Difference between revisions of "Poa laxa"

Latest revision as of 02:22, 30 July 2020

Plants perennial; not or only slightly glaucous; densely tufted, not stoloniferous, not rhizomatous. Basal branching mixed intra and extra vaginal. Culms 6-18 cm, with 0 (1) exserted nodes, upper node in the lower 1/3 of the culms. Sheaths closed for 1/10 – 1/5 their length, terete, smooth or very sparsely scabrous, distal sheath lengths 0.8-1.8 times blade lengths; ligules 1.25-2.5 mm, smooth, apices obtuse, often lacerate; blades thin, sparsely scabrous adaxially, flag leaf-blades 1.6-3.8 cm. Panicles 1.5-3.5 cm, slightly lax, ovoid, contracted to loosely contracted, dense to moderately dense, with 2-6 branches per node; branches steeply ascending, fairly straight, sulcate or angled, smooth or infrequently the angles sparsely scabrous, not glaucous. Spikelets laterally compressed; florets 2-5; rachilla internodes smooth, glabrous, lower internodes 0.8-1 mm. Glumes equal, broadly lanceolate, thin; lower glumes 0.75-1.05 mm wide, 3-veined; upper glumes 3.7-4.7 mm long, 0.9-1.3 mm wide, lengths 3.7-4.1 times widths; calluses all glabrous, or some proximal florets within a spikelet sparsely webbed; lemmas 3.7-4.5 mm, broadly lanceolate, distinctly keeled, thin, keels and marginal veins short to long-villous, hairs extending 1/3-1/2 the keel length, lateral-veins usually glabrous, or infrequently sparsely softly puberulent, intercostal regions glabrous; palea keels finely scabrous; anthers 0.8-1.2 mm, poorly formed, sacs not fully maturing, not dehiscing, about 0.1 mm in diameter. 2n = ca. 65, 70.

Discussion

Poa laxa × glauca is an eastern low arctic entity which has passed under the name P. flexuosa Sm., P. laxa subsp. flexuosa (Sm.) Hyl., and, more recently, P. laxiuscula (Blytt) Lange. It has also been confused with P. glauca (p. 576). It can be distinguished from P. laxa (see previous) by its more open sheaths and poorly developed, indehiscent anthers. It differs from P. glauca in its broad, thin glumes and lemmas; compact panicles; smooth or nearly smooth, non-glaucous branches; and poorly developed, indehiscent anthers. It also grows in wetter habitats than P. glauca, often around seeps. Its chloroplast DNA is more like that of the American P. laxa subsp. fernaldiana than that of the European subspp. flexuosa and laxa or of P. glauca.

Selected References

None.

