View source for Potentilla arenosa

{{Treatment/ID
|accepted_name=Potentilla arenosa
|accepted_authority=(Turczaninow) Juzepczuk
|publications={{Treatment/Publication
|title=in V. L. Komarov et al., Fl. URSS
|place=10: 137. 1941
|year=1941
}}
|basionyms={{Treatment/ID/Basionym
|name=Potentilla nivea var. arenosa
|authority=Turczaninow
|rank=variety
|publication_title=Bull. Soc. Imp. Naturalistes Moscou
|publication_place=16: 607. 1843
}}
|synonyms=
|hierarchy=Rosaceae;Rosaceae subfam. Rosoideae;Rosaceae tribe Potentilleae;Potentilla;Potentilla sect. Niveae;Potentilla arenosa
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Rosaceae]]</div><div class="higher-taxon"><small>subfamily</small>[[Rosaceae subfam. Rosoideae]]</div><div class="higher-taxon"><small>tribe</small>[[Rosaceae tribe Potentilleae]]</div><div class="higher-taxon"><small>genus</small>[[Potentilla]]</div><div class="higher-taxon"><small>section</small>[[Potentilla sect. Niveae]]</div><div class="higher-taxon"><small>species</small>[[Potentilla arenosa]]</div></div>
|volume=Volume 9
|mention_page=page 196, 197, 199, 201, 205, 206, 208
|treatment_page=page 200
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>scarcely to ± tufted. <b>Caudex</b> branches thick, not columnar, not sheathed with marcescent whole leaves. <b>Stems</b> ascending to erect, (0.3–)0.8–2.5(–4.5) dm, lengths (2–)3–5 times basal leaves. <b>Basal</b> leaves 1.5–12(–20) cm; petiole 1–7(–15) cm, long hairs sparse to abundant, spreading to ± ascending, rarely loosely appressed, 1–2(–2.5) mm, usually stiff, sometimes weak (subsp.<i> chamissonis</i>), verrucose, short and/or crisped hairs absent or sparse to abundant, cottony hairs absent, glands absent or sparse; leaflets separate to ± overlapping, central obovate, 1–3.5(–4.5) × 0.5–2(–3) cm, usually petiolulate, petiolule to 5 mm, base cuneate, margins slightly revolute, distal ± 3/4 incised ± 1/2 to midvein, teeth (2–)3–4(–6) per side, ± approximate to distant, surfaces dissimilar, often strongly so, abaxial white to gray, long hairs 0.5–1.8 mm, cottony-crisped hairs ± dense, adaxial green, sometimes grayish green, long hairs sparse to abundant, short-crisped hairs sparse to abundant. <b>Cauline</b> leaves (0–)1–2. <b>Inflorescence</b> 1–7(–15)-flowered. <b>Pedicels</b> 1.5–5 cm in flower, to 6(–10) cm in fruit. <b>Flowers</b>: epicalyx bractlets linear-lanceolate to lanceolate-elliptic, 2–5(–7) × 0.4–1.2(–1.5) mm, 1/4–1/2 as wide as sepals, margins usually flat, red glands absent or sparse and inconspicuous; hypanthium 3–5 mm diam.; sepals 3–6(–8) mm, apex acute; petals 4–7(–10) × 4–7(–9) mm, ± longer than sepals; filaments 0.8–1 mm, anthers 0.4 mm; carpels 28–40, apical hairs absent, styles conic-columnar, strongly papillate-swollen in proximal 1/5–1/3, 1–1.5 mm. <b>Achenes</b> 1.1 mm.</span><!--

-->{{Treatment/Body
|distribution=Alta.;B.C.;Man.;N.W.T.;Nunavut;Que.;Sask.;Yukon;Alaska;Eurasia.
|discussion=<p>Subspecies 2 (2 in the flora).</p><!--
--><p>The name <i>Potentilla arenosa</i> is now used for most arctic and subarctic plants previously treated as <i>P. hookeriana</i> or <i>P. nivea</i> subsp. <i>hookeriana</i> (Lehmann) Hiitonen. As noted by J. Soják (1986), the type of <i>P. hookeriana</i> has quinate leaves; that name is now restricted to a Rocky Mountain species in sect. Rubricaules. The arctic and subarctic material was briefly (1989–1999) called <i>P. nivea</i>, as discussed under that species. Because the type of <i>P. nivea</i> var. <i>arenosa</i> and other northern Asian specimens correspond closely to the North American plants, the name <i>P. arenosa</i> is assigned here.</p><!--
--><p>The two subspecies differ only in one character, the petiole hairs, but are largely allopatric. Subspecies <i>arenosa</i> occurs in western and northern Greenland, northern North America (very northern in the east), and northern Asia (and perhaps northeasternmost European Russia); subsp.<i> chamissonis</i> occurs in southern Greenland, northeastern North America (more southern than subsp.<i> arenosa</i>), and northern Europe at least east to the Urals.</p>
|tables=
|references=
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|- id="key-0-1"
|1
|Petioles with common to abundant short and/or stiff crisped hairs in addition to long verrucose hairs.
|[[Potentilla arenosa subsp. arenosa|Potentilla arenosa subsp. arenosa]]
|- id="key-0-1"
|1
|Petioles with sparse or no short and/or soft crisped hairs in addition to long verrucose hairs.
|[[Potentilla arenosa subsp. chamissonis|Potentilla arenosa subsp. chamissonis]]
|}
</div></div><!--

-->{{#Taxon:
name=Potentilla arenosa
|authority=(Turczaninow) Juzepczuk
|rank=species
|parent rank=section
|synonyms=
|basionyms=Potentilla nivea var. arenosa
|family=Rosaceae
|distribution=Alta.;B.C.;Man.;N.W.T.;Nunavut;Que.;Sask.;Yukon;Alaska;Eurasia.
|reference=None
|publication title=in V. L. Komarov et al., Fl. URSS
|publication year=1941
|special status=
|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V9/V9_301.xml
|subfamily=Rosaceae subfam. Rosoideae
|tribe=Rosaceae tribe Potentilleae
|genus=Potentilla
|section=Potentilla sect. Niveae
|species=Potentilla arenosa
}}<!--

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[[Category:Treatment]]
[[Category:Potentilla sect. Niveae]]
[[Category:Revised Since Print]]