View source for Dryas alaskensis

{{Treatment/ID
|accepted_name=Dryas alaskensis
|accepted_authority=A. E. Porsild
|publications={{Treatment/Publication
|title=Canad. Field-Naturalist
|place=61: 187, plate 1, figs. 3 – 5. 1948
|year=1948
}}
|common_names=Alaskan mountain-avens
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Dryas octopetala subsp. alaskensis
|authority=(A. E. Porsild) Hultén
|rank=subspecies
}} {{Treatment/ID/Synonym
|name=D. octopetala var. glabrata
|authority=Hultén
|rank=variety
}} {{Treatment/ID/Synonym
|name=D. punctata subsp. alaskensis
|authority=(A. E. Porsild) Jurtzev
|rank=subspecies
}}
|hierarchy=Rosaceae;Rosaceae subfam. Dryadoideae;Rosaceae tribe Dryadeae;Dryas;Dryas alaskensis
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Rosaceae]]</div><div class="higher-taxon"><small>subfamily</small>[[Rosaceae subfam. Dryadoideae]]</div><div class="higher-taxon"><small>tribe</small>[[Rosaceae tribe Dryadeae]]</div><div class="higher-taxon"><small>genus</small>[[Dryas]]</div><div class="higher-taxon"><small>species</small>[[Dryas alaskensis]]</div></div>
|volume=Volume 9
|mention_page=page 328, 330
|treatment_page=page 329
}}<!--

--><span class="statement" id="st-d0_s0" data-properties="whole_organism some measurement;whole_organism growth form"><b>Plants </b>2–18 cm.</span> <span class="statement" id="st-d0_s1" data-properties="leaf-blade shape;leaf-blade length;leaf-blade width;base shape;base shape;base shape;margin shape;apex shape;surface relief;surface architecture or arrangement or shape or vernation;midvein prominence;lateral-vein prominence;abaxial surface pubescence;adaxial surface pubescence;adaxial surface pubescence;hair presence;stipitate-gland presence"><b>Leaf-</b>blades obovate or oblongelliptic to narrowly oblong, 4.5–39 × 2–19 mm, base usually cuneate, sometimes truncate or cordate, margins coarsely dentate to crenate, sinuses 45–60% to midvein, apex rounded to obtuse, surfaces smooth to rugose, plicate, midvein and lateral-veins adaxially sunken into folds, abaxial sparsely hairy to tomentose, adaxial usually glabrous, sometimes sparsely hairy proximally on midvein, feathery hairs and stipitate-glands absent.</span> <span class="statement" id="st-d0_s2" data-properties="peduncle some measurement"><b>Peduncles </b>25–130 mm.</span> <span class="statement" id="st-d0_s3" data-properties="flower orientation"><b>Flowers </b>erect at flowering;</span> <span class="statement" id="st-d0_s4" data-properties="sepal shape;sepal length;sepal width">sepals lanceolate to narrowly elliptic, 5.5–9 × 1.5–2 mm;</span> <span class="statement" id="st-d0_s5" data-properties="petal quantity;petal orientation;petal coloration;petal coloration;petal coloration;petal length;petal width">petals 8, spreading, usually white or cream, sometimes yellow, 9–14 × 5–11 mm;</span> <span class="statement" id="st-d0_s6" data-properties="filament pubescence">filaments glabrous.</span> <span class="statement" id="st-d0_s7" data-properties="achene some measurement"><b>Achenes </b>2–3 mm;</span> <span class="statement" id="st-d0_s8" data-properties="style some measurement;2n chromosome quantity">styles 12–27 mm. <b>2n</b> = 18.</span><!--

-->{{Treatment/Body
|phenology=Flowering Jun–Aug.
|habitat=Solifluction soil, sand-gravel beaches, sandy lakeshores, old beach ridges, wet meadows, stream banks, dry rocky knolls, rocky heath, ericaceous tundra
|elevation=100–1800 m
|distribution=Yukon;Alaska;e Asia (Russian Far East: Chukotka)
|discussion=<p>Dryas punctata Juzepczuk has been reported from North America as a synonym of D. octopetala var. octopetala (E. Hultén 1968); it is now considered to be confined to northeastern Europe and northern Asia (R. Elven et al., http://nhm2.uio.no/paf/). Hultén (1959b) reduced D. octopetala var. glabrata to the rank of forma and later to synonymy under D. alaskensis (Hultén 1968).</p>
|tables=
|references=
}}<!--

--><!--

-->{{#Taxon:
name=Dryas alaskensis
|authority=A. E. Porsild
|rank=species
|parent rank=genus
|synonyms=Dryas octopetala subsp. alaskensis;D. octopetala var. glabrata;D. punctata subsp. alaskensis
|basionyms=
|family=Rosaceae
|phenology=Flowering Jun–Aug.
|habitat=Solifluction soil, sand-gravel beaches, sandy lakeshores, old beach ridges, wet meadows, stream banks, dry rocky knolls, rocky heath, ericaceous tundra
|elevation=100–1800 m
|distribution=Yukon;Alaska;e Asia (Russian Far East: Chukotka)
|reference=None
|publication title=Canad. Field-Naturalist
|publication year=1948
|special status=
|source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V9/V9_537.xml
|subfamily=Rosaceae subfam. Dryadoideae
|tribe=Rosaceae tribe Dryadeae
|genus=Dryas
|species=Dryas alaskensis
|2n chromosome quantity=18
|abaxial surface pubescence=sparsely hairy;tomentose
|achene some measurement=2mm;3mm
|adaxial surface pubescence=hairy;glabrous
|apex shape=rounded;obtuse
|base shape=cordate;truncate;cuneate
|filament pubescence=glabrous
|flower orientation=erect
|hair presence=absent
|lateral-vein prominence=sunken
|leaf-blade length=4.5mm;39mm
|leaf-blade shape=oblongelliptic;narrowly oblong
|leaf-blade width=2mm;19mm
|margin shape=coarsely dentate;crenate
|midvein prominence=sunken
|peduncle some measurement=25mm;130mm
|petal coloration=yellow;cream;white
|petal length=9mm;14mm
|petal orientation=spreading
|petal quantity=8
|petal width=5mm;11mm
|sepal length=5.5mm;9mm
|sepal shape=lanceolate;narrowly elliptic
|sepal width=1.5mm;2mm
|stipitate-gland presence=absent
|style some measurement=12mm;27mm
|surface architecture or arrangement or shape or vernation=plicate
|surface relief=smooth;rugose
|whole_organism growth form=plant
|whole_organism some measurement=2cm;18cm
}}<!--

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