Lower Taxa

Poa laxa subsp. banffiana, Poa laxa subsp. fernaldiana

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

@@ Line 1: / Line 1: @@
 {{Treatment/ID
 |accepted_name=Poa laxa
-|accepted_authority=Haenke
+|accepted_authority=
 |publications=
-|common_names=Lax bluegrass
 |basionyms=
 |synonyms=
@@ Line 10: / Line 9: @@
 |volume=Volume 24
 |mention_page=
-|treatment_page=page 570
+|treatment_page=page 572
 }}<!--
---><span class="statement" id="st-d0_s0" data-properties=""><b>Plants </b>perennial;</span> <span class="statement" id="st-d0_s1" data-properties="">not or only slightly glaucous;</span> <span class="statement" id="st-d0_s2" data-properties="">densely tufted, not stoloniferous, not rhizomatous.</span> <span class="statement" id="st-d0_s3" data-properties="whole_organism duration;whole_organism pubescence;whole_organism arrangement or pubescence;whole_organism architecture;whole_organism architecture;whole_organism position;whole_organism architecture;whole_organism arrangement;whole_organism position;whole_organism position;whole_organism position;whole_organism growth form"><b>Basal </b>branching mixed, mainly extravaginal or mainly pseudointravaginal, sometimes intravaginal.</span> <span class="statement" id="st-d0_s4" data-properties="culm height;culm thickness;culm orientation;culm size"><b>Culms </b>8-35 cm tall, 0.5-0.9 mm thick, ascending to erect, slender;</span> <span class="statement" id="st-d0_s5" data-properties="node shape;node presence;node atypical quantity;node position">nodes terete, 0 (1) exserted.</span> <span class="statement" id="st-d0_s6" data-properties="sheath length;sheath shape;sheath architecture or pubescence or relief;sheath pubescence;base pubescence"><b>Sheaths </b>closed for 1/5-1/3 their length, terete, smooth, glabrous, bases of basal sheaths glabrous;</span> <span class="statement" id="st-d0_s7" data-properties="collar pubescence;collar pubescence;collar pubescence">collars smooth or scabrous, glabrous;</span> <span class="statement" id="st-d0_s8" data-properties="ligule some measurement;ligule architecture or pubescence or relief;apex shape;apex shape">ligules 2-4 mm, smooth, apices acute, often lacerate;</span> <span class="statement" id="st-d0_s9" data-properties="">innovation blades similar to the cauline blades;</span> <span class="statement" id="st-d0_s10" data-properties="cauline blade width;cauline blade width;cauline blade prominence or shape;cauline blade width;cauline blade pubescence or texture;cauline blade architecture or pubescence or relief;cauline blade architecture;blade size">cauline blades 1-2 (3) mm wide, flat, thin, soft, smooth, narrowly prow-tipped, blades not strongly graduated or reduced upwards.</span> <span class="statement" id="st-d0_s11" data-properties="panicle some measurement;panicle architecture or arrangement;panicle condition or size;panicle count or density;panicle condition or size;panicle density"><b>Panicles </b>2-8 cm, slightly lax, usually loosely contracted and sparse, infrequently contracted and dense;</span> <span class="statement" id="st-d0_s12" data-properties="branch atypical quantity;branch quantity">nodes with 1-3 (5) branches;</span> <span class="statement" id="st-d0_s13" data-properties="branch atypical some measurement;branch some measurement;branch orientation;branch orientation;branch orientation;branch course;branch course;branch size;branch architecture;branch shape;branch architecture or pubescence or relief;angle pubescence or relief;spikelet quantity">branches 1-3 (4) cm, usually ascending or weakly spreading, infrequently erect, fairly straight or flexuous, slender, sulcate or angled, smooth or the angles sparsely scabrous, with 1-8 spikelets.</span> <span class="statement" id="st-d0_s14" data-properties="spikelet some measurement;spikelet l w ratio;spikelet shape"><b>Spikelets </b>4-6 mm, lengths to 3 times widths, laterally compressed;</span> <span class="statement" id="st-d0_s15" data-properties="floret quantity">florets 2-5;</span> <span class="statement" id="st-d0_s16" data-properties="rachilla internode some measurement;rachilla internode architecture or pubescence or relief;rachilla internode pubescence">rachilla internodes shorter than 1 mm, smooth, glabrous.