
not evident +
Blade prominence or shape
flat +
Blade shape
involute +, folded +  and flat +
Branch architecture or arrangement
lax +
Branch atypical quantity
1 (?) +
Branch course
straight +
Branch orientation
ascending +
Branch pubescence or relief
scabrous +
Branch quantity
2;5 +
Branch shape
terete +
Branch some measurement
3 cm30 mm <br />0.03 m <br /> (10 cm100 mm <br />0.1 m <br />) +
Callus development
developed +
Callus pubescence
with a crown +  and glabrous +
Callus shape
terete +, pointed +, blunt +  and angled +
Culm architecture
branching +
Culm architecture or arrangement or growth form
solitary +
Culm duration
annual +
Culm growth form
climbing +
Culm growth form or location
floating +
Culm height
20 cm200 mm <br />0.2 m <br /> (115 cm1,150 mm <br />1.15 m <br />) +
Culm orientation
ascending +  and erect +
Culm position
extravaginal +  and basal +
Culm shape
compressed +  and terete +
Culm some measurement
1 cm10 mm <br />0.01 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +
Culm texture
not woody +
Culm thickness
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Distal floret size
reduced +
Distribution
Ill. +, Ind. +, Conn. +, N.J. +, N.Y. +, Ga. +, Wash. +, Utah +, Alaska +, Colo. +, Idaho +, N.Mex. +, Nev. +, Maine +, N.H. +, Vt. +, Del. +, D.C +, Wis. +, Iowa +, Mont. +, Oreg. +, Wyo. +, Pacific Islands (Hawaii) +, Md. +, Mass. +, R.I. +, Fla. +, Calif. +, W.Va. +, Tex. +, La. +, N.C. +, N.Dak. +, Nebr. +, Tenn. +, Ala. +, Ark. +, Ariz. +, Kans. +, Ky. +, Mich. +, Minn. +, Mo. +, Miss. +, Ohio +, Okla. +, Pa. +, Puerto Rico +, S.C. +, S.Dak. +, Va. +, Alta. +, B.C. +, Greenland +, Man. +, N.B. +, Nfld. and Labr. +, N.S. +, N.W.T. +, Nunavut +, Ont. +, P.E.I. +, Que. +, Sask. +  and Yukon +
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 atypical quantity
8 +
Floret length or size
sometimes longer +
Floret position or shape
distal +
Floret quantity
2 +  and 6 +
Floret reproduction
bisexual +
Floret shape
compressed +
Floret size
reduced +
Glume architecture
1-3(5)-veined +
Glume architecture or shape
awned +
Glume height or length or size
usually shorter +
Glume length or size
shorter or longer +
Glume position
subtending +
Glume presence
absent +
Glume quantity
2 +
Glume shape
keeled +
Glume size
subequal +
Glume variability
equal +
Hair arrangement
distributed +
Hair shape
uncinate +
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 position
subbasal +
Hilum quantity
0 +  and 1/6 +
Hilum shape
Oval (?) +  and Round (?) +
Inflorescence architecture
compound +
Inflorescence position or structure subtype
terminal +
Inflorescence shape
racemelike +
Inflorescence size
reduced +
Intercostal region coloration
milky white +  and slightly greenish +
Intercostal region pubescence
hispidulous +  and moderately densely scabrous +
Internode architecture
hollow +
Internode presence
absent +
Keel architecture or pubescence or relief
smooth +
Keel pubescence
long-villous +
Keel pubescence or relief
scabrous +
Lateral-vein prominence
faint +
Layer presence
absent +
Leaf arrangement
distichous +
Leaf margin arrangement
Overlapping (?) +
Lemma architecture
5-7-veined +
Lemma architecture or shape
awned +
Lemma height or length or size
shorter +
Lemma length or size
longer +
Lemma pubescence
glabrous +
Lemma shape
keeled +
Lemma some measurement
0.45 cm4.5 mm <br />0.0045 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
Lemma texture
membranous +
Ligule atypical some measurement
5.5 +
Ligule coloration
yellow-cream +  and brown +
Ligule presence
absent +
Ligule pubescence
ciliolate +
Ligule shape
truncate +  and obtuse +
Ligule some measurement
0.1 cm1 mm <br />0.001 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
Ligule texture
membranous +
Lodicule architecture
veined +
Lodicule architecture or pubescence or shape
ciliate +
Lodicule architecture or shape
truncate +
Lodicule prominence
inconspicuous +
Lodicule pubescence
glabrous +
Lodicule quantity
2 +
Lodicule shape
lobed +  and lanceolate +
Lodicule texture
membranous +
Lower glume architecture
veined +
Lower glume length or size
longer +
Lower glume quantity
1 +  and 3 +
Lower glume some measurement
0 cm0 mm <br />0 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Margin coloration
milky white +  and slightly greenish +
Margin pubescence or relief
scabrous +
Marginal vein pubescence
long-villous +
Midrib architecture
simple +
Node prominence
concealed +  and prominent +
Number of lower taxa
1 +
Other quantity
2 +  and 1 +
Outer margin pubescence
scabrous +  and smooth +
Ovary presence
absent +
Ovary pubescence
glabrous +
Palea development
well-developed +
Palea presence
absent +
Palea quantity
2/3 +
Palea shape
2-keeled +
Palea size
subequal +
Panicle architecture
open +
Panicle condition or size
contracted +
Panicle orientation
erect +
Panicle shape
spikelike +
Panicle size
reduced +
Panicle some measurement
8 cm80 mm <br />0.08 m <br /> (30 cm300 mm <br />0.3 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 internode pubescence
hairy +, glabrous +, scabrous +  and smooth +
Rachilla length
prolonged +
Rachis prominence
evident +
Reference
None +
Sheath architecture
open +
Sheath condition
closed +
Sheath length
closed +
Sheath shape
terete +
Source xml
https://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V24/V24 843.xml +
Spike architecture
ebracteate +
Spikelet architecture
not bulbiferous +
Spikelet arrangement
mixed +
Spikelet fixation
attached +
Spikelet quantity
1 +  and 60 +
Spikelet reproduction
viviparous +
Spikelet shape
compressed +
Spikelet some measurement
0.5 cm5 mm <br />0.005 m <br /> (1.2 cm12 mm <br />0.012 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
Poa sect. Arctopoa +
Taxon parent
Poa subg. Arctopoa +
Taxon rank
section +
Terminal floret reproduction
sexual +
Tissue coloration
hyaline +
Tissue texture
membranous +
Tuft quantity
1 +
Upper glume architecture
veined +
Upper glume quantity
3 +
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 +
Whole organism reproduction
asexual +, dioecious +, gynodioecious +, monoecious +  and synoecious +
X chromosome quantity
7 +