</span> <span class="statement" id="st-d0_s17" data-properties="glume variability;glume length or size;glume shape;glume width;glume shape;lemma arrangement;keel architecture or pubescence or relief;keel pubescence or relief"><b>Glumes </b>nearly equaling or slightly longer than the adjacent lemmas, lanceolate to broadly lanceolate, thin, distinctly keeled, keels smooth or sparsely scabrous;</span> <span class="statement" id="st-d0_s18" data-properties="lower glume architecture">lower glumes 1-3-veined;</span> <span class="statement" id="st-d0_s19" data-properties="upper glume height or length or size;lowest lemma size">upper glumes shorter than or subequal to the lowest lemmas;</span> <span class="statement" id="st-d0_s20" data-properties="callus pubescence;callus pubescence;hair height or length or size;hair length;lemma quantity">calluses glabrous or webbed, hairs usually shorter than 1/4 the lemma length, sparse;</span> <span class="statement" id="st-d0_s21" data-properties="lemma some measurement;lemma shape;lemma width;lemma shape;keel height or length or size;keel pubescence;marginal vein height or length or size;marginal vein pubescence;lateral-vein pubescence;lateral-vein pubescence;lateral-vein prominence;intercostal region pubescence;margin pubescence;apex shape">lemmas 3-4.6 mm, lanceolate to broadly lanceolate, thin, distinctly keeled, keels and marginal veins short to long-villous, lateral-veins glabrous or sparsely softly puberulent, lateral-veins obscure, intercostal regions glabrous, margins glabrous, apices acute;</span> <span class="statement" id="st-d0_s22" data-properties="palea pubescence or relief">paleas sparsely scabrous over the keels;</span> <span class="statement" id="st-d0_s23" data-properties="">anthers (0.6) 0.8-1.1 (1.3) mm.</span> <span class="statement" id="st-d0_s24" data-properties="anther atypical some measurement;anther some measurement;2n chromosome quantity;2n chromosome quantity;2n chromosome quantity">2n = 28, 42, 84.</span><!--
+--><span class="statement" id="st-d0_s0" data-properties=""><b>Plants </b>perennial;</span> <span class="statement" id="st-d0_s1" data-properties="">not or only slightly glaucous;</span> <span class="statement" id="st-d0_s2" data-properties="">densely tufted, not stoloniferous, not rhizomatous.</span> <span class="statement" id="st-d0_s3" data-properties="whole_organism duration;whole_organism pubescence;whole_organism arrangement or pubescence;whole_organism architecture;whole_organism architecture;whole_organism position;whole_organism architecture;whole_organism arrangement;whole_organism growth form"><b>Basal </b>branching mixed intra and extra vaginal.</span> <span class="statement" id="st-d0_s4" data-properties="culm some measurement;exserted node presence;exserted node atypical quantity"><b>Culms </b>6-18 cm, with 0 (1) exserted nodes, upper node in the lower 1/3 of the culms.</span> <span class="statement" id="st-d0_s5" data-properties="sheath length;sheath shape;sheath architecture or pubescence or relief;sheath pubescence or relief;distal sheath length"><b>Sheaths </b>closed for 1/10 – 1/5 their length, terete, smooth or very sparsely scabrous, distal sheath lengths 0.8-1.8 times blade lengths;</span> <span class="statement" id="st-d0_s6" data-properties="ligule some measurement;ligule architecture or pubescence or relief;apex shape;apex shape">ligules 1.25-2.5 mm, smooth, apices obtuse, often lacerate;</span> <span class="statement" id="st-d0_s7" data-properties="blade width;blade pubescence or relief;blade-leaf distance">blades thin, sparsely scabrous adaxially, flag leaf-blades 1.6-3.8 cm.</span> <span class="statement" id="st-d0_s8" data-properties="panicle some measurement;panicle architecture or arrangement;panicle shape;panicle condition or size;panicle density;branch quantity"><b>Panicles </b>1.5-3.5 cm, slightly lax, ovoid, contracted to loosely contracted, dense to moderately dense, with 2-6 branches per node;</span> <span class="statement" id="st-d0_s9" data-properties="branch orientation;branch course;branch architecture;branch shape;branch architecture or pubescence or relief;angle pubescence or relief;angle pubescence">branches steeply ascending, fairly straight, sulcate or angled, smooth or infrequently the angles sparsely scabrous, not glaucous.</span> <span class="statement" id="st-d0_s10" data-properties="spikelet shape"><b>Spikelets </b>laterally compressed;</span> <span class="statement" id="st-d0_s11" data-properties="floret quantity">florets 2-5;</span> <span class="statement" id="st-d0_s12" data-properties="rachilla internode architecture or pubescence or relief;rachilla internode pubescence;lower internode some measurement">rachilla internodes smooth, glabrous, lower internodes 0.8-1 mm.</span> <span class="statement" id="st-d0_s13" data-properties="glume variability;glume shape;glume width"><b>Glumes </b>equal, broadly lanceolate, thin;</span> <span class="statement" id="st-d0_s14" data-properties="lower glume width;lower glume architecture">lower glumes 0.75-1.05 mm wide, 3-veined;</span> <span class="statement" id="st-d0_s15" data-properties="upper glume length;upper glume width;upper glume l w ratio">upper glumes 3.7-4.7 mm long, 0.9-1.3 mm wide, lengths 3.7-4.1 times widths;</span> <span class="statement" id="st-d0_s16" data-properties="callus pubescence;spikelet pubescence">calluses all glabrous, or some proximal florets within a spikelet sparsely webbed;</span> <span class="statement" id="st-d0_s17" data-properties="lemma some measurement;lemma shape;lemma shape;lemma width;keel height or length or size;keel pubescence;marginal vein height or length or size;marginal vein pubescence;keel quantity;lateral-vein length;lateral-vein length;lateral-vein pubescence;lateral-vein pubescence;intercostal region pubescence">lemmas 3.7-4.5 mm, broadly lanceolate, distinctly keeled, thin, keels and marginal veins short to long-villous, hairs extending 1/3-1/2 the keel length, lateral-veins usually glabrous, or infrequently sparsely softly puberulent, intercostal regions glabrous;</span> <span class="statement" id="st-d0_s18" data-properties="palea keel pubescence or relief">palea keels finely scabrous;</span> <span class="statement" id="st-d0_s19" data-properties="anther some measurement">anthers 0.8-1.2 mm, poorly formed, sacs not fully maturing, not dehiscing, about 0.1 mm in diameter.</span> <span class="statement" id="st-d0_s20" data-properties="sac life cycle;sac dehiscence;sac diameter;2n chromosome quantity;2n chromosome quantity">2n = ca. 65, 70.</span><!--
 -->{{Treatment/Body
-|distribution=Maine;N.H.;Colo.;N.Y.;Vt.;Mont.;Oreg.;Wyo.;Alta.;B.C.;Nfld. and Labr.;Que.
+|discussion=<p>Poa laxa × glauca is an eastern low arctic entity which has passed under the name P. flexuosa Sm., P. laxa subsp. flexuosa (Sm.) Hyl., and, more recently, P. laxiuscula (Blytt) Lange. It has also been confused with P. glauca (p. 576). It can be distinguished from P. laxa (see previous) by its more open sheaths and poorly developed, indehiscent anthers. It differs from P. glauca in its broad, thin glumes and lemmas; compact panicles; smooth or nearly smooth, non-glaucous branches; and poorly developed, indehiscent anthers. It also grows in wetter habitats than P. glauca, often around seeps. Its chloroplast DNA is more like that of the American P. laxa subsp. fernaldiana than that of the European subspp. flexuosa and laxa or of P. glauca.</p>
-|discussion=<p>Poa laxa is a low arctic to high alpine amphiatlantic species. It has been treated as a series of separate species, but the differences seem relatively minor and incomplete. Its short anthers and smoother branches usually distinguish it from P. glauca (p. 576), with which it can hybridize to form P. laxa x glauca (p. 572).</p><!--
---><p>Poa laxa has four subspecies, two of which are native to the Flora region; subsp. laxa grows in central Europe; and subsp. flexuosa (Sm.) Hyl. in northwestern Europe.</p>
 |tables=
 |references=
 }}<!--
---><div class="treatment-key">
+--><!--
-==Key==
-<div class="treatment-key-group">
-{| class="wikitable fna-keytable"
-|-id=key-0-1
-|1
-|Innovations primarily extravaginal; panicle branches fairly straight; calluses glabrous
-|[[Poa laxa subsp. banffiana|Poa laxa subsp. banffiana]]
-|-id=key-0-1
-|1
-|Innovations primarily intravaginal; panicle branches flexuous, usually at least some florets having a webbed callus
-|[[Poa laxa subsp. fernaldiana|Poa laxa subsp. fernaldiana]]
-|}
-</div></div><!--
 -->{{#Taxon:
 name=Poa laxa
-|authority=Haenke
+|authority=
 |rank=species
 |parent rank=section
@@ Line 47: / Line 30: @@
 |basionyms=
 |family=Poaceae
-|illustrator=Sandy Long
-|illustration copyright=Utah State University
-|distribution=Maine;N.H.;Colo.;N.Y.;Vt.;Mont.;Oreg.;Wyo.;Alta.;B.C.;Nfld. and Labr.;Que.
 |reference=None
 |publication title=
 |publication year=
 |special status=
-|source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V24/V24_796.xml
+|source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V24/V24_799.xml
 |subfamily=Poaceae subfam. Pooideae
 |tribe=Poaceae tribe Poeae
@@ Line 61: / Line 41: @@
 |section=Poa sect. Oreinos
 |species=Poa laxa
-|2n chromosome quantity=84;42;28
+|2n chromosome quantity=70;65
+|angle pubescence=not glaucous
 |angle pubescence or relief=scabrous
-|anther atypical some measurement=0.6
+|anther some measurement=0.8mm;1.2mm
-|anther some measurement=0.8mm;1.1mm
+|apex shape=lacerate;obtuse
-|apex shape=acute;lacerate;acute
+|blade pubescence or relief=scabrous
-|base pubescence=glabrous
+|blade width=thin
-|blade size=reduced
+|blade-leaf distance=1.6cm;3.8cm
 |branch architecture=sulcate
 |branch architecture or pubescence or relief=smooth
-|branch atypical quantity=5
+|branch course=straight
-|branch atypical some measurement=4
+|branch orientation=ascending
-|branch course=flexuous;straight
+|branch quantity=2;6
-|branch orientation=erect;spreading;ascending
-|branch quantity=1;3
 |branch shape=angled
-|branch size=slender
+|callus pubescence=glabrous
-|branch some measurement=1cm;3cm
+|culm some measurement=6cm;18cm
-|callus pubescence=webbed;glabrous
+|distal sheath length=0.8-1.8 times blade lengths
-|cauline blade architecture=prow-tipped
+|exserted node atypical quantity=1
-|cauline blade architecture or pubescence or relief=smooth
+|exserted node presence=absent
-|cauline blade prominence or shape=flat
-|cauline blade pubescence or texture=soft
-|cauline blade width=thin;1mm;2mm
-|collar pubescence=glabrous;scabrous;smooth
-|culm height=8cm;35cm
-|culm orientation=ascending;erect
-|culm size=slender
-|culm thickness=0.5mm;0.9mm
 |floret quantity=2;5
-|glume length or size=slightly longer
+|glume shape=lanceolate
-|glume shape=keeled;lanceolate;broadly lanceolate
+|glume variability=equal
-|glume variability=equaling
 |glume width=thin
-|hair height or length or size=usually shorter
-|hair length=sparse
 |intercostal region pubescence=glabrous
-|keel architecture or pubescence or relief=smooth
 |keel height or length or size=short
 |keel pubescence=long-villous
-|keel pubescence or relief=scabrous
+|keel quantity=1/3;1/2
-|lateral-vein prominence=obscure
+|lateral-vein length=puberulent;glabrous
 |lateral-vein pubescence=puberulent;glabrous
-|lemma arrangement=adjacent
+|lemma shape=keeled;lanceolate
-|lemma quantity=1/4
+|lemma some measurement=3.7mm;4.5mm
-|lemma shape=keeled;lanceolate;broadly lanceolate
-|lemma some measurement=3mm;4.6mm
 |lemma width=thin
 |ligule architecture or pubescence or relief=smooth
-|ligule some measurement=2mm;4mm
+|ligule some measurement=1.25mm;2.5mm
-|lower glume architecture=1-3-veined
+|lower glume architecture=3-veined
-|lowest lemma size=subequal
+|lower glume width=0.75mm;1.05mm
-|margin pubescence=glabrous
+|lower internode some measurement=0.8mm;1mm
 |marginal vein height or length or size=short
 |marginal vein pubescence=long-villous
-|node atypical quantity=1
+|palea keel pubescence or relief=scabrous
-|node position=exserted
-|node presence=absent
-|node shape=terete
-|palea pubescence or relief=scabrous
 |panicle architecture or arrangement=lax
-|panicle condition or size=contracted;contracted
+|panicle condition or size=contracted;loosely contracted
-|panicle count or density=sparse
+|panicle density=dense;moderately dense
-|panicle density=dense
+|panicle shape=ovoid
-|panicle some measurement=2cm;8cm
+|panicle some measurement=1.5cm;3.5cm
 |rachilla internode architecture or pubescence or relief=smooth
 |rachilla internode pubescence=glabrous
-|rachilla internode some measurement=1
+|sac dehiscence=not dehiscing
+|sac diameter=0.1
+|sac life cycle=maturing
 |sheath architecture or pubescence or relief=smooth
 |sheath length=closed
-|sheath pubescence=glabrous
+|sheath pubescence or relief=scabrous
 |sheath shape=terete
-|spikelet l w ratio=0-3
+|spikelet pubescence=webbed
-|spikelet quantity=1;8
 |spikelet shape=compressed
-|spikelet some measurement=4mm;6mm
+|upper glume l w ratio=3.7-4.1
-|upper glume height or length or size=shorter
+|upper glume length=3.7mm;4.7mm
+|upper glume width=0.9mm;1.3mm
 |whole_organism architecture=branching;not rhizomatous;not stoloniferous
 |whole_organism arrangement=mixed
@@ Line 142: / Line 105: @@
 |whole_organism duration=perennial
 |whole_organism growth form=plant
-|whole_organism position=intravaginal;pseudointravaginal;extravaginal;basal
+|whole_organism position=basal
 |whole_organism pubescence=glaucous
 }}<!--
 -->[[Category:Treatment]][[Category:Poa sect. Oreinos]]

Difference between revisions of "Poa laxa"

Latest revision as of 02:22, 30 July 2020

Contents

Discussion

Selected References

Lower Taxa